Rules for the Classification of Offshore Units Part -D Service Notations

Rules for the Classification of Offshore Units

PART D Service Notations

Chapter 1

NR 445.D1 DT R03 E April 2010

Marine Division 92571 Neuilly sur Seine Cedex France

Tel: + 33 (0)1 55 24 70 00 Fax: + 33 (0)1 55 24 70 25 Marine website: http://www.veristar.com Email: [email protected]

2010 Bureau Veritas - All rights reserved

ARTICLE 1

1.1. - BUREAU VERITAS is a Society the purpose of whose Marine Division (the "Society") is the classi-fication (" Classification ") of any ship or vessel or structure of any type or part of it or system therein col-lectively hereinafter referred to as a "Unit" whether linked to shore, river bed or sea bed or not, whetheroperated or located at sea or in inland waters or partly on land, including submarines, hovercrafts, drillingrigs, offshore installations of any type and of any purpose, their related and ancillary equipment, subseaor not, such as well head and pipelines, mooring legs and mooring points or otherwise as decided by theSociety.

The Society: prepares and publishes Rules for classification, Guidance Notes and other documents (Rules); issues Certificates, Attestations and Reports following its interventions (Certificates); publishes Registers.

1.2. - The Society also participates in the application of National and International Regulations or Stand-ards, in particular by delegation from different Governments. Those activities are hereafter collectively re-ferred to as " Certification ".1.3. - The Society can also provide services related to Classification and Certification such as ship andcompany safety management certification; ship and port security certification, training activities; all activi-ties and duties incidental thereto such as documentation on any supporting means, software, instrumen-tation, measurements, tests and trials on board.

1.4. - The interventions mentioned in 1.1., 1.2. and 1.3. are referred to as " Services ". The party and/or itsrepresentative requesting the services is hereinafter referred to as the " Client ". The Services are pre-pared and carried out on the assumption that the Clients are aware of the International Maritimeand/or Offshore Industry (the "Industry") practices.1.5. - The Society is neither and may not be considered as an Underwriter, Broker in ship's sale or char-tering, Expert in Unit's valuation, Consulting Engineer, Controller, Naval Architect, Manufacturer, Ship-builder, Repair yard, Charterer or Shipowner who are not relieved of any of their expressed or impliedobligations by the interventions of the Society.

ARTICLE 22.1. - Classification is the appraisement given by the Society for its Client, at a certain date, following sur-veys by its Surveyors along the lines specified in Articles 3 and 4 hereafter on the level of compliance ofa Unit to its Rules or part of them. This appraisement is represented by a class entered on the Certificatesand periodically transcribed in the Society's Register.

2.2. - Certification is carried out by the Society along the same lines as set out in Articles 3 and 4 hereafterand with reference to the applicable National and International Regulations or Standards.

2.3. - It is incumbent upon the Client to maintain the condition of the Unit after surveys, to presentthe Unit for surveys and to inform the Society without delay of circumstances which may affect thegiven appraisement or cause to modify its scope.2.4. - The Client is to give to the Society all access and information necessary for the safe and efficientperformance of the requested Services. The Client is the sole responsible for the conditions of presenta-tion of the Unit for tests, trials and surveys and the conditions under which tests and trials are carried out.

ARTICLE 33.1. - The Rules, procedures and instructions of the Society take into account at the date of theirpreparation the state of currently available and proven technical knowledge of the Industry. Theyare not a standard or a code of construction neither a guide for maintenance, a safety handbookor a guide of professional practices, all of which are assumed to be known in detail and carefullyfollowed at all times by the Client.Committees consisting of personalities from the Industry contribute to the development of those docu-ments.3.2. - The Society only is qualified to apply its Rules and to interpret them. Any reference to themhas no effect unless it involves the Society's intervention.3.3. - The Services of the Society are carried out by professional Surveyors according to the applicableRules and to the Code of Ethics of the Society. Surveyors have authority to decide locally on matters re-lated to classification and certification of the Units, unless the Rules provide otherwise.

3.4. - The operations of the Society in providing its Services are exclusively conducted by way ofrandom inspections and do not in any circumstances involve monitoring or exhaustive verifica-tion.

ARTICLE 4

4.1. - The Society, acting by reference to its Rules: reviews the construction arrangements of the Units as shown on the documents presented by the Cli-

ent; conducts surveys at the place of their construction; classes Units and enters their class in its Register; surveys periodically the Units in service to note that the requirements for the maintenance of class are

met.

The Client is to inform the Society without delay of circumstances which may cause the date or theextent of the surveys to be changed.

ARTICLE 55.1. - The Society acts as a provider of services. This cannot be construed as an obligation bearingon the Society to obtain a result or as a warranty.5.2. - The certificates issued by the Society pursuant to 5.1. here above are a statement on the levelof compliance of the Unit to its Rules or to the documents of reference for the Services providedfor.In particular, the Society does not engage in any work relating to the design, building, productionor repair checks, neither in the operation of the Units or in their trade, neither in any advisory serv-ices, and cannot be held liable on those accounts. Its certificates cannot be construed as an im-plied or express warranty of safety, fitness for the purpose, seaworthiness of the Unit or of its valuefor sale, insurance or chartering.5.3. - The Society does not declare the acceptance or commissioning of a Unit, nor of its construc-tion in conformity with its design, that being the exclusive responsibility of its owner or builder,respectively.

5.4. - The Services of the Society cannot create any obligation bearing on the Society or constitute anywarranty of proper operation, beyond any representation set forth in the Rules, of any Unit, equipment ormachinery, computer software of any sort or other comparable concepts that has been subject to any sur-vey by the Society.

ARTICLE 66.1. - The Society accepts no responsibility for the use of information related to its Services which was notprovided for the purpose by the Society or with its assistance.

6.2. - If the Services of the Society cause to the Client a damage which is proved to be the directand reasonably foreseeable consequence of an error or omission of the Society, its liability to-wards the Client is limited to ten times the amount of fee paid for the Service having caused thedamage, provided however that this limit shall be subject to a minimum of eight thousand (8,000)Euro, and to a maximum which is the greater of eight hundred thousand (800,000) Euro and oneand a half times the above mentioned fee.The Society bears no liability for indirect or consequential loss such as e.g. loss of revenue, lossof profit, loss of production, loss relative to other contracts and indemnities for termination of oth-er agreements.6.3. - All claims are to be presented to the Society in writing within three months of the date when the Serv-ices were supplied or (if later) the date when the events which are relied on of were first known to the Client,and any claim which is not so presented shall be deemed waived and absolutely barred. Time is to be in-terrupted thereafter with the same periodicity.

ARTICLE 77.1. - Requests for Services are to be in writing.7.2. - Either the Client or the Society can terminate as of right the requested Services after givingthe other party thirty days' written notice, for convenience, and without prejudice to the provisionsin Article 8 hereunder. 7.3. - The class granted to the concerned Units and the previously issued certificates remain valid until thedate of effect of the notice issued according to 7.2. here above subject to compliance with 2.3. here aboveand Article 8 hereunder.

7.4. - The contract for classification and/or certification of a Unit cannot be transferred neither assigned.

ARTICLE 88.1. - The Services of the Society, whether completed or not, involve, for the part carried out, the paymentof fee upon receipt of the invoice and the reimbursement of the expenses incurred.

8.2. Overdue amounts are increased as of right by interest in accordance with the applicable leg-islation.8.3. - The class of a Unit may be suspended in the event of non-payment of fee after a first unfruitfulnotification to pay.

ARTICLE 9

9.1. - The documents and data provided to or prepared by the Society for its Services, and the informationavailable to the Society, are treated as confidential. However: clients have access to the data they have provided to the Society and, during the period of classifica-

tion of the Unit for them, to the classification file consisting of survey reports and certificates whichhave been prepared at any time by the Society for the classification of the Unit;

copy of the documents made available for the classification of the Unit and of available survey reportscan be handed over to another Classification Society, where appropriate, in case of the Unit's transferof class;

the data relative to the evolution of the Register, to the class suspension and to the survey status of theUnits, as well as general technical information related to hull and equipment damages, are passed onto IACS (International Association of Classification Societies) according to the association workingrules;

the certificates, documents and information relative to the Units classed with the Society may bereviewed during certificating bodies audits and are disclosed upon order of the concerned governmen-tal or inter-governmental authorities or of a Court having jurisdiction.

The documents and data are subject to a file management plan.

ARTICLE 1010.1. - Any delay or shortcoming in the performance of its Services by the Society arising from an eventnot reasonably foreseeable by or beyond the control of the Society shall be deemed not to be a breach ofcontract.

ARTICLE 1111.1. - In case of diverging opinions during surveys between the Client and the Society's surveyor, the So-ciety may designate another of its surveyors at the request of the Client.

11.2. - Disagreements of a technical nature between the Client and the Society can be submitted by theSociety to the advice of its Marine Advisory Committee.

ARTICLE 1212.1. - Disputes over the Services carried out by delegation of Governments are assessed within theframework of the applicable agreements with the States, international Conventions and national rules.

12.2. - Disputes arising out of the payment of the Society's invoices by the Client are submitted to the Courtof Nanterre, France.

12.3. - Other disputes over the present General Conditions or over the Services of the Society areexclusively submitted to arbitration, by three arbitrators, in London according to the ArbitrationAct 1996 or any statutory modification or re-enactment thereof. The contract between the Societyand the Client shall be governed by English law.

