tcvn VIETNAMESE STANDARD tcvn 5309 : 2001 Mobile Offshore Units - Rules for classification and construction Classification Hμ néi - 2001
5309 2001 Classification
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t c v n V I E T N A M E S E S T A N D A R D
tcvn 5309 : 2001
Mobile Offshore Units -
Rules for classification and
construction
Classification
Hµ néi - 2001
TCVN 5309:2001
Foreword
TCVN 5309:2001 replaces to TCVN 5309:1991.
TCVN 5309:2001 is edited by Vietnam Register and TCVN/TC8 ''Shipbuilding and Offshore'' Technical
Standard Board, is proposed by Ministry of Transportation and Standard - Measure - Quality General
Department, is promulgated by Ministry of Science, Technology and Environmental.
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TCVN 5309:2001
TABLE OF CONTENT
1. General...............................................................................................................................................7
1.1. Application ....................................................................................................................................7
1.2. Quotaion Standards......................................................................................................................7
1.3. Definitions and explanations .......................................................................................................8
1.3.1. Type of Units...........................................................................................................................8
1.3.2. Modes of Operation ................................................................................................................9
1.3.3. Length of Unit (L) ....................................................................................................................9
1.3.4. Breadth of Unit (B) .................................................................................................................9
1.3.5. Depth of Unit (D) ...................................................................................................................10
1.3.6. Load Line and Designed Maximum Load Line ......................................................................10
1.3.7. Design Water Depth..............................................................................................................10
1.3.8. Light Unit Weight...................................................................................................................10
1.3.9. Design Service Temperature of Materials for Unit ................................................................10
1.3.10. Weathertight..........................................................................................................................11
1.3.11. Watertight .............................................................................................................................11
1.3.12. Downflooding ........................................................................................................................11
1.3.13. Control Station ......................................................................................................................11
1.3.14. Hazardous Area ....................................................................................................................11
1.3.15. Safety Area ...........................................................................................................................11
1.3.16. Enclosed Space....................................................................................................................11
1.3.17. Semi-Enclosed Space...........................................................................................................11
1.3.18. Provisions or Installations for Safety of the Unit....................................................................12
1.3.19. Unit Operating in Restricted Area .........................................................................................12
1.3.20. Unit for Self-Propelled System..............................................................................................12
1.3.21. Semi-constantly positioned unit ............................................................................................12
1.3.22. Constantly positioned unit .....................................................................................................12
1.3.23. Operating Booklet .................................................................................................................13
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TCVN 5309:2001
1.3.24. Air gap:..................................................................................................................................14
1.3.25. Area Exceeding:....................................................................................................................14
1.3.26. Moving: .................................................................................................................................14
2. Character of classification and class notations ...........................................................................14
2.1. Basic class notations..................................................................................................................14
2.2. Main character of classification: hull and machinery ..............................................................14
2.3. Notation of type ...........................................................................................................................14
2.4. Subdivision distinguishing marks and other additional notations.........................................15
2.4.1. Basic design notations ..........................................................................................................15
2.4.2. Service restrictions................................................................................................................15
2.4.3. Equipment and systems notations ........................................................................................15
2.5. Maintenance of class ..................................................................................................................16
2.6. Withdrawal of class and chance character of classification ...................................................16
2.7. Reclassification ...........................................................................................................................17
2.8. Certificate of Classification ........................................................................................................17
2.8.1. Issurance of Classification Certification.................................................................................17
2.8.2. Endorsement of Classification Certificates............................................................................17
2.8.3. Issuance of Provisional Classification Certificates ................................................................17
2.8.4. The duration of a Classification Certificate and Provisional Classification Certificate ...........17
2.8.5. Retention, reissue and return of classification certificate ......................................................17
3. Classification Surveys ....................................................................................................................18
3.1. Classification Surveys during Construction............................................................................18
3.1.1. General .................................................................................................................................18
3.1.2. Submission of Plans and Documents for Approval ...............................................................18
3.1.3. Presence of Surveyor............................................................................................................22
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TCVN 5309:2001
3.1.4. Hydrostatic and Watertight tests ...........................................................................................23
3.1.5. Tests for Machinery Installations and Electrical Installations ................................................24
3.1.6. Sea trials...............................................................................................................................24
3.1.7. Stability Experiments ............................................................................................................24
3.2. Classification Survey of Unit not built under Survey...............................................................24
3.2.1. General .................................................................................................................................24
3.2.2. Tests .....................................................................................................................................25
3.3. Periodical surveys ......................................................................................................................25
3.3.1. General .................................................................................................................................25
3.3.2. Modification of Requirements ...............................................................................................25
3.3.3. Definitions .............................................................................................................................26
3.4. Intervarls of periodical surveys .................................................................................................27
3.4.1. General .................................................................................................................................27
3.4.2. Annual surveys .....................................................................................................................27
3.4.3. Docking surveys....................................................................................................................27
3.4.4. Intermediate surveys.............................................................................................................27
3.4.5. Special surveys.....................................................................................................................28
3.4.6. In-water surveys....................................................................................................................28
3.4.7. Boiler surveys .......................................................................................................................29
3.4.8. Propeller shaft and stern tube shaft surveys.........................................................................30
3.5. Annual surveys ...........................................................................................................................31
3.5.1. Annual surveys for hull, equipment, fire extinguishing systems, etc. ....................................31
3.5.2. Annual survey for Machinery installations and Electrical Installations ..................................33
3.6. Docking surveys .........................................................................................................................38
3.6.1. General .................................................................................................................................38
3.6.2. Requirements for Docking survey .........................................................................................38
3.7. Intermediate Surveys..................................................................................................................39
3.7.1. General .................................................................................................................................39 5
TCVN 5309:2001
3.7.2. Intermediate survey for hull, Equipment, fire extinguishing systems, etc. .............................39
3.8. Special surveys ...........................................................................................................................41
3.8.1. General .................................................................................................................................41
3.8.2. Special surveys for hull, equipment, fire extinguishing systems, etc.....................................41
3.8.3. Special surveys for Machinery Installations and Electrical Installations ................................43
3.9. Boiler and thermal oil heater surveys .......................................................................................50
3.9.1. General .................................................................................................................................50
3.10. Propeller shafts and stern tube shaft surveys......................................................................50
3.10.1. General .................................................................................................................................50
Introduction
Mobile Offshore Units - Rules for classification and construction include:
TCVN 5309 : 2001 Classification
TCVN 5310 : 2001 Hull
TCVN 5311 : 2001 Equipment Arrangement
TCVN 5312 : 2001 Stability
TCVN 5313 : 2001 Subdivision
TCVN 5314 : 2001 Fire protection,detection and extincition
TCVN 5315 : 2001 Machinery Installations
TCVN 5316 : 2001 Electrical Installations
TCVN 5317 : 2001 Materials
TCVN 5318 : 2001 Welding
TCVN 5319 : 2001 Safety Equipment
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TCVN 5309:2001 Vietnamese standard TCVN 5309:2001
Mobile Offshore Units - Rules for classification and
construction
Classification
1. General
1.1. Application
1 These Mobile Offshore Units - Rules for classification and construction (abbreviation is Mobile Unit
Rules) is applied for all self-moving and non self-moving Mobile Offshore Units (abbreviation is Unit)
defined in 1.3.2.
2 These Rules stipulate forced requirements on classification and construction for Units.
3 The technical supervision and classification for various types of Units are to be camed out by Viet nam
Register (VR).
4 Units have to be satisfied requirements in this Rules and another related requirements stated in TCVN
6259:1997.
5 Another requirements in other Rules and technical documents may be applied with acceptance of VR.
1.2. Reference Standards
1 TCVN 6259-1:1997 to TCVN 6259-11:1997 Rules for classification and construction of steel sea-going
ship.
2 Mobile Offshore Units - Rules for classification and construction include:
TCVN 5309 : 2001 Classification
TCVN 5310 : 2001 Hull
TCVN 5311 : 2001 Equipment Arrangement
TCVN 5312 : 2001 Statibility
TCVN 5313 : 2001 Subdivision
TCVN 5314 : 2001 Fire protection,detection and extinciton
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TCVN 5309:2001
TCVN 5315 : 2001 Machinery Installations
TCVN 5316 : 2001 Electrical Installations
TCVN 5317 : 2001 Materials
TCVN 5318 : 2001 Welding
TCVN 5319 : 2001 Safety Equipment
1.3. Definitions and explanations
The following definitions and explanations are valid in Rules on 1.2-2.
1.3.1. Type of Units
1 Self-elevating unit : Self-elevating unit is a unit having hulls with sufficient buoyancy to safely transport
the unit to the desired location ,affter which the hull is raised to a predetermined elevation above the sea
surface on its legs, which are supported by the sea bed. Equipment and supplies may be transported on
the unit ,or may be added to the unit in its elevated position . The legs of such unit may penetrate the sea
bed , may be fiited with enlarged sections or footings to reduce penetration , or may be attached to
bottom pads or mats.
2 Column stabilized unit : Column stabilized unit is a unit which depends upon the buoyancy of widely
spaced columns for floatation and stability for for all afloat modes of operation or in the raising or
lowering of the unit, as may be applicable. The colums are connected at their top to an upper structure
supporting the equipment. Lower hulls or footings may be provided at the bottom of the the columns for
additional buoyancy or to provide sufficient area to support the unit on the sea bed. Bracing members of
tubular or structural sections may be used to connect the columns, lower hulls or footings and to support
the upper structure. Operations may be carried out in the floating condition, in which condition the unit is
described as a semi-submersible, or when supported by the sea bed, in which condition the unit is
described as a submersible. A semi-submersible unit may be designed to operate either floating or
supported by the sea bed, provided each tupe of operation has been found to be satisfactory.
(1) Submersible type Units (Submersible Units): Column stabilized unit, bases on sea-bed during
operation
(2) Semi-Submersible type Units (Semi-Submersible Units): Column stabilized unit, floating during
operation
3 Ship type unit : Ship type unit is a seagoing ship-shaped unit having a displacement type hull or hulls, of
the single, catamaran or trimaran type, which has been designed or converted for operations in the
floating condition. The unit of this type has propelling machinery.
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TCVN 5309:2001
4 Barge type unit : Barge type unit is a seagoing unit having a displacement type hull or hulls. which has
been designed or converted for operations in the floating condition. The unit of this type has no propelling
machinery.
1.3.2. Modes of Operation
A mode of operation is a condition or manner in which a unit may operate or function while on location or
in transit, In the requirements of this Part, the approved modes of operation of a unit are defined as follows:
1 Operating condition
Operating condition is a condition wherein a unit is on location for purposes of operations. and combined
environmental and operational loadings are within the appropriate design limits established for such
operations. The unit may be either afloat or supported by the sea bed, as applicable.
2 Severe storm condition
Severe storm condition is a condition during which a unit may be subjected to the severest environmental
loadings for which the unit is designed. Operations are assumed to have been discontinued due to the
severity of the environmental loadings. The unit may be either afloat or supported by the sea bed, as
applicable.
3 Transit condition
Transit condition is a condition wherein a unit is moving from one georaphical location to another without
any operation of its purpose.
4 Temporary mooring condition
Temporary mooring condition is a condition wherein a unit is temporary moored in the afloat condition.
1.3.3. Length of Unit (L)
1 For self-elevating units and barge type units. length is the distance in metres on the summer load
line.between the insides of shell platings at the fore and after ends.
2 For column stabilized units. length is the maximum distance in metres between the fore and after ends
of the primary hull structure which is projected to the centre line of the hull.
3 For ship type units. length is the distance in metres on the summer load line. from the fore side of the
sterm to the centre of the rudder stock. or 96 % of the length on the summer load line. whichever is
greater. Where a ship does not have a rudder. length is 96 % of the length on the summer load line.
1.3.4. Breadth of Unit (B)
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TCVN 5309:2001
1 For column stabilized units, breadth is the horizontal distance in metres measured perpendicularly to the
longitudinal centre line at the broadest part of the primary hull structure.
2 For self-elevating units, ship type units and barge type units, breadth is the horizontal distance in metres
beetween outsides of frames at the broadest part of the hull.
1.3.5. Depth of Unit (D)
1 For column stabilized units, depth is the vertical distance in metres from the top of bottom plating of the
lower hull or footing to the top of beam of the uppermost continuous deck at side measured at the middle
of L.
2 For self-elevating units. ship-type units and barge type units, depth is the vertical distance in metres
from the top of bottom plating to the top of beam of the uppermost continuous deck at side measured at
the middle of L
1.3.6. Load Line and Designed Maximum Load Line
1 Load line is the water line corresponding to each freeboard assigned in accordance with the provisions
in TCVN 6259 -11:1997,and the provisions of this Standard.
2 Designed maximum load line is the water line corresponding to the designed full load condition.
1.3.7. Design Water Depth
Design water depth is the vertical distance in metres from the sea bed to the mean low water level plus
the height of astronomical and storm tides.
1.3.8. Light Unit Weight
Light Unit weight is the weight of the complete unit in tons with all its permanently installed
machinery,equipment and outfit. including permanent ballast, spare parts normally retained on board,
and liquides in machinery and piping to their normal working levels, but does not include cargo, liquids in
storage or reserve supply tanks, items of consumable or variable loads,any allowance for stores or crew
and their effects.
1.3.9. Design Service Temperature of Materials for Unit
Design service temperature of materials is the lowest of the average daily atmospheric temperatures,
based on meteorological data, for any anticipated area of operation.If data giving the lowest daily
average temperatrure are not available. the lowest monthly average temperature may be used.
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TCVN 5309:2001
1.3.10. Weathertight
Weathertight means that in any sea conditions water will not penetrate into the unit.
1.3.11. Watertight
Watertight means that the capability of preventing the passage of water through the structure in any
direction under a head of water for which the surrounding structure is designed.
1.3.12. Downflooding
Downflooding means any flooding of the interior of any part of the buoyant structure of a unit through
openings which cannot be closed watertight or weathertight, as appropriate, or which are required for
operatinnal reasons to be left open.
1.3.13. Control Station
Control station is a space where radio equipment, main navigational equipment or emergency source of
power is located and control panels for posture or position control equipment, leg elevation control
equipment, central fire detection or central fire alarm devices are installed.
1.3.14. Hazardous Area
Hazardous areas are an those areas where, due to the possible presence of a flammable atmosphere
arising from the drilling operations, the use of machinery or electrical equipment without proper
consideration may lead to fire hazard or explosion. For mobile offshore drilling units. hazardous areas
are subdivided into Zones 0, 1 and 2. the definitions of each category being as follows:
1 Zone 0 is an area in which an explosive gas-air mixture is continuously present or present for long periods.
2 Zone 1 is an area in which an explosive gas-air mixture is likely to occur in normal operating conditions,
3 Zone 2 is an area in which an explosive gas-air mixture is not likely to occur. and if it occurs, it win only
exist for a short time.
1.3.15. Safety Area
Safety area is a non-hazardous areas which areas are other than hazardous areas.
1.3.16. Enclosed Space
An enclosed space is considered to be a space bounded by bulkheads and decks which may have
doors, windows or other similar openings.
1.3.17. Semi-Enclosed Space
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TCVN 5309:2001
A semi-enclosed location is considered lo be a location where natural conditions of venlilation are notably
different from those on open decks due lo the presence of structures such as roofs, windbreaks and
bulkheads and which are so arranged -that the dispersion of gas may not occur.
1.3.18. Provisions or Installations for Safety of the Unit
Provisions or Installation for safety of the units are those listed in the following 1 to 10 :
1 Auxualiary machineries classified into the manoeurvring and the safety which are specified in 1.1.6,
chapter 1, TCVN 6259-3:1997.
2 Mooring systems
3 Jacking systems
4 Lighting systems
5 Internal communication systems
6 Fire extinguishing systems
7 Radio installation
8 Navigational systems
9 Feed water systems and burning systems for boilers which supply steam to any one of the systems
prescribed in (1) to (8)
10 Other systems deemed necessary by the VR.
1.3.19. Unit Operating in Restricted Area
The unit operating in restricted area is a unit whose navigation route or operating area is limited to the
coastal waters, smooth water or equivalent waters.
1.3.20. Unit for Self-Propelled System
The unit for self-propelled system is the unit which are to undertake self-propelled passages without
external assistance.
1.3.21. Semi-constantly positioned unit
Semi-constantly positioned unit is the one which is positioned at the site in over 36 months .
1.3.22. Constantly positioned unit
The constantly positioned unit is the one which is positioned at site in over 30 days .
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TCVN 5309:2001
1.3.23. Operating Booklet
An Operating Booklet is to include the following information, as applicable to the particular unit. so as to
provide suitable guidance to the operating personnel with regard to safe operation of the unit:
1 General description of the unit;
2 Pertinent data for each approved mode of operation, including design and variable loading,
environmental conditions, draught, etc.;
3 The Iowest temperatures of atmosphere and sea water assumed at the design stage;
4 General arrangement showing watertight compartments,closures, vents, allowable deck loadings,etc.;
5 Hydrostatic curves or equivalent data;
6 Capacity plan showing capacities of tanks, centres of gravity, free surface corrections, etc.;
7 Instructions for operation, including precautions to be taken in adverse weather, changing mode of
operation. any inherent limitations of operation, etc.;
8 Plans and description of the baltast system and instructions for ballasting. If permanent ballast is to be
used, the weight, location and substance used are to be clearly indicated;
9 Piping diagrams of fuel oil transfer systems;
10 Hazardous areas plan;
11 Fire control plan;
12 Arrangement of life-saving appliances to gether with escape routes;
13 Light unit data based on the results of an inclining experiment,etc.;
14 Stability information
15 Representative examples of loading conditions for each approved mode of operation together with
means for evaluation of other loading conditions;
16 Diagrams of main and auxiliary wiring systems;
17 Details of emergency shut-down procedures for electrical equipment;
18 Identification of the helicopter assumed in the design of the helicopter deck;
19 Instruction for operation of mooring systems;
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TCVN 5309:2001
20 Instruction for operation of dynamic positioning system;
21 Other instructions deemed necessary by the VR .
1.3.24. Air gap:
Air gap is a measure between lowest part of deck to mean sea level with mentioning astronomic and
storm tide.
1.3.25. Area Exceeding:
Area Exceeding is a moving out of specified operating area.
1.3.26. Moving:
Moving is a transit of units in floating state to specified location in its operating area.
2. Character of classification and class notations
All units found to sastify the standard in design, fabrication, survey in compliance with the rules will be
given a class notations and the main particulars of class for the unit will be entered in the Register Book.
2.1. Basic class notations
VR : This distinguishing mark will be assigned to units in compliance with the Rules
∗ : Units constructed under VR surveys.
∗ : Units constructed under the other classification society recorgnized or / and authorized by VR.
(∗) : Units constructed without surveys or under surveys of the other classification Society without
recorgnized by VR .
2.2. Main character of classification: hull and machinery
The class notations of the hull and machinery are to be given in according to the requipments stated in 2
and 3, 2.1.3, chapter 2, part 1-A, TCVN 6259-1:1997.
2.3. Notation of type
1 The unit having structures in similar with those which defined in 1.3.2 of these rules and in according to
the related requirements of the TCVN 5309:2001 ÷ TCVN 5319:2001 (see 1.2-2) and TCVN 6259:1997,
the following will be added in depended on the class notationtype of the unit
Self-elevating Unit
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TCVN 5309:2001
Semi-submersible Unit
Submersible Unit
Sip type Unit
Barge type Unit
2 When unit structures in principles are different from those which defined in 1.3.2 of the rules the unit
type and characters added into the class notation will be considered by VR in case by case .
2.4. Subdivision distinguishing marks and other additional notations
Subdivision distinguishing marks and other additional notations for unit are specified in regulation 4,
2.1.3, chapter 2, part 1-A, TCVN 6259-1:1997 with the following notations :
2.4.1. Basic design notations
1 The unit used in according to the relevant requirements of TCVN 5309:2001 ÷ TCVN 5319:2001 (refer to
1.2-2) and TCVN 6259:1997, the following additional class notation will be given :
Accommodation unit
Fire fighter unit
Crane unit
Drilling unit
Pipe laying unit
Production unit
Support unit
2 In cases where the unit used other than listed in -1 the additional notation will be added in case by case
by VR .