ARTICLE 1313.1. - These General Conditions constitute the sole contractual obligations binding together theSociety and the Client, to the exclusion of all other representation, statements, terms, conditionswhether express or implied. They may be varied in writing by mutual agreement.13.2. - The invalidity of one or more stipulations of the present General Conditions does not affect the va-lidity of the remaining provisions.

13.3. - The definitions herein take precedence over any definitions serving the same purpose which mayappear in other documents issued by the Society.

BV Mod. Ad. ME 545 k - 17 December 2008

MARINE DIVISION

GENERAL CONDITIONS

RULES FOR THE CLASSIFICATION OFOFFSHORE UNITS

Part DService Notations

Chapter 1

Chapter 1 PRODUCTION, STORAGE AND OFFLOADING SURFACE UNITSApril 2010

The English wording of these rules take precedence over editions in other lan-guages.Unless otherwise specified, these rules apply to units for which contracts aresigned after April 1st, 2010. The Society may refer to the contents hereofbefore April 1st, 2010, as and when deemed necessary or appropriate.2 Bureau Veritas Rules for the Classification of Offshore Units April 2010

CHAPTER 1PRODUCTION, STORAGE AND OFFLOADINGSURFACE UNITS

Section 1 General1 Application 15

1.1 General1.2 Notations1.3 Structural requirements1.4 Design life1.5 Station keeping1.6 Scope of additional class notations1.7 Classification and towing / transit

2 Rule application 212.1 Unit parts2.2 Other items

3 Statutory requirements 223.1 General3.2 International Convention on Load Lines3.3 MARPOL 73/783.4 SOLAS3.5 IMO MODU

4 Symbols and definitions 224.1 General4.2 Definitions4.3 Reference co-ordinate system

5 Calculations 245.1 Calculations to be submitted

6 Design criteria and data 246.1 General6.2 Site data6.3 Operating loading conditions

7 Documentation to be submitted 257.1

Section 2 Subdivision and Stability1 General 27

1.1 Application

2 Stability 272.1 General 2.2 Intact stability2.3 Damage stabilityApril 2010 Bureau Veritas Rules for the Classification of Offshore Units 3

3 General arrangement of oil storage units 283.1 General3.2 Definitions3.3 Cargo tanks3.4 Location and arrangement of spaces adjacent to storage area3.5 Cargo pump rooms3.6 Drainage arrangements and slop tanks3.7 Ballasting of double bottom and narrow tanks

Section 3 Structure Design Principles1 Definition of units areas 30

1.1 Principles

2 Materials and testing 302.1 Design temperature2.2 Offshore areas2.3 Ship areas2.4 Steels with specified through thickness properties2.5 Inspection and checks

3 Structural principles 313.1 Accessibility for inspection during service3.2 General construction3.3 Plating3.4 Ordinary stiffeners3.5 Primary supporting members

4 Net scantling approach 374.1 Principle4.2 Corrosion additions

5 Thickness increments 375.1 General5.2 Thickness increment values

6 Bulkhead structure 376.1 General6.2 Plane bulkheads6.3 Swash bulkheads6.4 Racking bulkheads

7 Bottom, side and deck structure 387.1 General7.2 Particular requirements for the side structure

8 Reinforcements in way of supporting structures for hull attachments 398.1 Local arrangement

9 Welding and weld connections 399.1 General9.2 Offshore areas9.3 Ship areas4 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Section 4 Hydrodynamic Analysis1 General 41

1.1 Principle1.2 Hydrodynamic analysis

2 Environmental data for hydrodynamic analysis 412.1 General2.2 Nature of environmental data2.3 Environmental data to be submitted

3 Design conditions 423.1 Loading conditions3.2 Advance speed

4 Modelling principles 424.1 Hydrodynamic mesh4.2 Mass distribution4.3 Connection with other structures4.4 Water depth

5 Unit responses 435.1 Results5.2 Response Amplitude Operators5.3 Calculation of unit responses5.4 Design values for structural analysis

Section 5 Design Loads1 General 45

1.1 Principles1.2 Definitions1.3 Application criteria

2 Still water loads 462.1 Loading manual2.2 Hull girder still water loads2.3 Loading instrument

3 Wave loads 483.1 Factors of environment3.2 Hull girder wave loads3.3 Unit motions and accelerations

4 Load cases 504.1 General

5 Sea pressures 525.1 General5.2 Still water pressure5.3 Wave pressure in upright ship conditions5.4 Wave pressure in inclined ship conditionsApril 2010 Bureau Veritas Rules for the Classification of Offshore Units 5

6 Internal pressures 546.1 Definitions6.2 Internal pressures and forces6.3 Partly filled tanks6.4 Accommodation6.5 Flooding6.6 Testing

Section 6 Hull Girder Strength1 General 57

1.1 Principle1.2 Strength characteristics of the hull girder transverse sections

2 Yielding checks 572.1 Hull girder stresses2.2 Checking criteria2.3 Section modulus and moment of inertia

3 Ultimate strength check 583.1 General3.2 Partial safety factors3.3 Hull girder loads3.4 Hull girder ultimate bending moment capacities3.5 Checking criteria

Section 7 Hull Scantlings1 General 60

1.1 Principle

2 Plating 602.1 General2.2 Yielding check2.3 Buckling check

3 Yielding check of ordinary stiffeners 633.1 General3.2 Hull girder stresses3.3 Net section modulus and net shear sectional area of ordinary stiffeners in intact

conditions3.4 Net section modulus and net shear sectional area of ordinary stiffeners in

flooding conditions3.5 Net section modulus and net shear sectional area of ordinary stiffeners in testing

conditions

4 Buckling and ultimate strength check of ordinary stiffeners 664.1 Buckling check4.2 Ultimate strength check6 Bureau Veritas Rules for the Classification of Offshore Units April 2010

5 Primary supporting members 675.1 Application5.2 General5.3 Partial safety factors5.4 Structural modelling5.5 Load model5.6 Yielding strength criteria for ship areas5.7 Buckling check

6 Offshore area 726.1 Strength criteria for offshore area

7 Fatigue check of structural details 727.1 General7.2 Structural details7.3 Spectral fatigue analysis7.4 Deterministic fatigue analysis

Section 8 Other Structures1 Station keeping 76

1.1 General1.2 Turret mooring system 1.3 Spread mooring system 1.4 Calculations

2 Supports for hull attachments and appurtenances 772.1 General2.2 Calculations

3 Fore part 783.1 General3.2 Reinforcements of the flat bottom forward area3.3 Reinforcements of the bow flare area

4 Aft part 814.1 General4.2 Spread mooring

5 Superstructures and deckhouses 815.1 General

6 Helicopter deck 816.1 Reference standards6.2 Structure

7 Hull outfitting 817.1 Bulwarks and guard rails7.2 Towing arrangement

8 Launching appliances 818.1 Launching appliances used for survival craft or rescue boatApril 2010 Bureau Veritas Rules for the Classification of Offshore Units 7

Section 9 Local Structural Improvements1 Protection of hull metallic structures 82

1.1 General1.2 Plan for the corrosion1.3 Thickness increments

2 Post welding treatment 822.1 Scope2.2 Grinding of welds for fatigue life improvement2.3 Fatigue resistance assessment

3 Protection to explosions 833.1 General3.2 Areas to be considered3.3 Criteria3.4 Methodology3.5 Explosion pressure wave loads

4 Minor collision 854.1 General4.2 Risk analysis4.3 Assessment conditions4.4 Methodology

5 Dropped objects 865.1 General5.2 Methodology

Section 10 Access, Openings, Ventilation and Venting of Spaces in theStorage Area

1 Access, openings and ventilation 881.1 General1.2 Arrangement of cargo pump rooms1.3 Ventilation of cargo pump rooms1.4 Ventilation of pump rooms1.5 Cargo compartments1.6 Other compartments1.7 Spaces at non-manned end of the unit-air locks

2 Cargo and slop tanks venting, inerting, purging and gas-freeing 902.1 Cargo and slop tanks venting2.2 Cargo and slope tanks inerting, purging and/or gas-freeing crude oil tanks

3 Cargo tanks vents recovery system 933.1 General3.2 Capacity3.3 Materials and constructive measures3.4 Filters3.5 COTVR piping system3.6 Instrumentation3.7 Safeguards8 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Section 11 Equipment and Safety Particulars1 General 95

1.1

2 Hazardous areas 952.1 General2.2 Classification of hazardous areas due to oil storage and offloading

3 Ventilation 963.1 General

4 Electrical installations 964.1 General

5 Machinery 965.1 General

6 Fire protection 966.1 General6.2 Passive fire protection6.3 Fire water pumps6.4 Cargo pump rooms6.5 Fixed deck foam system6.6 Emergency and offloading control station

7 Life saving appliances 1007.1 Life saving appliances

Section 12 Piping Systems1 General 101

1.1 Application1.2 Separation of systems

2 Bilge - Ballast - Oil fuel - Scupper lines 1012.1 General2.2 Bilge system2.3 Segregated ballast tanks within the storage area2.4 Air and sounding pipes2.5 Ballast tanks located outside the storage area (within gas safe zones)2.6 Carriage of ballast in cargo tanks2.7 Scupper lines

3 Cargo piping and pumping system 1033.1 General3.2 Cargo pumping system3.3 Cargo piping design3.4 Cargo piping arrangement and installation

4 Inert gas systems 1064.1 Application4.2 General4.3 Principles4.4 Design and arrangement of the system4.5 Additional requirementsApril 2010 Bureau Veritas Rules for the Classification of Offshore Units 9

5 Hydrocarbon blanket gas system 1115.1 General5.2 Materials5.3 Piping system5.4 Capacity of the system5.5 Venting arrangement and pressure/vacuum protection5.6 Instrumentation5.7 Safeguards5.8 Miscellaneous

6 Cargo and slop tanks fittings 1126.1 Application6.2 Protection of cargo and slop tanks against overfilling6.3 Cargo and slop tanks level gauging systems6.4 Heating systems intended for cargo and slop tanks6.5 Cleaning of cargo and slop tanks6.6 Gas detectors6.7 Cathodic protection6.8 Aluminium paints

7 Bow or stern cargo oil transfer 1157.1 General7.2 Piping requirements7.3 Openings7.4 Coamings7.5 Fire fighting7.6 Fire-fighting system7.7 Remote shut-down

Section 13 Use of Process Gas and Crude Oil as Fuel1 General 116

1.1 Application1.2 Additional requirements 1.3 Documents to be submitted1.4 Definitions

2 Requirements applicable to process gas and to crude oil 1162.1 Principle2.2 Ventilation2.3 Gas detection2.4 Electrical equipment

3 Use of process gas 1173.1 Gas conditioning and storage conditions3.2 Gas fuel supply to engines and boilers3.3 Dual fuel engines3.4 Dual fuel boilers10 Bureau Veritas Rules for the Classification of Offshore Units April 2010

4 Use of crude oil 1204.1 General4.2 Arrangement of machinery spaces4.3 Pumps4.4 Heating arrangements4.5 Piping system4.6 Additional requirements for boilers4.7 Additional requirements for engines

Section 14 Swivels and Risers1 Swivels 124

1.1 Pressure swivels1.2 Electrical swivels1.3 Test of pressure swivels1.4 Tests of electrical swivels

2 Marine risers systems 1242.1 General2.2 Riser system design2.3 Riser and riser components2.4 Riser supportsApril 2010 Bureau Veritas Rules for the Classification of Offshore Units 11

12 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Part DService Notations

CHAPTER 1

PRODUCTION, STORAGE AND OFFLOADINGSURFACE UNITS

SECTION 1 GENERAL

SECTION 2 SUBDIVISION AND STABILITY

SECTION 3 STRUCTURE DESIGN PRINCIPLES

SECTION 4 HYDRODYNAMIC ANALYSIS

SECTION 5 DESIGN LOADS

SECTION 6 HULL GIRDER STRENGTH

SECTION 7 HULL SCANTLINGS

SECTION 8 OTHER STRUCTURES

SECTION 9 LOCAL STRUCTURAL IMPROVEMENTS

SECTION 10 ACCESS, OPENINGS, VENTILATION AND VENTING OF SPACES INTHE STORAGE AREA

SECTION 11 EQUIPMENT AND SAFETY PARTICULARS

SECTION 12 PIPING SYSTEMS

SECTION 13 USE OF PROCESS GAS AND CRUDE OIL AS FUEL

SECTION 14 SWIVELS AND RISERSApril 2010 Bureau Veritas Rules for the Classification of Offshore Units 13

14 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Pt D, Ch 1, Sec 1SECTION 1 GENERAL

1 Application

1.1 General

1.1.1 The present Chapter deals with particular provisionsapplicable to floating units for production, and/or storage ofhydrocarbons, and intended to receive one of the notationslisted in [1.2.1].

1.1.2 Requirements of the present Chapter are complemen-tary to provisions of Part A, Part B and Part C which remainapplicable, except where otherwise specified.

1.2 Notations

1.2.1 Structural type and service notationsThe requirements of the present Chapter apply to surfaceunits having one of the following combination of structuraltype and service notations:

offshore service barge oil storage

offshore service barge production

offshore service barge oil storage / production

offshore service ship oil storage

offshore service ship production

offshore service ship oil storage / production

oil tanker ESP / offshore service ship oil storage

oil tanker ESP / offshore service ship production

oil tanker ESP / offshore service ship oil storage / pro-duction

For the definition of these notations, see Part A, Chapter 1.

The structural type notation offshore service barge isgranted to surface type floating production and/or storageunits, including the case of converted ships, when unable toperform non-assisted voyages.

The structural type notation offshore service ship is grantedto surface units having a propulsion system and steeringappliances for transit purpose, but not involved in the trans-port of cargoes, as defined in [4.2.14].

The notation oil tanker ESP / offshore service ship isgranted only to oil tankers used as offshore floating produc-tion and/or storage units, being able to perform non-assistedvoyages involving transport of cargoes as defined in[4.2.14]. When the notation of the unit is oil tanker ESP orcombination hereof, the requirements of Ship Rules relatedto this notation are also to be complied with.

1.2.2 Classification Society involvementThe scope of classification for units listed above is based onan appraisal of the integrated unit covering in general:

a) Hull, accommodation, helideck and hull attachmentsand appurtenances including:

riser support structure

structure to which the moorings are attached, andsupports for mooring equipment

foundations for the support of topsides modules, theflare tower, and the hull mounted equipment

support structure for life saving appliances

passive fire protection and cathodic protection

b) Intact and damage stability

c) Marine equipment (with foundations) pertaining to theoffloading facilities

d) Accommodation quarters

e) Mooring system:

mooring line components (anchors, chains, wireand accessories)

hull mounted equipment (fairleads, stoppers...)

mooring line handling equipment (winch,sheaves...)

f) Lifting appliances (in case of the additional class nota-tion ALM)

g) Equipment and systems necessary for the safe operationof the hull and to the safety of personnel on board asdefined in the Rules for the Classification of OffshoreUnits and related applicable Rules (taking into accountthe additional service features AUTO and IG, and theadditional class notation LSA)

h) Equipment and systems installed in the hull, the failureof which may jeopardise the safety of the floating unit

i) The fire and gas detection system for the hull as well asthe definition of the hazardous areas of the hull

j) The fire water and foam system for the protection of thehull

k) Topsides process plant

l) Propulsion plant.

Some of the systems and items mentioned in items g), h), i),j) and k) above are possibly positioned in topsides facilitiesand remain under scope of classification regardless of theadditional class notation PROC (see also [1.6.2]).

For each project, the detailed boundaries for the classifica-tion of offshore service barge or offshore service ship aredefined by the Society on case by case basis and with refer-ence to the requested structural type and service notations,additional class notations and additional service features.April 2010 Bureau Veritas Rules for the Classification of Offshore Units 15

Pt D, Ch 1, Sec 11.2.3 General application of the Rules

The provisions of these Rules are applicable to the designand construction of newbuild ship shaped units and toreassessment and conversion work of an existing unit orship when converted to a unit covered by the present docu-ment (see also [1.3.3]).

When reference is made to Ship Rules, it means the Rulesfor Steel Ships (NR467), and the applicable version of theseShip Rules (see definition in [4.2.6]) is the latest one.

The Society reserves its right to refer to previous editions ofShip Rules for conversions.

The Society may consider the acceptance of alternatives tothese Rules, provided that they are deemed equivalent tothe Rules to the satisfaction of the Society.

1.2.4 Classification process

For units with notations as given in [1.2.1] except combina-tion with oil tanker ESP, the classification process prior toissuance of final class certificate includes towing from com-pletion yard to site (see [1.7], hook-up operations and com-missioning at site). For units with the notation oil tanker ESPor combination hereof, the classification process may leadto issuance of final certificate at an earlier stage dependingon the actual intended service of the unit and possible com-missioning activities at the constructing yard.

Procedures and detailed schedules for construction at eachconstruction site together with towing/transit, installation,anchoring and production hook-up, and commissioningactivities are to be submitted to the Society for information.These documents are also to indicate the possible interfacesbetween the various Contractors to the Owner. Based onthese documents, the Society prepares the survey programfor inspection and drawing review.

1.2.5 Classification Design Criteria Statement

Classification is based upon the design data or assumptionsspecified by the party applying for classification. A DesignCriteria Statement is to list the services performed by theunit and the design conditions and other assumptions onthe basis of which class is assigned to the unit.

The Design Criteria Statement is to be issued by the Society,based on the information provided by the party applying forclassification.

The Design Criteria Statement is to be referred to on theunits Classification Certificates.

The Design Criteria Statement is to be incorporated in theOperating Manual, as stated in Pt A, Ch 1, Sec 1, [3.4].

Additional details about the Design Criteria Statement aregiven in Pt A, Ch 1, Sec 1, [1.6].

1.2.6 Classification Temporary conditions duringconstruction

In accordance with the provisions of classification, any tem-porary conditions during fabrication, load out, intermediatetowing/transit between two construction sites before com-plete finalisation of the unit and final load out of topsidemodules are considered beyond scope of classificationunless specific demand has been received from the partyapplying for classification.

The Society issues a provisional certificate upon completionof the hull and with design criteria for towing/transit condi-tion clearly identified.

Corrosion protection systems are to be arranged for the hullduring the outfitting phase. The documentation is to be sub-mitted to the Society for information. The Society mayrequire thickness measurements to be carried out prior toleaving the yard.

1.2.7 Classification Surveys during serviceWhen the notation of the unit is oil tanker ESP / offshoreservice ship, the requirements for survey of ships with serv-ice notation oil tanker ESP as given in the Ship Rules areapplicable. In addition, the Society may allow the continu-ous survey system for hull to be applied and may allow thebottom survey in dry-dock to be replaced by in-water sur-vey.

For units classed with notations not including oil tankerESP, the Society bases the survey requirements as for oiltanker ESP. The Society adapts the required surveys to thespecificities of these units in terms of operational condi-tions, which are to be documented and made available tothe Society.