2.4.2. Service restrictions
1 If the unit is operated in a particular location and when maximum loads incluced by wave, wind, ice and
current in that location have been considered then the location, loads and ice reinforcement shall be
stated in classification certificate .
2.4.3. Equipment and systems notations
1 Units having special equipment or systems found to satisfy relevant requirements will be given
corresponding additional class :
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TCVN 5309:2001
HLDK ( helicopterdeck )
CRANE ( crane )
DSV ( diving system)
DPS ( dinamic positioning system)
POSMOOR ( Moring system for posioning of unit)
PROD ( Production equipment)
DRILL ( drilling rig)
2 Units having one or more special equipment or/and systems different to above notations specified in -1
will be considered case by case by VR for additional special feature notations .
2.5. Maintenance of class
1 The units which have been classed with VR will maintain the assigned class and character until, as a
result of surveys inspections or test which have been carried out, the units are found to be in fully
compliance with the relevant requirements of this regulations .
1 Any damage or defect which may affect the class assigned is to be reported to VR without delay and an
application for surveys is to be submitted by Owner/operator or their representative .
2.6. Withdrawal of class and chance character of classification
1 The class assigned to a unit by VR will be withdrawal under any one of the following conditions:
(1) VR recognized that the unit can no longer be used ;
(2) If it is not submitted to surveys for maintenance of class as required at the proper time which is
noted in the Certificate;
(3) When the Owner fails to repair such damages and defects that affect the class of the unit in
accordance with VR requirements;
(4) When requested by the Owner of the unit;
(5) Survey fees are not paid by the owner .
2 VR will change or wihdraw class notation stated in Classification certificate if there is change or violation
of principle conditions which are basis for classification of unit .
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TCVN 5309:2001
2.7. Reclassification
1 When reclassification or class reinstatement is desired for a unit for which the class previously was
assigned by VR and has been withdrawn, a special survey for reclassification, appropriate to the age
and technical conditions of the unit, will be carried out by VR .
2 If, at such survey, the unit is found that its conditions are fully compliance with the regulations, VR may
reinstate its original class or assign such other class as may be deemed necessary .
2.8. Certificate of Classification
2.8.1. Issurance of Classification Certification
Upon the completion of the construction survey, classification survey for first entry of reclassification
survey of a unit, if it is found that the unit complies fully with the Regulations, a classification certificate will
be issued to the applicant by VR .
2.8.2. Endorsement of Classification Certificates
The Classification Certificate for Units issued by VR will continue to be valid, provided that the units are
subjected to the annual surveys for maintenance of class as prescribed of the Regulations and results of the
surveys are found satisfactory to the requirements of the Regulations.
2.8.3. Issuance of Provisional Classification Certificates
Pending the issuance of the Classification Certificate, where a result of surveys is found that the unit is in
a fit an efficient condition and in compliance with the regulations, VR may issue a corresponding Provisional
Classification Certificates to enable the unit to be put into service in the shortest possible period of time .
2.8.4. The duration of a Classification Certificate and Provisional Classification Certificate
1 The duration of a Classification Certificate and Provisional Classification Certificate compliance with
2.4.2 (1) and (2), Part 1-A, TCVN 6259-1:1997.
2 The full term classification certificate and provisional classification certificate is invalid when the class
has been withdrawn as specified in 2.6-1.
3 The certificate of classification of the unit is invalid if not satisfied the requirements in 2.8.2.
2.8.5. Retention, reissue and return of classification certificate
Retention, reissue and return of classification certificate are to be in accordance with the requirements in
2.4.3 TCVN 6259-1: 1997.
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TCVN 5309:2001
3. Classification Surveys
3.1. Classification Surveys during Construction
3.1.1. General
In the Classification survey during construction, surveys are to be carried out on hull construction,
equipment, machinery, construction of fire protection, means of escape, fire extinguishing arrangements,
electrical installation, stability and load line and positioning systems in order to ascertain that they meet the
relevant requirements of VR.
3.1.2. Submission of Plans and Documents for Approval
1 In the Classification Survey during construction, plans and documents as listed in the following (1) and
(2) are to be submitted for the approval by the VR before the work is commenced
(1) Hull
(a) For Ship type unit and barge type unit
1) General arrangement;
2) Transverse sections showing scantlings;
3) Longitudinal sections showing scantlings;
4) Shell expansion ;
5) Construction profile;
6) Construction of frames, pillars and longitudinal girders under deck;
7) Construction of single bottoms and double bottoms and deck construction including
details of helicopter deck, openings such as hatchways, wells, etc.;
8) Construction of watertight and oiltight bulkhead and deep tanks indicating the
heights of the highest parts of tank and the tops of overflow pipes;
9) Construction of stem, sternframe, propeller post and rudder ;
10) Construction of superstructures end deckhouses including their end bulkhead;
11) Arrangements to resist painting of both peaks and their vicinity;
12) Seatings of engines, boilers, thrust, blocks, plummer blocks, dynamos and other
essentially important auxiliary machineries;
13) Construction of machinery rooms, pump rooms and motor rooms including their
casings and shaft tunnels ;
14) Masts, mast houses and construction of cargo handling machinery and gear and
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TCVN 5309:2001
winch platforms ;
15) Pumping arrangements ;
16) Arrangements and construction of watertight doors, hatchways, side scuttles and
closing appliances of openings ;
17) Construction for fire protection with materials used in the construction of
superstructures, bulkheads, decks, deckhouses, trunks, stairways, deck coverings,
etc. and arrangements of closing appliances of openings and means of escape) ;
18) Fire extinguishing arrangements;
19) Details of inspection facilities ;
20) Details of welding procedures ;
21) Details of painting and corrosion control procedures ;
22) Details of maintenance and inspection procedures ;
23) Stability information booklet ;
24) Loading manual, where the loading manual is to be provided in accordance with the
requirement of 4.6.1-2 TCVN 5310-2001 ;
25) Temporary mooring arrangements, towing arrangements and arrangements of
positionings systems for a long period of time ;
26) Temporary mooring arrangements and towing arrangements ;
27) Arrangements and construction of positioning systems ;
28) Plan indicating design loadings for all decks ;
29) Details of docking plan and in-water inspection procedures ;
(b) For self-elevating unit:
Construction of all legs, leg connections to bottom mats or spud cans, leg tank and leg
jacking or other elevating systems, in addition to the relevant plans or documents
specified in (a)
(c) For column stabilized unit
Construction of all columns, lower hull, upper hull, bracings, footings, in addition to the
relevant plans or documents specified in (a) .
(d) Other plans and/or documents deemed necessary by the VR .
(2) Machinery installations and electrical installations:
(a) Machinery arrangement of machinery spaces, pump rooms, motor rooms and diagrams
for internal communication systems including a diagram for an engineers' alarm systems;
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TCVN 5309:2001
(b) For machinery installations used for the system or the equipment essential for the safety
of the unit or for the propulsion of the unit ( only applicable to the unit which has the main
propulsion machinery) : plans and documents required in the relevant in TCVN 6259-
3:1997;
(c) For machinery installations used solely for the operation which is the purpose of the unit:
plans and documents specified in 2.1.2(1)(g), (i) and (k), TCVN 6259-3:1997 and Chapter
9 and 10 TCVN 6259-3:1997, and piping diagram for oil including fuel oil, lubricating oil,
hydraulic oil, among the piping diagrams specified in Chapter 13, TCVN 6259-3:1997
(d) Particulars and arrangements of detection systems, monitoring systems and alarm
systems ;
(e) For self-elevating unit ;
Construction and control diagrams of jacking system ;
(f) For the units provided with the dynamic positioning system ;
Construction and control diagrams of dynamic positioning system ;
(g) For the units which are integrated as one system by multiple number of the units with the
same construction, dimentions and arrangements ;
Testing procedures for electrical provisions or installations ;
(h) Plans and documents for electrical installations specified in 1.1.6 TCVN 6259-4:1997;
(i) Other plans and/or documents deemed necessary by the VR ;
2 Plans and documents specified in -1 (1)(a) to (c) are to indicate in detailthe quality of materials used,
scantlings and arrangements of structural members, their attachments, clearance between the bottom of
boilers and the top of floors, and other particulars necessary for examination of proposed constructions. .
3 In the Classification Survey during construction, plans and documents as listed in the following are to be
submitted for reference :
(1) Specifications ;
(2) Method and calculation sheets of structural analysis for relevant loading condition;
(3) Data or documents on environmental condition used for determination to design loads, which
indicates in detail the measurement' data of the past in service area or navigation area such as
winds, wave etc., the effects of wave breakers, methods of towing and so on, and calculation
method of total external force and moment due to winds, waves, currents and tidal currents,
reaction of mooring or positioning systems and other loads ;
(4) Documents on the effect of loading, stability and projected area due to icing or snowing, if any ;
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TCVN 5309:2001
(5) Calculation sheets for intact and damage stability at all conditions ;
(6) Relating to requirements of (3) to (5), documents on wherethe loads and stability are
determined using appropriate model tests or computing methods are carried out ;
(7) Calculation of significant operational loads from derrick, other equipment, etc. on the supporting
structure ;
(8) For self-elevating unit, caculations substantiating adequacy of structure to transmit forces
between legs and hull through the jacking or other elevating systems ;
(9) For the units which are embedded on the sea bottom, calculation of the unit's ability to resist
overturning ;
(10) Lines ;
(11) Cross curves of stability ;
(12) Curves of righting moment and wind heeling moment ;
(13) Capacity plans and sounding tables of tanks ;
(14) Method and location of non-destructive inspection and procedures of thickness measurements ;
(15) Plans indicating arrangement of watertight compartments, openings, their closing, their closing
applicances, etc. necessary for calculation of stability ;
(16) For machinery installations used for safety of the unit or for the propulsion of the unit( only
applicable to the unit which has the main propulsion machinery) : plans and documents required
in the relevant chapter in TCVN 6259-3;
(17) For machinery installations used solely for operation which is for the purpose of the unit : plans
and documents indicating safety devices of machinery installations and those specified in
Chapter 9 and 10, TCVN 6259-3;
(18) Plans and documents for electrical installation specified in 1.1.6, TCVN 6259-4;
(19) Operating booklet ;
(20) Calculation sheets on mooring systems or dynamic positioning systems ;
(21) For large sized storage unit, hydraulic test procedure, confirmatory test procedure for hull and
evaluation sheets of rapture hatches and periodical inspection peocedure including self
checking of rapture hatches ;
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TCVN 5309:2001
(22) Procedures of sea trial and stability experiments, testing procedure of the dynamic posioning
systems, in case where the unit is provided with a dynamic positioning system ;
(23) Other plans and/or documents deemed necessary by the VR .
4 Notwithstanding the requirements in -1 to -3 submission of the plans and documents specified in -1 to -3
may be omitted partially in accordansce with the provisions specified otherwise by the VR and in case
where a unit or machinery is intended to be built at the same manufacturer's work based on the plans
and documents which have been approved for other units .
5 Plans and documents may be subject to examination by the VR prior to the submission for the
Classification of the unit in accordance with the provisions specified by the VR.
3.1.3. Presence of Surveyor
1 The presence of the Surveyor is required at the following stages of the work in relation to hull and
equipment:
(1) When the material tests prescribed in Part 7-A and Part 7-B TCVN 6259-7:1997 are carried out.
(2) When the materials or parts manufactured away from the site are being applied to the unit
concerned;
(3) When the tests of welding prescribed in Part TCVN 6259-6:1997 are carried out;
(4) When designated by the Society during shop work or sub-assembly ;
(5) When each block is assembled;
(6) When hydrostatic tests, watertight tests and non-destructive tests are caried out;
(7) When hull is completed;
(8) When performance tests are carried out on closing appliances of openings, remote control
devices, steering gears anchoring and mooring arrangements, piping, etc. ;
(9) When installing of rudder, profiling of keel line, measurement of principal dimensions,
measurement of deflection of hull, etc. are carried out;
(10) When the units are marked with the load lines in accordance with the equirements in TCVN
6259-11:1997;
(11) When mooring systems are fitted on board and performance tests are carried out ;
(12) When sea trials are carried out;
22
TCVN 5309:2001
(13) When installing of fire extinguishing arrangements, and when the performance tests are carried
out ;
(14) When stability experiments are carried out;
(15) For column stabilized units, when the draught scales are fitted ;
(16) When deemed necessary by the VR;
2 The presence of the Surveyor is required at the following stages of the work in relation to machinery
installations and electrical installations:
(1) When the tests of materials of main parts machinery prescibed in Part 7-A TCVN 6259-7:1997
are carried out ;
(2) When tests prescibed in 3.1.5 are carried out ;
(3) When the materials are applied to the parts and the parts are installated on board ;
(4) When machining of the main parts is finished and, if necessary, at a proper time during
machining ;
(5) In case of welded construction, before welding is commenced and when it is completed ;
(6) When shop trials are carried out ;
(7) When important machinery installations and electrical installations are installed on board ;
(8) When performance tests are carried out on, remote control devices of closing appliances,
remote control devices, steering gears, mooring arrangements, piping, etc.;
(9) When each component consisting of a dynamic positioning systemis fitted on board and
ferformance tests of each component are carried out ;
(10) When sea trials are carried out;
(11) When deemed necessary by the VR;
3 The requirements specified in -1 and -2 may be modified having regard to the actual status of facilities,
technical abilities and quality control at the work, except the case of sea trials and stability experiments.
3.1.4. Hydrostatic and Watertight tests
1 Hydrostatic and watertight tests in the Classification Survey during construction are to be in accordance
with the requirements in 2.1.6, Chapter 2, Part 1-B General , TCVN 6259-1:1997 .
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TCVN 5309:2001
2 Notwithstanding the requirement in -1, where considering the design condition and these are approved
by the VR, hydrostatic and watertight tests are to be appropriate to the VR .
3.1.5. Tests for Machinery Installations and Electrical Installations
Tests for machinery installations and electrical installations are to be in accordance with the requirements
in TCVN 5315-2001 vµ TCVN 5316-2001 .
3.1.6. Sea trials
For the units provided with main propulsion machinery, following tests corresponding to the types of the
units are to be carried out in addition to sea trials required in 2.3.2, Chapter 2, Part 1-B TCVN 6259-1:1997,
1 For self-elevating units, elevating and lowering test of legs and decks and funtion tests of their safety
devices, and in case where legs are not provided with bottom mats, pre-loading tests on each leg to the
load as near as possible to that considered in the strength caculation specified in TCVN 5310:2001;
2 For column stabilized units, function test of ballasting system ;
3 For the unit provided with a dynamic positioning system, experiments are to be carried out in
accordance with test procedure specified in 3.1.2 -3 (22) ;
3.1.7. Stability Experiments
1 In the Classification survey, stability experiments of a unit are to be carried out upon completion of the
unit. And a stability information booklet, which is to be prepared on the basis of the particulars of stability
determined by results of stability experiments and to be approved by the VR, is to be provided on board.
2 The stability experiments of an individual unit may be dispensed with, provided that available stability
data are obtained from the stability experiments of a similar unit or other adequate means and a special
approval is given by the VR. However, stability experiments for a column stabilized unit are to be carried
out even through the stability data is available from a similar unit
3.2. Classification Survey of Unit not built under Survey
3.2.1. General
1 In the Classification Survey of Unit not built under VR's survey, the actual scantlings of main parts of the
unit are to be measurd in addition to such examination of the hull and equipment, machinery
installations, construction of fire protection and detection, means of escape, fire extinguishing
arrangements, electrical instalations, stability and load lines and positioning systems as required for the
special survey corresponding to the units' age in order to ascertain that they meet the relevant
requirements in the Rules.
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TCVN 5309:2001
2 The units intended to be surveyed in accordance with -1, necessary plans documents are required for
the classification survey during construction are to be submitted for the approval by the VR .
3.2.2. Tests
1 Hydrostatic and watertight tests are to be carried out in accordance with the requirements in 3.1.4.
2 Sea trials are to be carried out in accordance with the requirements in 3.1.6. However, the sea trials may
be dispensed with provided that sufficient information based on previous tests is available and neither
alterations nor repairs affecting the sea trials have been made after the previous trials .
3 The stability experiments are to be carried out in accordance with the requirements in 3.1.7. Where
sufficient information based on previous stability experiments is available and neither alteration nor
repair affecting the stability has been made after previous experiments, the stability experiments of the
unit may be dispensed with. However, the stability experiments for column stabilized unit which may be
required where deemed necessary by the VR even though the stability data is available from a similar
units .
3.3. Periodical surveys
3.3.1. General
1 All units classed with the VR are to be subjected to the following Periodical surveys :
(1) Annual surveys ;
(2) Docking Surveys;
(3) Intermediate surveys;
(4) Special surveys;
(5) Boiler surveys and Thermal oil Heater survey;
(6) Propeller shaft and stern tube shaft survey .
2 All examinations and tests in accordance with the requirements in 3.5 to 3.10 are to be carried out to the
satisfaction of the Surveyor.
3.3.2. Modification of Requirements
At the Periodical Surveys ,the surveyor may modify the requirements for Periodical Surveys specified in
3.5 to 3.9 having regard to the size, service engaged, age, construction, results of last surveys and actual
condition of the unit.
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TCVN 5309:2001
3.3.3. Definitions
The definitions of terms in the following -1 to -9 are to be in accordance with 3 :
1 " Ballast tank " : is a tank which is used for water ballast and includes segregated balast tanks ,side
balast tanks, balast double bottom spaces, top-side tanks, hopper side tanks and peak tanks. A tank
which is used for both cargo and ballast will be treated as a ballast tank when substantial corrosion has
been found in that tank.
2 "Close-up survey" : is a survey where the details of structural components are within the close visual
inspection range of the surveyor,i.e. preferably within reach of hand .
3 "Longitudinal members in the transverse section": include all longitudinal members such as plating,
longitudinals and girders at the deck, side, bottom, inner bottom and longitudinal bulkheads in the
considered transverse section.
4 "Representative tanks" : are those which are expected to reflect the condition of other tanks similar
types and service and service and with similar corrosion prevention systems. When selecting
representative tanks account should be taken of the service and repair history on board and identifiable
critical and or suspect areas.
5 "Suspect areas" : are locations showing substantial corrosion and/or are considered by the Surveyor to
be prone to rapid wastage.
6 "Substantial corrosion" : is such an extent of corrosion that that assessment of corosion pattern indicates
a wastage in excess of 75% of allowable margins, but within acceptable limits.
7 "Corrosion prevention system" : is normally considered either:
(1) A full hard coating supplemented by anodes;
(2) A full hard coating.
8 Coating condition is defined as follows :
(1) "Good " : Condition with only minor spot rusting ;
(2) "Fair " : condition with local breakdown at edges of stiffeners and weld connections and /or
light rusting over 20% or more of areas under consideration, but less than as defined for poor
condition;
(3) "Poor " : condition with general breakdown of coating over 20% or more of areas or hard
scale a 10% or more of areas under consideration.
9 "Oil " : is petroleum including crude oil , heavy fuel oil , lubricating oil, light oil kerosene, gas oil, and
26
TCVN 5309:2001
others prescribed by the relevant laws and regulations.
3.4. Intervarls of periodical surveys
3.4.1. General
1 A periodical survey, annual, intermediate or special, is to be considered as completed when the relevalt
periodical surveys both for hull and for machinery have been completed, unless the special
arrangement is made with the VR .
2 Except as amended at the discretion of the VR, the intervals of Periodical Surveys are specified in 3.4.2
to 3.4.7 following.
3 Class Periodical Surveys should, whenever practicable, be held concurrently with statutory periodical
surveys or inspections .
4 Where both Annual Survey and Intermediate Survey are due at a time, only Intermediate Survey is to be
carried out .
3.4.2. Annual surveys
Annual surveys is to be carried out within three months either way of each anniversary date of the date
crediting a Classification Survey or the previous Special Survey .
3.4.3. Docking surveys
1 Survey intervals:
A Docking survey for the units except a large sized storage unit are to be carried out two times in any 5
year period, with an interval not exceeding two and half years be tween Docking surveys
2 Extension of Docking surveys:
An extension of Docking surveys may be granted for a period not exceeding 6 months from the due date,
when requested by the owner. In any case, however, the docking survey shall not be extended beyond a
date which falls either at 3 years from the last docking survey or at 5 years from the penultimate docking
survey which ever comes earlier .