Prior to entering in service, a classification renewal planlisting the survey plan for the five year classification periodmust be submitted to and approved by the Society.

Regarding the mooring lines (within the scope of POSAservice feature), the Inspection, Maintenance and Repair(IMR) plan for the station keeping system is to be agreedwith the Society prior to entering in service.

RBI methodology may assist the Owner in defining moreaccurately required examinations, in co-operation with theSociety.

The period of class means the period starting either from thedate of the initial classification, or from the credited date ofthe last class renewal survey and is generally 5 years.

1.2.8 Permanent installationsSurface units with notation as given in [1.2.1] are consid-ered as permanent installations performing its service at asingle location, or for a duration not less than, typically,5 years on a single site. Two types of permanent installationare to be considered:

disconnectable, when the unit has a means of disengag-ing from its mooring and riser systems extreme environ-mental or emergency conditions,

non-disconnectable.

A permanent installation is given a site notation consistingin the name of the unit operation field.16 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Pt D, Ch 1, Sec 11.2.9 Non permanent installationsIn case of mobile units not considered as permanent instal-lations, special requirements are to be met based on theoperating requirements. Such requirements are to be men-tioned in the Design Criteria Statement which may influ-ence not only the design but also the in-service inspections.

1.2.10 Site, transit and navigation notationsSite, transit and navigation notations are granted in accord-ance with the provisions of Pt A, Ch 1, Sec 2, [5].

1.2.11 Additional service featuresThe additional service features stated in Tab 1 and definedin Part A, are mandatory for units covered by the presentChapter.Note 1: For units other than those covered by the present Chapter,these service features are optional.

1.2.12 Additional class notationsThe additional class notations stated in Tab 2 and defined inPart A may be granted to units covered by the present Chapter.

In addition, additional class notations as given by the ShipRules may be granted.

1.2.13 Comfort on board floating unitsThe notations dealt with under this heading are relevant tothe assessment of comfort and health on board floatingunits with regard to the level of noise and/or vibration.

The parameters which are taken into consideration for theevaluation of the comfort such as the level of noise, and thelevel of vibration is indicated in the relevant annex to theCertificate of Classification.

The parameters are only verified once for all when the unitis classed.

As an initial approach, the requirements for the additionalclass notations COMF HEALTH-NOISE-g and COMFHEALTH-VIB-g given in Part C, Chapter 5 are to be consid-ered. The Society is to take into account realistic criteriaupon the final evaluation of the unit and based on Ownerrequirements.

1.2.14 STAR-MACH and STAR-MACH SISThe additional notations STAR-MACH and STAR-MACH SISreflect that a risk analysis has been performed for the unitsmachinery and systems, based on the application of opera-tional and maintenance procedures.

Table 1 : Additional service features

Table 2 : Additional class notations

Additional service feature Reference for definition Remarks

AUTO Pt A, Ch 1, Sec 2, [7.3] Control and safety system

POSA Pt A, Ch 1, Sec 2, [7.2] Mooring system of permanent offshore units

IG Pt A, Ch 1, Sec 2, [7.5] Inert gas system for cargo tanks

VeriSTAR-Hull Pt A, Ch 1, Sec 2, [7.6] Structural assessment through partial 3D finite element model (1)

HEL Pt A, Ch 1, Sec 2, [7.4] and Pt D, Ch 1, Sec 8, [6]

Helicopter facilities (2)

(1) When an increased fatigue life is specified, the additional service feature VeriSTAR-Hull is to be completed with DFL xx years, as stated in Pt A, Ch 1, Sec 2, [7.6].

(2) The additional service feature HEL is mandatory only for units having a helideck fitted onboard.

Additional class notations Reference for definition Remarks

STI Pt A, Ch 1, Sec 2, [6.2.10] Specific thickness increments

RIPRO Pt A, Ch 1, Sec 2, [6.2.6] Risers

PROC Pt A, Ch 1, Sec 2, [6.2.5] Process systems

DYNAPOS Pt A, Ch 1, Sec 2, [6.2.3] Dynamic positioning systems

ALP, ALM, ALS Pt A, Ch 1, Sec 2, [6.2.2] Lifting appliances

LSA Pt A, Ch 1, Sec 2, [6.2.7] Life saving appliances

COMF HEALTH-NOISE-g Pt A, Ch 1, Sec 2, [6.2.11] Comfort - noise

COMF HEALTH-VIB-g Pt A, Ch 1, Sec 2, [6.2.11] Comfort - vibrations

HIPS Pt A, Ch 1, Sec 2, [6.2.12] High integrity protection systems

Spectral Fatigue Pt A, Ch 1, Sec 2, [6.2.13] Fatigue check based on spectral fatigue calculations

VeriSTAR-Hull FLM Pt A, Ch 1, Sec 2, [6.2.14] Structural assessment performed through full length 3D finite elementmodel

STAR-MACH Pt A, Ch 1, Sec 2, [6.2.8] Risk analysis of machinery and other equipments, based on theapplication of operational and maintenance procedures (1)

STAR-MACH SIS Pt A, Ch 1, Sec 2, [6.2.8] Risk analysis of machinery and other equipments, based on theapplication of operational and maintenance procedures, when aPlanned Maintenance Survey System is implemented (1)

(1) Further details related to the assignment of additional notations STAR-MACH and STAR-MACH SIS are given in [1.2.14].April 2010 Bureau Veritas Rules for the Classification of Offshore Units 17

Pt D, Ch 1, Sec 1The additional notations STAR-MACH and STAR-MACH SISmay be assigned for units complying with the relevantrequirements of Pt E, Ch 1, Sec 3 of the Ship Rules, as fol-lows:

STAR-MACH SIS, for units on which a Planned Mainte-nance Survey System (PMS), as defined in Pt A, Ch 2,Sec 1, [3.4], is implemented.

STAR-MACH, for all other units.

For specific systems fitted onboard floating, storage andoffloading units and covered by the classification, such as:

pressure vessels, piping system and mechanical equip-ment for hydrocarbon processing

wellheads and Xmas trees

topside pumps, compressors and turbines

depressuring and flaring systems

control systems of hydrocarbon processing plant

safety shutdown system of hydrocarbon processingplant

utility systems of hydrocarbon processing plant

pressure and electrical swivels

riser system and components

offloading systems and components,

necessary documentation is to be submitted for the purposeof risk analysis, in addition to the ones required in Pt E, Ch1, Sec 3 of the Ship Rules.

A particular attention is to be given to systems covered bythe additional notations PROC and RIPRO.

1.3 Structural requirements

1.3.1 DefinitionSurface units are in principle similar to oil trading tankerswith the main difference in the following parameters:

site specific as opposed to ocean trading

towing or transit only for voyage between constructingshipyard and intended site, and between different ship-yards

continuous loading and offloading operations at sea

topsides facilities in continuous operations

inspection, repair and maintenance at sea, with no dry-docking for the intended service life

permanently moored.

Documentation of the above must be made available to theSociety for reference.

1.3.2 PrinciplesDesign loads and motions are to be evaluated based on thefollowing:

a) Classification marks and notations

b) Environmental conditions (transit/towing phases, site)

c) Production effects (lightweight, loading cases).

When a navigation notation completes the site and/or tran-sit notations of the unit (as defined in Pt A, Ch 1, Sec 2, [5]),the estimated loads and motions from the hydrodynamicanalysis are to be compared to the rule values given for thegranted navigation notation in order to determine the ruledesign loads and motions.

The purpose of the hydrodynamic analysis is to concludethe complements and assumptions for applying the ShipRules (see Ch 1, Sec 4).

A Design Criteria Statement, as defined in [1.2.5], lists theservices performed by the unit and the design conditionsand other assumptions (including results of the hydrody-namic analysis) on the bases of which class is assigned tothe unit.

Considering the intended service life with possible objec-tive of no dry-docking during this period, accessibility forin-service inspections shall be considered during the detaildesign phase.

1.3.3 Conversions Feasibility studyA feasibility study is required for projects based on conver-sion of existing seagoing ships to units with notations asgiven in [1.2.1].

As a minimum, complete re-measurements of the scantlingsincluding comprehensive surveys are required to evaluatethe condition of the unit. Minimum requirements aredefined on a case by case basis.

1.3.4 LoadsThe design of the structure is to consider relevant loadingconditions and associated loads including:

a) still water conditions

b) extreme environmental conditions during units opera-tion (100 year wave)

c) offloading conditions

d) limiting conditions before the disconnection from singlepoint mooring, if relevant

e) conditions during maintenance or inspection operations

f) transit/towing conditions, from the construction/conver-sion location to offshore site and between constructingshipyards, if more than one

g) loads induced by process and other equipment, inabove conditions, as relevant

h) damaged conditions, in accordance with the provisionsof Part B, Chapter 2 and Part B, Chapter 3, and takinginto account the damage assumptions as given in Ch 1,Sec 2.

1.3.5 Hull attachments and appurtenancesLoads on the hull are to be clearly identified by shipyard ordesigner. All structures welded to the hull (such as majorsupports for topsides, flare tower, pipe rack and other hullappurtenances) should be considered regardless the actualscope of Classification for these structures. Loads are to beindicated for operation, design, towing and damage condi-tions.18 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Pt D, Ch 1, Sec 1When attached structures and equipment are designed byan independent contractor, the Society may require theOwner to provide additional design analysis integrating theloads on attached structures and structure design of thehull, if not foreseen in design specification.

The attachments and appurtenances are within scope ofClassification if the supported equipment is within scope ofClassification, mentioned elsewhere in the present Rules oressential for the safety of the unit. Otherwise, the interfacebetween classed and non-classed part is to be defined on acase by case basis.

1.3.6 Definition of ship areasFor the hull construction, and similarly to the approach fordesign detailed in the present document, the shipbuildingpractice, industry and regulatory requirements, and the ShipRules (as defined in [4.2.6]) are the base reference for theconstruction of hull current parts, including materials,detailing, welding qualification, fabrication tolerances andinspection (see Ch 1, Sec 3, [2.3]). Any deviation from thesestandards is to be clearly documented on constructiondrawings and in specifications.

When applying the Ship Rules for the design of the hull cur-rent parts, attention is to be paid to the loads specified in[1.3.4].

The Society reserves the right to require additional docu-mentation for design of ship structures like skeg, bilge,equipment supports, etc.

1.3.7 Definition of offshore areasFor areas that are specific to the offshore service, such aselements listed in Ch 1, Sec 3, Tab 1, reference is made toPart B. More details are given in Ch 1, Sec 3, [2.2].

In case of conflict between the Ship Rules and the presentChapter, the latter one is to take precedence over therequirements of the Ship Rules.

1.4 Design life1.4.1 The requirements about Service Life, Design life,unit modifications and unit re-assessment are given in Pt A,Ch 1, Sec 1, [1.7].

1.5 Station keeping1.5.1 GeneralThe additional service feature POSA (mandatory for perma-nent units) covers the complete installation from anchors orpiles and their fixation in seabed to the fastening devices onthe unit hull for mooring. The provisions for classificationare given in the Guidance Note NI 493 Classification ofMooring Systems for Permanent Offshore Units.

The station keeping of the unit can be reached by a verylarge number of different design configurations, which aresubject to review on a case by case basis:

a) Floating structures may use catenary, taut spread moor-ings and/or dynamic positioning systems. Mooring linescan be combined into a turret base (SPM single pointmooring) with a single point of contact to the hull of thefloating unit or the lines may be connected to variouspositions on the hull (spread mooring system).

b) The floating unit may be connected to a fixed towerusing a pendulum link arrangement instead of the moor-ing hawser.

c) Mooring System can be based on use of the CatenaryAnchor Leg Mooring (CALM) concept (pendulum link orrigid arm connection to the hull of the floating unit).

d) External or internal turret in hull of floating structureenabling weathervaning of the hull in particular forunits positioned in severe environmental areas.

The assessment of a mooring system requires the evaluationof unit motions, and the resulting excursions and line ten-sions, under specified environmental conditions.

The structural parts of the station keeping system are tocomply with Part B, Chapter 2 and Part B, Chapter 3 in addi-tion to the provisions of the Guidance Note NI 493 Classi-fication of Mooring Systems for Permanent Offshore Units.

When the station keeping of the unit is achieved by meansof a turret, the structure of the turret and structures connect-ing the turret to the hull, are to be designed in accordancewith the provisions of Ch 1, Sec 8, [1.2].

When the station keeping of the unit is achieved by means ofa spread mooring system, reference is made to Ch 1, Sec 8,[1.3].

1.5.2 Dynamic position systemsThe mooring system may consist partly (combined with pas-sive mooring systems as described in [1.5.1]) or entirely ofdynamic positioning systems, for which the Society makesreference to the requirements given for the additional classnotation DYNAPOS in the Ship Rules, Pt E, Ch 10, Sec 6.

1.5.3 Mooring to buoyThe mooring of the floating unit may be assured through abuoy, which is a floating body, usually not manned, gener-ally of a cylindrical shape, and fitted with mooring equip-ment as necessary. Such buoy may also ensure the fluidtransfer between production and/or storage unit or onshoreinstallation and the moored floating unit.

The buoy including its mooring system is to be classed bythe Society. The additional service feature POSA is to begranted to the buoy.

The arrangement of the buoy is to comply with the RuleNote NR494 Rules for the Classification of Offshore Load-ing and Offloading Buoys.

1.5.4 Single Point MooringFor mooring to an existing Single Point Mooring (SPM) (pos-sibly classed by other Classification Society) detailed docu-mentation of the SPM is to be submitted to the Society forreview. This documentation must include certificate, designand maintenance. The Society reserves the right to requirecomplete re-classification of the installation includingremeasurement of lines and anchors.April 2010 Bureau Veritas Rules for the Classification of Offshore Units 19

Pt D, Ch 1, Sec 11.6 Scope of additional class notations

1.6.1 Classed topsides Notation PROCThe structure of topside modules supporting entirely classedequipment is covered by class and is to be designed andbuilt in accordance with the relevant requirements of Part B,Chapter 2 and Part B, Chapter 3.

When the additional class notation PROC is granted, thestructure of deck modules, flare boom and other structureshousing production equipment and related facilities are tobe designed and built in accordance with the relevantrequirements of Part B, Chapter 2 and Part B, Chapter 3.

Subject to initial agreement, topsides structures, if not sub-ject to green waters, may be designed following other rec-ognized standards, provided due consideration is given toinertial loads, overall deformations of the unit, differentialdisplacements of supports points and other relevant load-ings, in accordance with the provisions of Part B, Chapter 2.

1.6.2 If notation PROC not requestedWhen the additional class notation PROC is not requested,the structure of deck modules, flare boom and other struc-tures housing production equipment is not covered by clas-sification.

For equipment and piping installations, where classed sys-tems within the hull have some part of their facilitieslocated within the topsides, these facilities are covered byclassification. The Society reserves the right to include inthe scope of classification the structure of the supportingskid and its connection to the topside structure, even if thisstructure is mainly supporting production facilities.

For these equipment and systems, classification covers theequipment necessary to the proper operation of the con-cerned systems as requested by the Rules of the Society andrelated applicable Rules.

Figure 1 : Example of classification limits

Classification excludes all the equipment only necessary to theoperation of the topsides systems. For these systems, uponreceiving specific information and request, the Society endeav-ours to verify that failure of equipment and system external tothe scope of classification does not impair significantly hullinstallation. For structure supporting classed equipment, theattending Surveyor verifies the proper fitting of local supportingelements as indicated by the manufacturer of the equipment.

Particular attention is to be made to the design of the piperack on the main deck, which remain within scope of classi-fication regardless of presence of pipes serving the topsidesprocess plants.

Fig 1 and Fig 2 show examples of classification limits fordifferent types of appurtenances.

1.6.3 Riser attachment - Additional class notationRIPRO

The additional class notation RIPRO may be assigned tounits fitted with risers meeting the corresponding require-ment of Ch 1, Sec 14, [2].

In case the additional class notation RIPRO is not requestedby the Owner, the classification is limited to the riser foun-dations securing the risers to the floating unit. Documenta-tion of the estimated design loads is to be submitted to theSociety for information.

As risers influence the anchoring system of the hull, theSociety reserves its right to require appropriate documenta-tion for the installation although the additional class nota-tion RIPRO may not be requested.

Equipment fitted onboard for the installation of risers are con-sidered as outside scope of classification unless requested byOwners or an additional class notation for the lifting appli-ances is requested. The attachment of all equipment to thehull structure is covered by classification and it is to be docu-mented that the resulting loads on the hull are based on wirebreaking strength of used wires during installation.

Figure 2 : Example of classification limitsFlare tower

Main deck

Limit of classification

Excluded of classification

Included in classification

Typical riser porche

Limit of classification

Excluded of classification

Included in classification20 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Pt D, Ch 1, Sec 11.6.4 Lifting appliances - Additional class notationsALP, ALM and ALS

The additional class notations ALP, ALM and ALS may beassigned to units equipped with cranes and other liftingappliances meeting the corresponding requirements of theNR 184 Rules for the Classification and Certification ofLifting Appliances of Ships and Offshore Units and NR526Rules for the Classification and Certification of Cranes onboard Ships and Offshore Units.

When no additional class notation for lifting appliances isgranted, the classification covers only the crane pedestaland its foundation welded to the hull and based on loadsspecified by the designer. If the crane pedestal and its foun-dation are welded to a classed topside structure covered bythe notation PROC, this pedestal and its foundation is cov-ered by class for the specific loads provided by the designer.

When the additional class notations ALP, ALM and ALS aregranted and the crane pedestal is partially or completelysupported by a topside structure which is not covered byclass (notation PROC not requested), then the crane pedes-tal and its foundation are not covered by class. In case thispedestal is connected to the topside structure and extendedto the hull, then only the part of the pedestal connected tothe hull is classed for specific loads provided by the ship-yard.

The structure calculation for the crane pedestal and its foun-dation is to be submitted to the Society for information ifnot requested otherwise for classification.

Note 1: For additional class notations ALP, ALM or ALS, the con-struction mark as defined in Pt A, Ch 1, Sec 2 is required.

1.7 Classification and towing / transit

1.7.1 GeneralThe towing or sailing by means of own propulsion system,between constructing shipyard and intended site is coveredby classification requirements. It is recommended to flagthe unit for the tow and mandatory in international watersand when people onboard. Attention is to be paid to com-pliance with international codes and standards as requiredby National Authorities.

In accordance with the provisions of classification, any tem-porary conditions during fabrication, load out, intermediatetowing between two construction sites before completefinalisation of the unit and final load out of topside modulesare considered beyond scope of classification unless spe-cific demand has been received from the party applying forclassification.

1.7.2 Transit and navigation notationsAs a rule, when a navigation notation completes the transitnotation of the unit, classification minimum criteria arescantlings as for a trading ship under the relevant navigationnotation, for the specified draught and loading conditionsduring towing/transit. Requirements given in the Ship Rulesfor the corresponding navigation notation are to be com-plied with.