3 Notwithstanding the requirements in -1 and -2 , Docking surveys for the units which are embedded on
the sea bottom semi-permanently, are to be carried out at the date subject to the VR .
3.4.4. Intermediate surveys
Intermediate Surveys are to be carried out on all units instead of the second or third Annual Survey after
completion of Classification Survey and Special Survey .
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TCVN 5309:2001
3.4.5. Special surveys
1 Survey intervals
Special Surveys are to be carried out at 5-yearly interval. The first Special Survey is to be completed
within 5 year from the date of build or date of Special Survey for classification and thereafter 5 years from
the date of completion of the previous Special Survey .
2 Commencement of special surveys
The Special Survey may be commenced at the 4th annual Survey after Clasification Survey or previous
Special Survey and be progressed during the succeeding year with view to completion by the 5th
anniversary date. As part of the preparation for the Special Survey, the thickness measurement should be
dealt with, so far as practical in connection with the 4th Annual Survey.
3 Premature commencemnt of Special survey
Special surveys which are commenced prior to the date are not to extend over a period greater than two
months, except with the priod approval of the VR .
4 Completion of special survey
When a Special survey is not completely carried out one time, the date of completion of the Special
Survey will be the date at which the principal part of thr requipments is complied with.
5 Continuous surveys.
(1) At the request of Owners, and after approval of the proposed arrangements by the VR a system
of Continuous Survey may be undertaken where by the Special survey requirements are carried
out in rotation to complete all the requirements of the particular Special Survey within five years
and interval of consecutive surveys of each part or item is not toexceed five years.
(2) If any defects are found during the surveys, further parts or items are to be opened up and
examined as considered necessary by the Surveyor, and the defects are to be repaired to his
satisfaction.
(3) Where some units of machinary are opened up and examined by the chief engineer as normal
routine for maintenance at ports where the surveyor is not available or at sea, the opened-up-
inspection of the units, at the request of Owners, under certain conditions, may be dispensed
with at the discretion of the surveyor subject to a confirmatory survey at the next port of call
where the surveyor is available .
3.4.6. In-water surveys
1 VR will accept in-water surveys in lieu of any one of the two dockings required in a five year period on
28
TCVN 5309:2001
units where an IWS notation is assigned .
2 VR may accept in-water surveys in lieu of any one of the two dockings required in a five year period on
units where suitable protection is applied to the underwater portion of the hull. If requested, an IWS class
notation may be assigned upon satisfactory completion of the survey, provided that the application
requirements of VR rules are complied with.
3 The in-water survey is to provide the information normally obtained from the docking survey, so far as is
practicable .
4 Proposals for in-water surveys are to be submitted in advance of the survey being required so that
satisfactory arrangements can be acceptable .
5 The in-water survey is to be carried out at agreed geographical location under the surveillance of a VR
surveyor, with the unit at a suitable draught in sheltered waters; the in-water visibility is to be good and
the hull bellow the waterline is to be clean. The surveyor is to be sastisfied that the method of pictorial
presentation is satisfactory. There is to be good two way communication between the surveyor and the
diver.
6 Diving and in-water survey operation are to be carried out by firms recognized by VR.
7 If the in-water survey reveals damage or deterioration that requires early attention, the surveyor may
require that the unit be dry-docked in order that a fuller survey can be undertaken and necessary work
carried out .
8 Where a unit has an IWS notation, the conditions of the high resistant paint is to be confirmed at each
dry-docking in order that the IWS notation can be maintained .
3.4.7. Boiler surveys
1 Survey intervals
(1) Water tube boilers used for propulsion including double evaporation boilers are to be surveyed
internally and externally at 2.5 year intervals, except for ships with single main boiler, where
surveys are to be carried out at 2.5 year intervals until they are 7.5 years old, and subsequently
annually .
(2) All other boilers of essential service, boi;ers of non-essential service having working pressure
exceeding 0.35 MPa and heating surface excceding 4,5 m2, exhaust gas boilers, economizers,
thermal oil heaters and steam generators are to be surveyed internally and externally at 2,5
yearly intervals .
(3) Notwithstanding the requirements in -1 and -2, certain types of boilers, when the VR deems it
29
TCVN 5309:2001
necessary, may be required to be surveyed internally and externally at yearly intervals .
(4) General inspection of boilers including confirmation of their safety devices is to be carried out at
yearly intervas in the course of annual survey of the unit (see 3.7.1(6) TCVN 6259-1:1997).
(5) Notwithstanding the requirements in -1 and -2, an extension of boiler survey may be granted for
a period not exceeding 6 months from the due date, when requested by the Owners, subject to
the survey for the extension .
3.4.8. Propeller shaft and stern tube shaft surveys
1 Ordinary surveys are to be carried out at intervals specified below:
(1) Propeller shaft kind 1 specified in 1.2.39 Part 1-A TCVN 6259-1:1997, are to be surveyed at
least once every four years for units fitted with water-lubricated stern tube bearings ( Which
include shaft bracket bearings, the same being referred to hereinafter in this part) and five years
for units fitted with oil-lubricated stern tube bearings .
(2) Propeller shaft kind 2 specified in 1.2.39 Part 1-A TCVN 6259-1:1997, are to be surveyed at
least once every two and a half years. Where, however, the part of the construction of the shaft
in the stern tube bearing corresponds to the shaft kind 1 and the construction of the shaft
between the stern tube and the shaft bracket bearing corresponds to the shaft kind 2, the shaft
may be surveyed at the intervals specified in -1(1) , on condition that the part of the shaft which
corresponds to the shaft kind 2 is surveyed at least once every two and half years .
2 Notwithstanding the requirements in -1(1) , Ordinary surveys for propeller shaft kind 1A and stern tube
shaft kind 1A, propeller shaft kind 1B and stern tube shaft kind 1B, and propeller shaft kind 1C may be
postponned for not more than the period given in following Table from the date of the postponement
survey prescribed in 3.11.2-2 TCVN 6259-1:1997 provided that the survey is carried out on the due date
of the Ordinary Survey .
Table 3.4.8 Postponement period
No Kind of postponement Survey
Kind of shafts
Postponement
Survey kind A
Postponement
Survey kind B
Postponement
Survey kind C
1 Shafts kind 1A - -
2 Shafts kind 1B 1 year 2,5 year -
3 Shafts kind 1C 5 year
3 Notwithstanding the requirements in -1 or -2, The Ordinary Surveys may be postponned for not more
than six months, when requested by the Owners, on the basis of the approval by the VR. However, this
postponement may be granted only once in an interval between Ordinary Surveys.
30
TCVN 5309:2001
3.5. Annual surveys
3.5.1. Annual surveys for hull, equipment, fire extinguishing systems, etc.
1 At each annual survey beetween special surveys, general condition for hull, equipment, fire
extinguishing systems, etc. are to be examined as far as practicable and placed in good order. Special
attention is to be paid to the following :
(1) Shell plating and piping systems above the waterline, externally;
(2) Visual inspection is to be carried out for structures close to water level to make sure there is no
damage due to impact (due to unit or other reasons).
(3) Openinga such as side scuttles, doors, etc. together with their closing appliances of which
watertightness and weathertightness are required ;
(4) Each deck ;
(5) Areas potentially having factigue damage due to stress concentration NDT examination may be
required if deemed necessary.
(6) Examine all navigational lights, alarm and sound devices including helicopter lights and other
safety systems.
(7) Mooring systems ;
(a) General examination of mooring lines ;
(b) General examination of installations for mooring systems ;
(c) General examination of anchors for anchor mooring systems ;
(d) General examination of steel pipes for tension mooring systems ;
(e) General examination of fenders or mooring lines for dolphin mooring systems ;
(8) Ventilators, air pipes and sounding pipes together with their closing appliances ;
(9) Bulwarks, guard rails, shutters of freeing ports, life lines, gangways and other similar means ;
(10) Construction of fire protection and means of escape including operation as far as practicable;
(11) Fire extingguishing systems including operation and functioning tests as far as practicable ;
(12) Examination of fire control plan;
(13) Examination of fire detection system as far as practicable;
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TCVN 5309:2001
(14) Examination of main fire system and verification of performance of fire pumps including
emergency pumps;
(15) Examination of fire main, nozzles, hydrauts to ensure their satisfactory performance and placed
in order ;
(16) Examination of control system of fixed fire extinguishing control system, fire main, fire alarm
signal, ensuring they are well maintained ;
(17) Fire extingguishing bottles are placed in order and well maintenance ;
(18) Remote control and shut-down system to stop fans, engines, stop tranfering fuel to engine
room;
(19) Shutdown systems for ventilation, funnels, skylight, acess and other relevant parts ;
(20) Examination to ensure fire extinguishing tools are adequate and good order.
(21) Examination of all hazardous areas including watertight doors and boundaries ;
(22) Ensure following equipments are in good operating condition :
(a) Ventilation system, fire extinguishing system, fans and relating devices;
(b) All machanical and electrical safety devices;
(c) Other safety equipment such as alarm system and communication system .
(23) For the units which are necessary to be provided with the stability booklet, loading manual and
the operating booklet are kept on board the unit for ready use ;
2 For self-elevating units, general examinations of the following iterms are to be carried out in addition to -
1 as far as practicable:
(1) Legs above the waterline ;
(2) Jack-house structure and attachment to upper hull or platform ;
(3) Jacking or elevating systems and leg guides, externally ;
(4) Plating and supporting structure in way of leg wells .
3 For column stabilized units, general examinitions of the following iterms are to be carried out in addition
to -1 as far as practicable:
(1) Upper hull and its supporting structure above the waterline ;
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TCVN 5309:2001
(2) Exposed parts of columns and bracings together with their connections above the waterline ;
4 For ship type units and barge type units, general examinations of construction of the surrounding to
openings such as a moonpool above the waterline are to be carried out in addition to -1 as far as
practicable .
5 The surveys required in the following is to be carried for the drilling derrick :
(1) A overall survey is to be carried outon drilling derrick with emphasis on the structural condition
including supporting structures, It is necessary to examine with respect to deformation and
slack/loose bolts (if of bolted design) .
(2) The drill floor and substructure are to be surveyed with emphasis on structural integriry and
supporting structure for equipment applied in drilling operations .
6 For the production units a survey is carried out on the structure supporting equipment and heavy
modules applied in the production operation .
3.5.2. Annual survey for Machinery installations and Electrical Installations
1 At each annual survey between special surveys for machinery installations and electrical installations,
general examination of machinery installations and electrical installations corresponding to relevant
machinery installations and electrical installations of the units are be carried out in addition to the
following surveys :
(1) The propelling machinery and essential auxiliaries are to be generally examined. The surveyor
may, in addition, require such further items ro be opened up as considered to ascertain that
theyare in good working condition .
(2) Machinery and boiler spaces with particular attention to the fire and explosion hazards, and also
emergency escape routes are to be examined .
(3) All main and auxiliary steering gears including their associated equipment and control systems
are to be examined and tested in operation .
(4) All means of communication between the navigation bridge, control station and the machinery
control positions, as well as the bridge and the alternative steering positions are to be tested .
(5) Bilge pumping systems and bilge wells including operation of pumps, remote reachrods and
level alarms where fitted, are to be examined as far as practicable.
(6) Boilers, thermal oil heaters, pressure and vessels and their mountings including safety devices,
foundations, controls relieving gear, high pressure and steam escape piping, insulation and
gauges are to be externally examined. Confirmation of the safety devices of the boilers and
33
TCVN 5309:2001
thermal oil heaters may be required as considered necessary by the surveyor.
(7) Electrical machinery, emergency sources of the electrical power, switchgear and other electrical
equipments are to be examined and also to be tested in operation as feasible.
(8) Confirmation as far as practicable of the operation of all emergency sources of power is to be
made and, if they are automatic, also in the automatic mode.
(9) Parts which are opened up for maintenance at Owner's option are to be examinated as
necessary.
(10) Where automatic and/or remote controls are fitted for essential machinery, they are to be tested
to demonstrate that they are in good working condition.
(11) Dynamic positioning systems are to be generally examined and performance tests of them are
to be carried out as far as practicable.
2 General conditions of electrical installations in the hazardous areas are to be examined. For the units of
ten years of age and over, insulation resistance of these installations is to be measured. The
measurement, however, may be dispensed with in case the proper measurement records are kept on
board and found satisfactory by the surveyor.
3 For the drilling units, the following are to be carried out:
(1) Where cross connections between piping system for drilling /well tesing operation and safe
piping system exitst the means for avoiding possible contamination of the safe system with the
hazardous medium are to be surveyed .
(2) In hazardous area the following equipment and systems are to be surveyed and tested :
(a) Ventilation including overpressure/flow and alarms;
(b) Self-closing gastight doors and airlocks including other openings/access;
(c) Alarms/shut-down of pressurized equipment;
(d) Electrical equipment and cables;
(e) Devices for monitoring of insulation resistance/earth leak monitoring including alarms;
(f) Protection devices for combustion engines;
(g) Emergency shut-down facilities
(3) The following systems to be surveyed and tested for correct functioning if found necessary by
the surveyor :
(a) Fire detection system;
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TCVN 5309:2001
(b) Gas detection system, both flammable and toxic;
(c) Alarms for abnormal drilling condition;
(d) General alarm system and communication between control stations.
(4) The apparatus for breathing protection and gas measuring devices are to be surveyed .
4 For the drilling plants if applicable, are to be surveyed satisfying following requirements :
(1) An overall survey of drilling related equipment, structures and systems with particular attention
to the structural integrity, fire/explosion hazards and personnel protection is to be carried out. If
deemed necessary by the surveyor running tests, NDT and/or opening of equipment may be
required .
(2) For overhead drilling equipment and lifting appliances for drilling and associated operations an
overall survey is to be carried out with particular emphasis on structural integrity. Examination
and functional testing to be carriedout as found necessary by the surveyor, e.g. safety devices
and emergency stop function. It is to be verified that the marking (SWL) is acceptable .
(3) Wire ropes (including end attachments) and sheaves of the tensioning drilling and associated
systems are to be surveyed. If deemed necessary by the surveyor, checking by NDT shall be
carried out .
(4) Pressure vessels are to be externally surveyed. The general condition of the pressure vessel
including mountings, piping and possible insulation is to be ascertained. The surveyor may
require opening/internal survey or thickness measurements and /or crack detection test if found
necessary. Safety valves, instrumentation and automation systems are to be surveyed and
tested in operating condition when found necessary by the Surveyor. Liquid level controls on
tanks/separators are to be tested .
(5) Piping systems including flexible pipes are to be surveyed. Thickness measurements are to be
carried out as deemed necessary by the surveyor. Safety valves are to be surveyed and tested
as deemed necessary by the surveyor .
(6) The mud and cement system is to be surveyed and pumps are to be exernally surveyed and
function tested .
(7) Marine riser joints as far as accessible and diverter system are to be visually surveyed and
inspected for corrosion, cracks and wear. Thickness measurements may be required by the
Surveyor .
(8) The blowout preventers are to be surveyed and pressure tested according to recognized code
or if not accessible, review of records/test log to be carried out .
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TCVN 5309:2001
(9) Well testing system to be surveyed .
5 For the production units, the following are to be carried out :
(1) A general examination of :
(a) Cargo tank openings and pressure/vacuum valves;
(b) Crude oil piping systems;
(c) Cargo pump rooms ;
(d) Escape routes ;
(e) Fire extinction systems in crude oil tank and pump room area.
(2) The following components and systems are to be surveyed and tested for correct functioning as
found necessary by the surveyor :
(a) Gas detection systems, flammable and toxic gases;
(b) Fire detection system;
(c) System for crude oil tank level measurements;
(d) General alarm system and communication between control stations .
(3) In hazardous areas the following equipment and systems are to be surveyed and tested :
(a) Ventilation system including overpressure alarms ;
(b) Alarms/shut-down for pressurized equipment and rooms ;
(c) Electrical equipment and cables ;
(d) Self-closing gastight doors, air locks, openings and accesses;
(e) Protection devices for combustion equipment and engines;
(4) The emergency shut-down system for :
(a) ventilation;
(b) wellhead valves/oil production facilities ;
(c) all non-essential electrical equipment
(d) all essential electrical equipment
is to be surveyed and function tested. Special attention is to be given to both manual and automatic
activation, power supply and alarms.
(5) Where cross connections between piping system for oil production and safe piping system exits,
the means for avoiding possible contamination of the safe system with the hazardous medium is
36
TCVN 5309:2001
to be surveyed .
6 For the production plants , the following are to be carried out :
(1) For equipment installed subsea at time of an annual survey a review of the maintenance
manual/test log is an acceptable survey method, provided satisfactory records and acceptable
maintenance procedure .
(2) An overall survey is to be carried out with particular emphasis on the structural interity of :
(a) Flare ;
(b) derrick;
(c) skids .
(3) Wire ropes (including end attachments) and sheaves of the tensioners and associated systems
are to be surveyed. If deemed necessary by the surveyor, checking by MPI shall be carried out.
(4) Pressure vessels and heat exchangers are to be externally surveyed. The general condition
including mountings, piping and possible insulation is to be ascertained. The surveyor may
require opening/internal survey or thickness measurements and /or crack detection test if found
necessary. Safety valves, instrumentation and systems on tanks/separators are to be surveyed
and tested in operating condition as found necessary by the surveyor .
(5) Piping system including flexible pipes is to be surveyed and pressure tested to working
pressure. Thickness measurements are to be carried out as deemed necessary by the surveyor
(6) High pressure/capacity pumps and compressors are to be externally surveyed and function
tested .
(7) Risers shall be visually surveyed and inspected for corrosion, cracks and wear as far as
accessible. Pressure tests to working pressure are to be carried out .
(8) The blowout preventers shall be surveyed and pressure tested to working pressure. NDT is to
be carried out to the extent deemed necessary by the surveyor .
(9) Riser handling devices and lifting devices for production and associated operations to be
generally surveyed and functional testing of appliance and safety devices carried out as found
necessary by the sutveyor. It is to be verified that the marking and component certificates are
available and acceptable .
(10) The process and utility safety systems are to be surveyed during operation and tested for
correct funstioning as found necessary by the surveyor with particular emphasis on :
(a) Shut-down valves ;
37
TCVN 5309:2001
(b) Shut-down instrumentation ;
(c) Shut-down sequence and logic ;
(d) Inter connection with emergency shut-down system;
(e) Regulation/control system
(f) Alarm/system;
(11) Drainage systems for produced liquids, for hazardous and non-hazardous area to be surveyed .
(12) Water protection systems in process area are to be surveyed .
7 Other examinations and tests deemed necessary by the surveyor are to be carried out .
3.6. Docking surveys
3.6.1. General
1 The unit is to be placed on blocks of sufficient height in a drydock or on a ship way .
2 Notwithstanding the requirement in -1, where the in-water survey is requested by the Owner and
approved by the VR as substitution for a survey in a drydock or on a ship way, the in-water survey may
be accepted. Where a docking survey is altered to the in-water survey, examinations deemed
appropriate by the VR are to be carried out .
3 Notwithstanding the requirement in -1 Docking survey for the units which are embedded on the sea
bottom permanently or semi-permanently may be substituted by in-water surveys or partly dispensed
with.
4 In addition to the requirements in 3.6.2, examinations as comprehensive as special surveys may be
required as to the iterms which are considered necessary by the surveyor on the occasion of docking
surveys .
3.6.2. Requirements for Docking survey
1 For all units, surveys are to be carried out in accordance with 3.4.1, Chapter 3, Part 1-B TCVN6259-
1:1997.
2 For self-elevating units, the following parts are to be cleaned and examined :
(1) An external surface of upper structure or platform below the waterline ;
(2) External surfaces of spud cans, mats, under water areas of legs together with their connection
parts ;
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TCVN 5309:2001
(3) The surveyor may request the non-destructive tests thereof, if these parts are deemed to be
suspect areas or substantial corrosion by the VR from the result of examination ;
3 For column stabilized units, the following parts are to be cleaned and examined
(1) An external surface of the upper hull or platform
(2) Footings, pontoons or lower hulls, underwater areas of columns, bracings and their connections
(3) Non-destructive tests may be required at important parts of the connections such as pontoon-
column connection, column-bracing connection where deemed necessary by the surveyor .
4 Particular attention is to be given to corrosion control systems in representative ballast tanks, free-
flooding areas and other locations subjected to sea water from both sides .