1.7.3 Environmental conditions for towing/transitThe Society may require detailed documentation for theintended route between the construction shipyard andintended site. Depending on the severity of this route, theplanned time of the year and duration for the tow, furtherinvestigation of slamming loads, green waters, bow impactand ice loads, if any, may be required.

Extreme loads for towing/transit are to be taken by defaultfor a return period of 10 years (typically referred to by aprobability level of 107,7). Different values may be consid-ered if specified by the party applying for classification.

Limitations on sea heading (avoidance of beam seas)including possible seasonal limitations must be defined bythe Owner and/or party applying for classification.

1.7.4 Fatigue strength during towing/transitThe Society reserves the right to require direct fatigue analy-sis for structural members as result of the towing/transit.Such fatigue analysis is to be combined with the overallfatigue verification following the unit in operation.

Standard practice is to apply the Rule criteria for tradingships limited to simplified assessment of side shell stiffenersensuring that the contribution of towing time in regards tofatigue damage is limited.

1.7.5 Temporary mooring during towing/transitThe floating unit is to be equipped with temporary mooring(anchoring) equipment during the towing/transit operation.This equipment may be removed when the unit is perma-nently moored at the operation site.

1.7.6 Emergency towing arrangementAs a rule, the floating unit is to be equipped with an Emer-gency Towing Arrangement (ETA) as per IMO Resolution forseagoing tankers of same size.

Note 1: ETA is required in case the floating unit does not have to bemoved from site, in circumstances where, likely, emptying andcleaning of tanks are not made. Alternatively, towing brackets oroffloading hose brackets may be increased in strength to meet thisrequirement.

2 Rule application

2.1 Unit parts

2.1.1 The various Sections of the present Chapter are to beapplied for the scantling and arrangement of unit partsaccording to Tab 3.

Table 3 : Sections applicable forthe scantling of unit parts

PartApplicable Sections or Articles

General Specific

Fore part Ch 1, Sec 1 Ch 1, Sec 2 Ch 1, Sec 3 Ch 1, Sec 4 Ch 1, Sec 9

Ch 1, Sec 8, [3]

Central part Ch 1, Sec 6 Ch 1, Sec 7

Aft part Ch 1, Sec 8, [4]April 2010 Bureau Veritas Rules for the Classification of Offshore Units 21

Pt D, Ch 1, Sec 12.2 Other items

2.2.1 The various Sections of the present Chapter are to beapplied for the scantling and arrangement of other unititems according to Tab 4.

Table 4 : Sections applicable forthe scantling of other items

3 Statutory requirements

3.1 General

3.1.1 Project specificationPrior to commencement of the review of drawings, thecomplete list of Rules, Codes and Statutory Requirements tobe complied with must be submitted for information. Thislist is to detail the requirements to be complied with:

International Rules

Flag state requirements

Coastal state requirements

Owner standards and procedures

Industry standards

Classification notations.

The project specification is also to specify the list of Ownerrequested statutory certificates.

3.1.2 Conflict of RulesIn case of conflict between the Classification Rules and anyStatutory Requirements as given by Flag state or CoastalState, the latter ones are to take precedence over therequirements of the present Rules.

3.2 International Convention on Load Lines

3.2.1 ApplicationCompliance with the Load Line Convention may berequired by Owner, Flag and/or Coastal State.

The Load Line Convention is in general applicable to unitswith structural and service notations as given in [1.2.1] forthe towing phase. In case the unit has a flag when in serviceat site, application of the Load Line Convention may resultin issuance of Load Line Certificate.

Application of ILLC has impact on stability requirements,see Ch 1, Sec 2.

3.2.2 ILLC at siteThe Society verifies that the maximum draught of the unit isequal to or less than the draught derived from the calcula-tion of the geometrical freeboard as given by the Load LineConvention and calculated as tanker.

Operating draughts exceeding the maximum draught asgiven by this Convention may be accepted in special casesbased on the severity of the environmental conditions andprovided approval by Coastal state and/or Flag state.

3.3 MARPOL 73/78

3.3.1 ApplicationAlthough not mandatory for units covered by present Chap-ter, parts of the requirements in these Offshore Rules aresimilar to the ones in MARPOL and have to be compliedwith.

The Society recommends to apply the Guidelines for appli-cation of MARPOL Annex 1 requirements to FPSOs andFSUs as issued by IMO as document MEPC/Circ.406.

Compliance with MARPOL (in particular Annex 1, Rules13F and 13G) may be required by Owner, Flag and/orCoastal State.Note 1: MARPOL Annex 6 is generally applicable.

3.4 SOLAS

3.4.1 ApplicationAttention is drawn to the fact that SOLAS requirements maybe applicable to the units covered by the present documentat the request of competent authorities.

The provisions of the present Rules do not cover all SOLASrequirements.

3.5 IMO MODU

3.5.1 ApplicationCompliance with MODU may be required by Owner, Flagand/or Coastal State.

The Society reserves the right to refer to the requirements inMODU for fire fighting equipment for the helideck installa-tion.

4 Symbols and definitions

4.1 General

4.1.1 Unless otherwise specified, the units, symbols, defini-tions and reference co-ordinate system given in Pt B, Ch 1,Sec 2 of the Ship Rules remain applicable.

4.2 Definitions

4.2.1 Floating production unitsA floating production unit (FPU) is a unit fitted with process-ing equipment, as necessary to perform basic treatment (de-watering, degassing, gas compression, etc.) of hydrocarbonsreceived from wells, prior to storage and/or export.

Item Applicable Article

Superstructures and deckhouses Ch 1, Sec 8, [5]

Station keeping Ch 1, Sec 8, [1]

Topside Ch 1, Sec 8, [2]

Helicopter decks Ch 1, Sec 8, [6]

Boat landing Ch 1, Sec 8, [7]

Fore and aft parts Ch 1, Sec 8, [3] Ch 1, Sec 8, [4]

Hull outfitting Ch 1, Sec 8, [7]22 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Pt D, Ch 1, Sec 14.2.2 Floating storage unitsA floating storage unit (FSU) is a surface unit intended forstorage in bulk of liquid cargoes as defined in [4.2.14].

4.2.3 Floating storage and offloading unitsA floating storage and offloading unit (FSO) is a unit fittedwith equipment for offloading stored hydrocarbons by shut-tle tankers, moored alongside or in tandem mode.

Note 1: Export may alternatively be performed by an export flow-line leading to another offshore installation (e.g. a loading buoy).

4.2.4 Floating production, storage and offloadingunits

Production and storage installations may be combined intoa floating production and storage unit (FPSU) or into a float-ing, production, storage and offloading unit (FPSO).

4.2.5 Station keepingA floating production and/or storage unit may be kept inposition:

either by means of a Single Point Mooring to which sheis moored or articulated, or

by means of an independent anchoring system, or

by means of a dynamic positioning system.

When provided, the anchoring system may consist of aspread mooring system, or a turret system.

The mooring system may be a disconnectable system, e.g.for units located in typhoon areas, which have kept theirship propulsion and steering appliances and can sail way incase of typhoon, or for units located in iceberg lanes.

An auxiliary propulsion system (thruster) may be fitted, e.g.to assist weathervaning, or to provide a minimum manoeu-vrability to the unit, when disconnected.

4.2.6 Ship RulesFollowing [1.2.3], when Ship Rules are mentioned in thepresent document, reference is made to Rule Note NR467Rules for the Classification of Steel Ships. The applicablerequirements are those for ships greater than 65 m inlength. The designer has to contact the Society for informa-tion about the latest applicable version of these Rules.

4.2.7 Rule lengthFor an offshore service unit with propulsion system, the rulelength L is determined similarly to seagoing oil tankers (seeShip Rules). In case of units without rudder shaft, the rulelength L is to be taken equal to 97% of the extreme length atthe maximum draught.

The extreme length at the maximum draught is not toinclude external turret system or boat landing platformspossibly attached to the extreme ends.

4.2.8 Hull and superstructuresThe hull is a barge shaped floating structure with overalldimensions in accordance with Pt B, Ch 5, Sec 2 of the ShipRules. The purpose is to store oil (if applicable), ballast andproduction liquids. In addition, there are dedicated machin-ery spaces provided for essential generators, etc.

The definition of the hull includes the living quarters, whichare to be designed and built in accordance with the relevantrequirements for superstructures as given by Ship Rules.See also Ch 1, Sec 4, [2.1].

The hull includes supports for pertinent features of hullstructure design, named attachments and appurtenancesin these rules, as for example hull topsides supports andfoundations. The interface point is the bearing and slidingsupports of the topside modules.

4.2.9 TopsidesA topside structure is usually an independent structure posi-tioned on the deck of the floating unit which typically is thefreeboard and strength deck. Depending the supportingarrangement, provisions are to be taken for possible effectsof longitudinal stress and deformation from hull girder inthe topsides structure. Topsides equipment may containessential marine systems which are within scope of classifi-cation. The Society may require detailed documentation tobe submitted for information.

The topsides are usually arranged in modules to ease fabri-cation, installation and to reduce impact from longitudinalstress in hull girder of the floating unit.

4.2.10 Maximum and minimum draughtThe draught is the distance, in m, from the base line to thewaterline, measured amidships.

The maximum draught is the deepest draught that can beobserved at site during operation.

The minimum draught is the lightest draught that can beobserved at site during operation.