5 If the unit is provided with the dynamic positioning system, thrusters are to be examined
6 In conjunction with dry docking surveys, after special survey No. 1 and between subsequent special
surveys, the following ballast spaces are to be internally examinrd, thickness gauged and placed in
satisfactory condition. Alternatively, ballast tank corrosion control arrangements are to be verified
effective .
(1) For self-elevating units: Representative ballast tanks or free-flooding compartments in mats or
spud cans, if accessible, and at least two pre-load tanks .
(2) For column stabilized units: Representative ballast tanks in footings, lower hulls or free-flooding
compartments as accessible, and at least two ballast tanks in columns or upper hull, if
accessible .
(3) For ship type and barge type units : One peak tank and at least two other representative ballast
tanks between the peak bulkheads used primary for water ballast .
3.7. Intermediate Surveys
3.7.1. General
1 At each intermediate survey, all the requirements for an annual survey are to be complied with .
2 In addition to the requirement in -1, surveys required in following parts are to be carried out
3.7.2. Intermediate survey for hull, Equipment, fire extinguishing systems, etc.
1 For all units, the following requirements are to be complied with :
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TCVN 5309:2001
(1) Performance tests of openings such as side scuttles, doors, etc. required watertightness and
weathertightness together with their closing appliances; However, performance tests may be
dispensed with the discretion of the Surveyor.
(2) Performance tests of positioning systems for a long period of time together with their
installations ; and
(3) Examination of anchor racks and fair leaders for anchor cables above the waterline together
with hull connection of these .
(4) Examination of electrical equipment in hardous areas in particular :
(a) Grounding ;
(b) Explosive casing of equipment;
(c) Pressure regulating device casing and relevant components ;
(d) Conditions of safety devices ;
(e) Cable condition ;
(f) Electrical shutdown of areas fitted with dampers;
(g) Performance of pressure regulating device and function of alarm signal ;
2 For self-elevating units, examinations of the following iterms are to carried out as far as practicable.
(1) Representative ballast tanks or free-flooding compartments in mat or spud cans, if accessible,
and at least two representative pre-load tanks, internally and externally. However, where the
tanks corrosion arrangements are verified to be effective or it is impossible to examine internally
for these construction or these being under the sea bottom, and in case these conditions are
approved by the VR, an external examination of these is dispensed with.
(2) Connection parts between legs and bottom mats or footings. If deemed necessary by the
Surveyor, the Surveyor may request a non-destructive test of these parts .
3 For column stabilized units, examinations of the following items are to be carried out as far as
practicable .
(1) Representative ballast tanks in footings, lower hull or free-flooding compartments as accessible,
and at least two ballast tanks in columns, if accessible ;
(2) External columns, bracings, lower hulls and footings ;
(3) Connection parts between upper hull and columns, and columns and lower hulls or footings,
and bracings. If deemed necessary by the Surveyor, the Surveyor may request a non-
destructive test of these parts .
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TCVN 5309:2001
4 For ship type units and barge type units, general examinations of construction of the surrounding to
openings such as a moompool above the waterline are to be carried out in addition to 1 .
3.8. Special surveys
3.8.1. General
1 The first special survey of the unit after the classification survey during construction is designted as '
'Special survey No.1' and subsequent special surveys as designated as 'Special survey No.2' 'Special
survey No.3 ' and ...
2 The kind of special survey of the unit not built under survey is to be determined in the similar sequence
as specified in -1 basing upon what kind of special survey was corresponding to her classification survey
3.8.2. Special surveys for hull, equipment, fire extinguishing systems, etc
1 For all units, Special survey No. 1 for hull, equipment, fire extinguishing systems, etc., examinations and
tests specified in the following are to be carried out :
(1) Internal and external of hull, especially machinery room, cofferdams, and water tanks such as
water ballast tanks, and oil tanks such as fuel oil tanks deemed necessary by the VR are to be
examined corresponding to the kinds of the special survey .
(2) An overall survey is to be carried out with particular emphasis on the structural intergrity of the
deck with supporting structure .
(3) Tanks are to be tested under the pressure corresponding to the maximum head that can be
experienced in service or designed. A pressure tests of the tanks may be omitted, provided that
the Surveyor is satisfied with the condition of the tanks from the results of an external and
internal examinations of the tanks.
(4) The thickness of structural members of the following parts listed in (a) to (c) are to be gauged.
For accurate gauging, appropriate ultrasonic equipment or other approved means are to be
used. The results of the gaugings are to be reported to the VR .
(a) Structural members in any locations considered by the surveyor to be prone to rapid
wastage á showing excessive corosion.
(b) Representative parts of splash zones or related structure near the draught of operational
condition .
(c) Suficient parts of structural members for general asessment and recording of corosion
pattern .
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TCVN 5309:2001
(5) Anchors, chain cables and ropes for temporary mooring are to be ranged, examined and
measured .
(6) For mooring systems, the following examinations are to be carried out :
(a) Thorough examination of mooring lines
(b) Thorough examination of installations for mooring systems
(c) Thorough examination of anchors for anchor mooring systems
(d) Thorough examination of steel pipes for tension mooring system and thickness gauging of
the representative part of steel pipes
(e) General examination of fenders or mooring lines for dolphin mooring system
(7) For self-elevating units, the following examinations are to be carried out. However, where the
unit is examined in a float condition, the examinations are to be as deemed appropriate by the
VR .
(a) All legs including chords, bracings, gussets, racks, joints, together with leg guides.
Tubular or similar type legs are to be examined externally and internally to gether with
internal stiffeners and pinholes.
(b) Externals of jack-house structure and attachment to upper hull or platform, jacking or
elevating systems and leg guides, and plating and supporting structure in way of leg wells
are to be examined .
(c) Connection parts between legs and bottom mats or footings are to be examined. If
deemed necessary by the surveyor, the surveyor may request a non-destructive test of
these parts .
(d) Spud cans or mats are to be examined internally. Where spud cans or mats are partly or
entirely obscured below the mud line when the special survey is completed, consideration
will be given to postponement of these examinations until the next movement of the unit .
(e) Non-destructive tests may be required at important parts among those stated in the
foregoing (a), (b) and (c) where deemed necessary by the VR .
2 For column stabilized units, the following examinations are to be carried out. However, where the units is
examined in floating condition, the examinations are to be appropriate to the VR .
(1) Connections of columns and bracings to upper hull or platform and lower hull or pontoons are to
be sufficiently cleaned and examined .
(2) Joints of supporting structure including bracings together with gussets and brackets and internal
continuation or back-up structure for those are to be examined .
42
TCVN 5309:2001
(3) Internal and external parts of columns, lower hulls or footinga and bracings are to be examined
(4) Non-destructive examination may be required at suspect areas .
(5) A deadweight survey is to be carried out. Where the deadweight survey indicates a change from
the calculated light ship displacement in excess of 1% of the operating displacement, an
inclining test is to be conducted.
3 For ship type units and barge type units, the following examinations are to be carried out. However,
where the unit is examined in a floating condition, the examinations are to be appropriate to the VR.
(1) Structural appendages and ducts for posioning systema are to be examined .
(2) Hull structure around the openings such as the moon pool is to be examined .
(3) Non-destructive tests may be required at important parts or stress concentrated parts where
deemed necessary by the VR .
4 In special surveys after special survey No.1, thickness measurement in ballast tanks are to be carried
out in addition to -1 to -4.
5 In addition to the extent of survey required in 3.5.1 -5, thickness measurements and/or NDT examination
of main structural components and cheking of bolts after dismantling may be required as far as deemed
necessary by the surveyor .
3.8.3. Special surveys for Machinery Installations and Electrical Installations
1 At each special survey, the following requirements are to be complied with :
(1) All shafts except propeller and stern tube shafts thrust blocks and lineshaft bearings are to be
examined. The lower halves of bearings need not be exposed if alignment and wear are found
satisfactory .
(2) Reduction gears are to be opened up as considered necessary by the surveyor and gears,
pinions, gear teeth, shafts and bearings are to be examined .
(3) Air compressors with their intercoolers, filters and/or oil separators and safety devices, and all
pums and components used for essential services are to be opened up as considered
necessary by the surveyor and examined .
(4) All main and auxiliary steering gears including their associated equipment and control systems
are to be examined. They are to be opened up for further examination if considered necessary
by the surveyor .
43
TCVN 5309:2001
(5) Windlass and mooring winches are to be examined including operational tests. They are to be
opened up for further examination if considered necessary by the surveyor .
(6) Evaporators are to be opened up and examined. Their safety relief valves are to be checked
under working condition.
(7) The foundation bolts and chocks of mainand auxiliary engines, gear cases, thrust blocks and
line shaft bearings are to be examined.
(8) All air reservoirs and other pressure vessels for essential services together with their mountings
and safety devices are to be cleaned internally and examined internally and externally. If an
internal examination of them is not practicable, they are to be tested hydraulically to 1,5 times
the working pressure .
(9) Pumping and piping arrangements
(a) The bilge system : Valves, cocks and strainers of the bilge system including the
emergency bilge suction valve are to be opened up as considered necessary by the
surveyor and examinrd, and the systems including pumps, remote reachrods and level
alarms, where firtted, are to be tested in operation .
(b) The oil fuel, feed and lubricating oil systems and ballast connections and blanking
arrangement to deep tanks, together with all pressure filters, heaters and coolers for
essential servises are to be opened up and examined or tested as considered necessar
by the surveyor. All safety devices for the foregoing items are to be examined .
(c) Flammable oil tanks : Fuel oil tanks which do not form part of the hull structure are to be
examined internally and externally. At the special survey No. 1, the internal examination
of the tanks may be dispensed with, provided they are found satisfactory in the external
examination. All mountings, fittings and remote shut-off device are to be examined as far
as practicable .
(10) Spare parts are to be checked .
(11) Where automatic and/or remote controls are fitted up for essential machinery, they are to be
tested to demonstrate that they in good working order.
(12) Steam engines
(a) Steam turbine (main and auxiliary for essential service ) : Turbine blading, rotors together
with bearings, casings, condensers and couplings between turbine and reduction gears
are to be examined. At the special survey No.1 for the unit having more than one main
propulsion ahead turbines of well experienced type and emergency crossover
arrangements, the turbine casings need not be opened up provided vibration indicators
and rotorposition indicators are fitted and the operating records are considered
44
TCVN 5309:2001
satisfactory by the surveyor. The bulkhead stop valves and manoeuvring valves are to be
opened up and examined .