4.2.11 Towing/transit draughtFor any towing/transit phase, a maximum and minimumdraught are to be determined by the designer andreflected in the associated loading conditions.

4.2.12 Fore and aft partsThe fore part and aft part are determined on a case-by-casebasis, according to the main wave heading.

4.2.13 Splash zoneThe splash zone is the zone of the floating structure whichis alternatively in and out of water due to wind, wave andmotions. Surfaces which are wetted only during majorstorms are excluded from the splash zone.

The exact location and vertical extent of the splash zone isto be determined at the design stage as function of the envi-ronmental conditions at the intended site.

Unless otherwise indicated by the designer, the splash zoneis usually considered as extending from 3 m below the low-est operational draught to 5 m above the maximum loadeddraught.

Corrosion in the splash zone during service is to be control-led by means of protective coating systems and/or corrosionmargins and thickness increments on plating.April 2010 Bureau Veritas Rules for the Classification of Offshore Units 23

Pt D, Ch 1, Sec 14.2.14 CargoFor the application of this chapter, cargo means all the oil-like liquids in relation with the drilling and process (produc-tion) operation and includes also all the flammable liquidshaving a flash point of less than 60C stored in bulk in cargotanks of the unit.

4.2.15 Corrosion additionThickness to be added to the net thickness in view of corro-sion allowance as defined in Ch 1, Sec 3, [4].

4.2.16 Thickness incrementThickness that may be added to the gross thickness inaccordance with Ch 1, Sec 3, [5].

4.3 Reference co-ordinate system

4.3.1 The ships geometry, motions, accelerations and loadsare defined with respect to the following right-hand co-ordi-nate system (see Fig 3):

Origin: at the intersection among the longitudinal planeof symmetry of ship, the aft end of L and the baseline

X axis: longitudinal axis, positive forwards

Y axis: transverse axis, positive towards portside

Z axis: vertical axis, positive upwards.

Positive rotations are oriented in anti-clockwise directionabout the X, Y and Z axes.

Figure 3 : Reference co-ordinate system

5 Calculations

5.1 Calculations to be submitted

5.1.1 ProceduresProcedures and assumptions taken for structural and hydro-dynamic calculations requested by the Rules are to be sub-mitted to the Society for review prior to submission of finalreport with conclusions of the analysis.

The following procedures must be submitted:

Hydrodynamic calculations

- direct calculation report

- model tests report and calibration report, if relevant

Finite element calculations:

- primary supporting members of cargo tanks

- topside supports

- turret supports

- spread mooring seats

- fatigue structural details

- topsides, if relevant

- as a rule, spectral fatigue

Additional calculation procedures for information:

- dropped object analysis procedure

- collision analysis procedure

- explosion analysis procedure.

Calculation of design temperature of structural ele-ments, if relevant (see Ch 1, Sec 3)

Detailed documentation of software used, demonstratingcalculation accuracy, may be requested by the Society.

5.1.2 Calculation reportThe calculation report is to follow the procedure asdescribed and agreed to prior to commencement of thestudy. Input data, considerations for decision of boundaryconditions and detailed stress results must be available.

Finite element models usually consist of plate elements.Normal and shear stresses are usually obtained in the centreof the element and stress plots are to show element stressesand not a node average.

Graphically information for several loading conditions is toshow deformation of structure, numerical stresses and VonMises values.

6 Design criteria and data

6.1 General

6.1.1 The party applying for classification is to provide theSociety with the classification data and assumptions.

Relevant information is entered in the Design Criteria State-ment.

6.2 Site data

6.2.1 The party applying for classification is to specify thesite at which the unit will operate, and is to provide relevantdesign data and background information.Note 1: The case of a unit intended for several sites, or of a unit notbeing a permanent installation, is specially considered.

6.3 Operating loading conditions

6.3.1 GeneralThe data on unit operation are to include the informationrequired in [6.3.2] to [6.3.5].

6.3.2 Cargoes and processed productsCharacteristics of processed hydrocarbons and cargointended to be stored (in particular H2S content).

Z

X

Y

AE24 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Pt D, Ch 1, Sec 16.3.3 Environmental conditions

a) Extreme environmental conditions during unit's opera-tion.

b) Most severe environmental conditions, if relevant, dur-ing offloading operations towards a shuttle tanker,moored alongside or in tandem mode.

c) Limiting conditions before the disconnection from sin-gle point mooring, if relevant.

d) Most severe environmental conditions, if relevant, dur-ing maintenance operations such as dismantling of mainbearings of connection with single point mooring.

e) Environmental conditions during towing/transit fromconstruction/conversion location to offshore site, whennot covered by a navigation notation.

6.3.4 Loads

a) loads induced by connection to a Single Point Mooring,if any, in all relevant conditions detailed in [6.3.3],including:

loads in bearings, in case of arm and yoke connec-tions

loads on secondary bearings during maintenanceoperations

b) hawser loads, in case of connection by a hawser

c) maximum loads induced by shuttle tankers

d) loads induced by process and other equipment.

6.3.5 Ship loading conditionThe following are to be considered:

a) loading conditions in normal operations, including dis-tribution of stored hydrocarbon, ballast, stores and oth-ers, for the full sequence of loading-unloading of theunit

b) loading conditions in any other particular condition ofoperation of the unit, such as light ballast, or tank clean-ing/inspection, and related limiting condition for envi-ronment

c) loading condition for towing/transit.

Note 1: For control of loadings during operation, refer to Ch 1, Sec5, [2.3].

7 Documentation to be submitted

7.1

7.1.1 The documentation to be submitted is to include thefollowing information, in addition to what is specified inPart A, Chapter 1:

a) Design criteria and data, as defined in [6]

b) Data for hydrodynamic analysis:

lines plan and appendices on hull

environmental data as required in Pt B, Ch 2, Sec 2

properties of the unit related to the assessment ofwind and current loads (areas, coefficients), when aheading analysis is performed (see Ch 1, Sec 4)

relevant information and properties of mooring sys-tem

loading manual with description of each loadingcondition

c) General drawings:

general arrangement of the unit, showing, as rele-vant:

- the location of storage tanks with their openings,ballast tanks, cofferdams and void spaces,accesses to hazardous and safe spaces, cargostorage and production piping and vent pipingon the open deck, bow or stern transfer lines,etc.

- general arrangement of process, utility and con-trol spaces

- general arrangement of risers, riser supports, andmanifolds

general arrangement of hazardous areas

flare radiation level plots

arrangement of the fore and aft spaces

general arrangement of the mooring system, or SPMconnection

d) Structural drawings, specifications and supporting docu-ments:

booklet of loading conditions

mooring systems foundations (fairleads, tensioners,winches, bollards, etc.) where applicable

for a floating unit connected to a single point moor-ing by an arm or yoke, connections and supportingstructure

turret structural and mechanical drawings

riser supports

foundations of deck modules and flare, if any,together with corresponding loads

deck modules, as relevant

flare structure

specification of coatings and drawings of cathodicprotection, including outside hull and inside oftanks, with drawings of anode securing devicesApril 2010 Bureau Veritas Rules for the Classification of Offshore Units 25

Pt D, Ch 1, Sec 1e) Machinery and piping drawings:

oil and gas processing plant (general arrangement,PID)

cargo offloading equipment

gas disposal system

diagrammatic cargo and gas piping systems, includ-ing offloading piping

connections to risers

diagrammatic drawing of stripping system of coffer-dams, pump rooms and other spaces within the stor-age area

diagrammatic drawing of cargo tank vent systems

specification of pumps, valves, expansion joints andother cargo piping fittings

drawing of cargo pump shaft stuffing boxes at bulk-head penetrations

arrangement of gastight bulkhead penetrations

bilge and drainage systems for hazardous areas

ballast pumping within storage area

remote control of cargo and ballast pumping systems

specifications and drawings of cargo hoses

cargo tank heating system

crude oil tank washing systems, together with speci-fication of equipment

arrangements for gas-freeing of cargo tanks

drawings of product swivels

drawings of electrical swivels

arrangements for venting cargo tanks, includingspecification of venting fittings

pressure-vacuum valves

arrangement and capacity of air ducts, fans andmotors in storage area, together with justification oftheir anti-sparking properties

rotating parts and casings of fans

level-gauging arrangements, including drawings andspecifications

emergency shut down system remote control and monitoring systems, including

specifications of instrumentation arrangement of instrumentation in control stations

f) Inert gas installations: single-wire diagram of the installation, together with

main characteristics: capacity, pressure, tempera-ture, O2 content, water content

list of the components with their characteristics:pipes, scrubber, blowers, non-return devices, valves,pumps, protective devices for overpressure and vac-uum

drawing of arrangement of installation on board diagram of monitoring and alarm systems specifications of O2 analyser, recorder and portable

control instruments

g) Safety plans: drawing and specification of fire and gas detection

systems fire protection details in accommodation area pressure water fire main fire extinguishing systems in machinery and accom-

modation areas foam extinguishing systems within storage area: dia-

grammatic arrangement drawing, calculation note,foam agent specification, characteristics of foammonitors and hoses

fire extinguishing system in cargo pump rooms: gen-eral arrangement and calculation note

fire extinguishing system in process area

h) Others: documents relevant to contemplated additional

class notations, as specified in the Rules.26 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Pt D, Ch 1, Sec 2SECTION 2 SUBDIVISION AND STABILITY

1 General

1.1 Application

1.1.1 The present Section defines the subdivision and sta-bility requirements, with respect to risks of capsizing orrisks of pollution of the sea for units covered by the presentChapter (see Ch 1, Sec 1, [1.2.1]) and intended to receivethe service notation oil storage.

1.1.2 Units covered by the present Chapter but notintended to receive the service notation oil storage are tocomply with the requirements of Part B, Chapter 1insteadof the present Section.

1.1.3 Provisions of the Ship Rules applicable to oil tankersare also applicable to units intended to be granted a nota-tions including oil tanker ESP / offshore service ship.

2 Stability

2.1 General

2.1.1 Partially filled tanks

The free surface effects of partially filled tanks are to betaken into account in the stability calculations. Fillingrestrictions entered in the operating manual are to be givenspecial consideration by the Society.

2.1.2 Documentation to be submitted

A stability file is to be submitted by the Owner or its repre-sentative. It has to include line plans, capacity plans, justifi-cation of lightship characteristics, definitions of loadingconditions, damage stability booklet, etc.

2.2 Intact stability

2.2.1 General

The requirements of Pt B, Ch 3, Sec 2 of the Ship Rules con-cerning the intact stability are to be complied with. In addi-tion, the following requirements are applicable:

a) For inclining test and lightweight check:

The unit is to comply with the requirements of Pt B, Ch 3,App 1 of the Ship Rules.

b) For trim and stability booklet:The information that is to be included in the trim andstability booklet is given in Pt B, Ch 3, App 2, [1.1] ofthe Ship Rules.

The loading conditions to be checked are given in[2.2.2].

c) In addition to the requirements of Pt B, Ch 3, Sec 2 ofthe Ship Rules, the criteria of Pt D, Ch 7, Sec 3, [1.2] ofthe Ship Rules are to be complied with.

2.2.2 Loading conditionsThe following conditions are to be submitted:

lightship condition transit/towing condition

selected operational loading conditions covering fore-seen fillings of the cargo tanks. One of the conditionsmust correspond to the maximum draught.For the assignment of a tropical freeboard, the corre-sponding loading condition has also to be submitted

loading conditions for inspection of the cargo tanks,where one or two consecutive cargo tanks are empty (tobe consistent with operational practice).

2.3 Damage stability

2.3.1 GeneralThe unit is to comply with the requirements of Pt D, Ch 7,Sec 3, [1.3] of the Ship Rules which are similar to the onesin MARPOL.

However the extent of damage given in Pt D, Ch 7, Sec 3,Tab 1 of the Ship Rules is not fully applicable. The Table isto be replaced by the prescriptions given in [2.3.2].

2.3.2 Extent of damageFor the units covered in the present Chapter, the extent ofdamage on the bottom is disregarded.

The assumed extent of damage on the side shell is to be asfollows:

longitudinal extent lc:

lc = 1/3 LLL2/3 or 14,5 m, whichever is the lesser

transverse extent tc measured inboard from the side shellplating, at right angle to the centerline, at the level ofsummer load line:

tc = B/5 or 11,5 m, whichever is the lesser

vertical extent vc, from the moulded line of the bottomshell plating at centerline: upwards without limit.

2.3.3 Type A freeboardFor units assigned with a type A freeboard, the requirementsof Pt B, Ch 3, App 4 of the Ship Rules, which are similar tothe ones in ILLC 66, are also to be complied with.April 2010 Bureau Veritas Rules for the Classification of Offshore Units 27

Pt D, Ch 1, Sec 23 General arrangement of oil storageunits

3.1 General

3.1.1 The requirements of Article [3] are additional to, orreplace, in case of conflict, those of Part C, Chapter 4.

3.2 Definitions

3.2.1 Storage area

The storage area is that part of the unit which contains cargotanks as well as slop tanks, storage pump rooms, includingany other rooms or spaces adjacent to storage tanks or sloptanks as well as deck areas throughout the entire length andbreadth of the unit above the mentioned spaces.

3.2.2 Units manned end

Unit's manned end is the end of the unit where accommo-dation is located.

Note 1: In the case of most tankers converted into storage units orstorage and accommodation units, manned end has the samemeaning than aft end.

3.2.3 Units forward end

Unit's forward end is defined as:

forward end, as usually considered, for floating unitsintended to receive a combination of service and struc-tural type notations including tanker/offshore serviceship, irrespective of the end connected to a single pointmooring, if any

for newbuild barges articulated or moored to a singlepoint mooring, the end next to this single point mooring

for other units, the end constituting the forward end dur-ing towage.

3.2.4 Production equipment

Throughout the present Chapter, production equipmentmeans equipment (piping and accessories, valves, pumps,pressure vessels, etc.) containing or liable to contain hydro-carbon products under treatment, excluding transfer fromthese production installations.

3.2.5 Cargo pump room

A cargo pump room is a space containing pumps and theiraccessories for the handling of cargo.

3.2.6 Pump room

A pump room is a space, possibly located in the storagearea, containing pumps and their accessories for the han-dling of ballast and oil fuel, or other supplies, cargo beingexcluded.

3.2.7 Void space

A void space is an enclosed space in the storage area exter-nal to a cargo tank, except for hold space, cargo pump room,pump room, or any space normally used by personnel.

3.2.8 Other spaces

For definition of other spaces, refer to Part C, Chapter 4.

3.2.9 Independent piping system

An independent piping system designates a piping systemfor which no potential connection to other piping systems isavailable.

3.2.10 Separate piping system

A separate piping system designates a piping system whichis not permanently connected to another piping system.This separation may be achieved by detachable spoolpieces and valves and suitable blind flanges, or two specta-cle flanges arranged in series with means between the twospectacles flanges to detect leakage.

Operational separation methods are normally not to beused within a cargo tank.

3.3 Cargo tanks

3.3.1 Segregation requirements

Cargo tanks and slop tanks are to be segregated fromaccommodation, service and machinery spaces, drinkingwater and stores for human consumption by means of a cof-ferdam, or any other similar space.

3.3.2 Ends of storage area

A cofferdam or similar compartment is normally to be pro-vided at both ends of the storage area. Such a cofferdam isto be bounded by oil-tight bulkheads 760 mm apart as aminimum and extending from keel to deck across the fullbreadth of the unit.

3.3.3 Double bottom

Double bottoms adjacent to cargo oil tanks are not to beused as oil fuel bunkers.

3.3.4 Arrangement of tanks

The size and arrangement of cargo tanks and ballast tankslocated in the storage area are to comply with the applica-ble provisions of Article [2].

3.3.5 Fore and aft peaks

Cargo is not to be loaded in fore or aft peaks.

After special examination by the Society, newbuild floatingunits may be given a dispensation from the installation of acollision bulkhead or aft peak bulkhead provided that thecorresponding extremity is efficiently protected by an SinglePoint Mooring articulated to the unit.28 Bureau Veritas Rules for the Classification of Offshore Units April 2010

Pt D, Ch 1, Sec 23.4 Location and arrangement of spacesadjacent to storage area

3.4.1 Machinery spacesAll machinery spaces are to be separated from cargo andslop tanks by cofferdams, cargo pump rooms, oil fuel bun-kers or permanent ballast tanks.

However, the lower portion of the pump room may berecessed into the machinery spaces of category A to accom-modate pumps provided that the deck head of the recess isin general not more than one third of the moulded depthabove the keel. In the case of units of not more than 25000tonnes deadweight, where it can be demonstrated that forreasons of access and satisfactory piping arrangement this isimpracticable, the Society may permit a recess in excess ofsuch height, but not exceeding one half of the mouldeddepth above the keel.

3.4.2 Ballast pump roomsPump rooms containing pumps and their accessories for thehandling of ballast for spaces adjacent to cargo tanks andslop tanks and pumps for fuel oil transfer may be consid-ered as equivalent to a cargo pump room for the applicationof [3.4.1] and Ch 1, Sec 10, [1.4], provided that such pumprooms fulfil the safety requirements applicable to cargopump rooms.

The lower portion of pump rooms may be recessed into cat-egory A machinery space to accommodate pumps, pro-vided that the deck head of the recess is not more than onethird of the moulded depth above the keel.

3.4.3 Process and utilityProcess and utility spaces may be located above main deckin the storage area.

Utility and control spaces, and other enclosed spaces,which are not themselves hazardous areas, are to be sepa-rated from deck by a distance of 3 m minimum, or by a cof-ferdam.

3.4.4 Accommodation, control and service spacesAccommodation spaces, main cargo oil control stations,control stations and service spaces (excluding isolatedcargo handling gear lockers) are to be positioned outsidethe storage area and cofferdams or other spaces (crude oilpump rooms, oil fuel bunkers or permanent ballast tanks)considered as equivalent isolating cargo oil or slop tanksfrom machinery spaces.

Note 1: A recess provided in accordance with [3.4.2] need not betaken into account when the position of these spaces is being deter-mined.

3.5 Cargo pump rooms

3.5.1 Glazed ports in bulkheads

a) The cargo pump rooms are to be separated from theother spaces of the unit by oil tight bulkheads and arenot to have any direct access to the machinery spaces.

b) Glazed ports can be provided in the bulkhead separat-ing the cargo pump room from machinery spaces pro-vided they satisfy the following conditions:

they are to be sufficiently protected from mechani-cal damage

strong covers are to be permanently secured on themachinery compartment side

glazed ports are to be so constructed that glass andsealing are not damaged by any deformations of theunit

the glazed ports are to be so constructed as to main-tain the structural integrity and the bulkhead resist-ance to fire and smoke.

3.5.2 Bulkhead penetrationsThe number of penetrations through the bulkhead separat-ing the cargo pump room from the machinery spaces is tobe k