(b) Main steam piping
1) Selected number of main steam pipes are to be removed and examined internally.
In case where the pipes are jointed together by welding and impracticable to be
removed, alternative means such as inspection through inspection holes by optical
means or checking pipe wall thickness by ultrasonic test may be accepted, and in
this case welded seams are to be examined and crack detected to an extent as
considered necessary by the surveyor.
2) At the Special survey No. 3, and subsequent special surveys, pipes submitted to
internal examination are to be hydraulically tested to 1,5 times the working pressure
3) Where temperature of the steam at the superheater outlet does not exceed 450oC
steam pipes need not be examined at the special survey No. 1.
(13) Internal combustion engines ( main and auxiliary for essential service) :
(a) The following parts are to be opened up and examined : Cylinders, covers, valves and
valve gears, fuel pumps and fittings, scavenge pumps, scavenge blowers and their driving
devices, turbo chargers, pistons, piston rods, crossheads, guides, connecting rods, crank
shafts and all bearings, crank case fastening and explosion relief devices, cam shafts and
their driving gears, attached pumps and coolers, vibration dampers, balancers, and
couplings to the shafting .
(b) Crank shafts alignment is also to be checked .
(14) Electrical installations :
Electrical installations on unit the following surveys are to be carried out :
(a) The fittings on switchboards, section boards and distribution boards are to be examined,
and overcurrent protective devices are to be checked .
(b) Cables are to be examined as far as practicable without undue disturbance of fixtures .
(c) All generators are to be run under loaded condition, either separately or in parallel, and
performances of speed governors, generator circuit breakers and their associated relays
are to be tested as far as practicable .
(d) The insulation resistance of generators, switchboards, motors, heaters, lighting fittings
and cables are to be tested, and adjusted if it is found not to comply with the requirements
2.18.1 TCVN 6259-4:1997 .
(e) The whole systems of the emergency source of electrical power and its associated
equipment are to be tested to demonstrate that the whole system is in good working
45
TCVN 5309:2001
order, and if they are automatic, in the automatic mode .
(f) Navigation light indicators and all the means of communication between the navigation
bridge, the control station and the machinery control positions as well as the bridge and
alternative steering position, if fitted, are to be tested, and where considered necessary by
the surveyor, emergency stopping means of motors for fuel oil pumps, ventilating fans
and similar loads, interlocking devices for safety operation of electrical equipment, and
motors and their control gears for essential servces are to be tested.
(15) Machinery and boiler spaces with particular attention to the fire and explosion hazards, and
emergency escape routes are to be examined .
(16) Refrigerating installations
Where the refrigerating installations not classed with the VR are installed on board, the
following examinations are to be carried out :
(a) The condition on the safety devices attached thereto is to be examined to ensure that
they are in good order .
(b) The machinery is to be tested under working condition .
(c) Parts of condensers, evaporators, and receivers exposed to primary refrigerant are to be
tested at a pressure of 90% of the design pressure. However, the pressure test may be
replaced by means as deemed appropriate by the VR and where the relief valves fitted on
them are adjusted to opetate at lower than the design pressure, the testing pressure may
be reduced to 90% of the setting pressure of the relief valves. The above pressure test
may be dispensed with, at the discretion of the surveyor, except for those used for NH3
(R717) as refrigerant.
(17) For the unit having hazardous areas defined in 1.3.15 all electrical installations and cable
therein are to be examined, and insulation resistance of the electrical circuits therein is to be
measured .
(18) Dynamic positioning system
(a) Thorough examination of thruster systems is to be carried out .
(b) Non-destructive test for mayjor parts of thruster systems is to be carried out, if deemed
necessary.
(c) Examinations and performance test are to be carried out in accordance the test procedure
specified in 3.1.2 -3 (22)
2 For drilling units the following are to be carried out :
(1) The requirements stipulated in 3.5.2-3.apply with the additions given in the following:
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TCVN 5309:2001
(2) Function test of instrumentation and safety devices for equipment and system in 3.5.2-3 (3) is
to be carried out.
(3) It is to be verified that required signboards are in order.
(4) The drainage system of hazarddous area is to be surveyed ;
(5) System and equipment related to drilling are to be surveyed.
3 For driiling plants if these the following are to be carried out:
(1) The requirements stipulated in 3.5.2-4. apply with the additions given in the following :
(2) The derrick and flare boom installations are to be examined with emphasis on the structural
condition of bracings praticularly with respect to deformation and slack/loose boilts( if of boilted
design). Thickness measurements and/or NDT examination of main structural components and
checking of bolts after dismantling may be required as far as deemed necessary by the
surveyor .
(3) Main loading parts of overhead drilling equipment are to be checked by MPI. Thickness
measurements of structural parts are to be carried out as far as deemed necessary by the
surveyor . For lifting appliances thickness measurements and NDT of main structural parts are
to be carried out as far as deemed necessary. Lifting appliances except overhead drilling
equipment and B.O.P handling equipment are to be load tested.
(4) Pressure vessels are to be surveyed internally, or if this not practical, thickness measurements
to be carried out. Examination of related equipment, such as valves, pipes, etc., is to be carried
out. Examination of correct setting of safety valves including remote operation of same is to be
carried out. Pressure test to maximum allowable working pressure is to be carried out.
(5) Mud and cement pumps flui ends are to be surveyed and checked for cracks in critical areas .
(6) The marine riser system including diverter system and choke/kill lines is to be surveyed. Liquid
penetrants or MPI methods shall be used to investigate critical areas for cracks. Thickness
measurements may be required if found necessary by the surveyor. Pressure testing to
maximum allowable working pressure is to be carried out.
(7) The blowout preventer system is to be subject to complete performance test. Pressure testing to
maximum allowable working pressure is to be carried out. Records of overhaul are to be
reviewed.
(8) Piping systems including flexible pipes are to be pressure tested to working pressure.
4 For oil production units the following surveys are to be carried out :
47
TCVN 5309:2001
(1) The requirements stipulated in 3.5 apply with the additions given in the following;
(2) For units having boilers burning crude oil or slop, survey and testing of control equipment
including monitoring systems and shut-down functions related to the following systems are to be
carried out :
(a) Ventilation and gas-tightness, fuel supply line and boiler with boiler front lagging;
(b) Fuel pumps and heating arrangement;
(c) Drain pipe ducts and automatic closing drain traps;
(d) Inert and purging systems;
(e) Manual and automatic quick closing valves and shut-down systems;
(f) Boiler hood ventilation system;
(g) Boiler compartment ventilation ;
(h) Boiler front extinguishing system;
(i) Pilot burner arrangement ;
(j) Gastight bulkhead penetrations;
(k) Gas detection system;
(l) Fuel heater .
(3) For units having turbines, engines or boilers burning gas, survey and testing of the safety and
control equipment and alarm and shut-down functions related to the following systems are to be
carried out :
(a) Gas heating arrangement;
(b) Ventilation arrangement;
(c) Protection and flame screens;
(d) Gas freeing and purging systems;
(e) Manual and automatic shut-down system;
(f) Gas detection system;
(g) Pilot flame burner or fuel floor arrangement;
(h) Governor stability swiching from gas fuel to oil, or vice versa.
(4) Function test of instrumentaion and safety devices for component and systems given in 3.5.2 -
3.5.2.5 (2) is to be carried out
(5) The fire extinguishing system in/at :
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TCVN 5309:2001
(a) Crude oil tank area;
(b) Crude oil pump room;
(c) Engine and boiler room
(d) Helicopter deck.
are to be surveyed and tested for correct functioning
(6) It is to be verified that the required signboards are in order;
(7) The drainage system of the hazardous areas is to be surveyed;
(8) The insulation resistance of the electrical installation in the hazardous area is to be checked ;
(9) The fireman's outfit is to be surveyed.
5 For production plants the following are to be carried out :
(1) The requirements stipulated in 3.5.2 -6 apply with the additions given in the following ;
(2) The derrick installation is to be examined with emphasis on the structural condition of bracings
particularly with respect to deformation and slack/loose bolts (if of bolted design). Thickness
measurements and/or NDT ( non-destructive testing) examination of main structural
components and checking of bolts after dismantling may be required as far as deemed
necessary by the surveyor .
(3) Main loading parts of overhead production equipment are to be checked by MPI. Thickness
measurements of structural parts as far as deemed necessary required by surveyor. Thickness
measurements of structural components and/or NDT to be carried out as far as deemed
necssary .
(4) Internal surveys, or if this is not practical, thickness measurements of pressure vessels and heat
exchangers are to be carried out. Examination of related equipment, such as valves, pipes etc.
is to be carried out. Examination of correct setting of safety valves including remote operation of
same is to be carried out. Pressure test to maximum allowable working pressure to be carried
out .
(5) High pressure/capacity pumps and compressors shall be surveyed by opening up fully or partly
as deemed necssary by the surveyor. Pressure testing to be carried out when relevant and
found necssary by the surveyor .
(6) The riser system to be close visually surveyed. Liquid penetrations or MPI methods shall be
used to investigate critical areas for cracks. Thickness measurements may be required if found
necssary by the surveyor .
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TCVN 5309:2001
(7) The blowout preventer system shall be subject to complete overall and complete performance
test. Pressure testing to maximum allowable working pressure to be carried out.
(8) For lifting devices thickness measurements of structural parts to be carried out as far as
deemed necssary. NDT of main structural components may be required as far as deemed
necessary by the surveyor .
(9) The fixed water protection systems in process area are to be surveyed and tested for correct
functioning .
(10) Function test of safety devuces and instrumentation given in 3.5.2 -6 (10). Is to be carried out
6 Other examinations and tests deemed necessary by the surveyor are to be carried out .
3.9. Boiler and thermal oil heater surveys
3.9.1. General
Boiler and thermal oil heater surveys are to be carried out in accordance with the requipments in 3.10
Part 1-B, TCVN 6259-1:1997.
3.10. Propeller shafts and stern tube shaft surveys
3.10.1. General
Propeller shafts and stern tube shaft surveys are to be carried out inaccordance with the requipments in
3.11, Part 1-B,TCVN 6259-1:1997.
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