Classification of Lifting Units - Marine & Offshore · Classification of Lifting Units . January 2015. Rule Note . NR 608 DT R00 E . Marine & Offshore Division . 92571 Neuilly sur

Classification of Lifting Units

January 2015

Rule Note NR 608 DT R00 E

Marine & Offshore 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]

2015 Bureau Veritas - All rights reserved

ARTICLE 1

1.1. - BUREAU VERITAS is a Society the purpose of whose Marine & Offshore Division (the "Society") isthe classification (" Classification ") of any ship or vessel or offshore unit or structure of any type or part ofit or system therein collectively hereinafter referred to as a "Unit" whether linked to shore, river bed or seabed or not, whether operated or located at sea or in inland waters or partly on land, including submarines,hovercrafts, drilling rigs, offshore installations of any type and of any purpose, their related and ancillaryequipment, subsea or not, such as well head and pipelines, mooring legs and mooring points or otherwiseas decided by the Society.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 2

2.1. - 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 a collection of minimum requirements but not a standard or a code of construction neither aguide for maintenance, a safety handbook or a guide of professional practices, all of which areassumed to be known in detail and carefully followed 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 of ran-dom inspections and do not in any circumstances involve monitoring or exhaustive verification.

ARTICLE 44.1. - 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 5

5.1. - 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 provided for.

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.

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 6

6.1. - 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 or their omission cause to the Client a damage which is provedto be the direct and reasonably foreseeable consequence of an error or omission of the Society,its liability towards the Client is limited to ten times the amount of fee paid for the Service havingcaused the damage, provided however that this limit shall be subject to a minimum of eight thou-sand (8,000) Euro, and to a maximum which is the greater of eight hundred thousand (800,000)Euro and one and a half times the above mentioned fee. These limits apply regardless of fault in-cluding breach of contract, breach of warranty, tort, strict liability, breach of statute, etc.The Society bears no liability for indirect or consequential loss whether arising naturally or not asa consequence of the Services or their omission such as loss of revenue, loss of profit, loss of pro-duction, loss relative to other contracts and indemnities for termination of other 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 7

7.1. - 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 8

8.1. - 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 which have 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 reports can be handed over to another Classification Society, where appropriate, in case of the Unit's transfer of class;

• "the data relative to the evolution of the Register, to the class suspension and to the survey status of the Units, as well as general technical information related to hull and equipment damages, may be passed on to IACS (International Association of Classification Societies) according to the association working rules;

• "the certificates, documents and information relative to the Units classed with the Society may be reviewed 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 10

10.1. - 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 11

11.1. - 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, or to another Court as deemed fit by the Society.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 13

13.1. - 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. They are not var-ied by any purchase order or other document of the Client serving similar purpose.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 L - 7 January 2013

MARINE & OFFSHORE DIVISIONGENERAL CONDITIONS

RULE NOTE NR 608

NR 608Classification of Lifting Units

SECTION 1 GENERAL

SECTION 2 GENERAL ARRANGEMENT

SECTION 3 STABILITY AND SUBDIVISION

SECTION 4 STRUCTURAL ASSESSMENT

SECTION 5 MACHINERY AND SYSTEMS

SECTION 6 ELECTRICAL INSTALLATIONS AND CONTROL

SECTION 7 SAFETY FEATURES

SECTION 8 INSPECTION AND TESTING

January 2015

Section 1 General

1 General 5

1.1 Application1.2 Scope1.3 Exclusion1.4 Class notation1.5 Applicable rules

2 Lifting equipment 5

2.1 General2.2 Certification of the lifting equipment2.3 Subsea lifting

3 References 6

3.1 Acronyms3.2 Definitions3.3 Referenced documents

4 Documents to be submitted 7

4.1 General4.2 Lifting equipment documentation

Section 2 General Arrangement

1 General 9

1.1 Location of lifting appliances and lay down areas1.2 Position of the crane during navigation

Section 3 Stability and Subdivision

1 General 10

1.1 Application1.2 Purpose of the stability check1.3 Loading conditions1.4 Trim and stability booklet

2 Intact stability 11

2.1 General2.2 Operational limitations2.3 Intact stability criteria during lifting operation2.4 Weather criteria during lifting operation2.5 Intact stability criteria in the event of sudden loss of the lifted load2.6 Intact stability criteria for crane overload test

2 Bureau Veritas January 2015

Section 4 Structural Assessment

1 General 14

1.1 Application1.2 Foundations of the lifting appliance and hull reinforcements1.3 Overload consequence

2 Hull structural arrangement 14

2.1 Principles

3 Hull girder strength 14

3.1 Principles3.2 Hull girder loads3.3 Torsional moment

4 Lifting equipment foundation 15

4.1 General4.2 Mobile lifting appliance4.3 Loading conditions4.4 Design hoisting loads4.5 Environmental loads4.6 Hull girder loads4.7 Material strength

5 Allowable stress 16

5.1 Allowable stress for lifting operations5.2 Allowable stress for transit conditions

6 Buckling 17

6.1 Buckling check for lifting operations6.2 Buckling check for transit conditions

7 Fatigue 17

7.1 Fatigue check for lifting operations7.2 Fatigue check for transit conditions7.3 Fatigue check of hull structure

8 Connection of the lifting equipment on the foundation 17

8.1 Connecting bolts

Section 5 Machinery and Systems

1 General 18

1.1 Application1.2 Essential service

2 Position keeping 18

2.1 General2.2 Dynamic positioning

January 2015 Bureau Veritas 3

Section 6 Electrical Installations and Control

1 General 19

1.1 Application1.2 Essential service1.3 Hazardous areas

2 Power supply 19

2.1 General

3 Lifting equipment controls 19

3.1 General3.2 Overload prevention3.3 Emergency system3.4 Communication means

Section 7 Safety Features

1 General 20

1.1 Application1.2 Overload protection system

Section 8 Inspection and Testing

1 General 21

1.1 Application1.2 In-service survey

2 Onboard testing 21

2.1 Lifting installations


NR 608, Sec 1

SECTION 1 GENERAL

1 General

1.1 Application

1.1.1 The present Note provides requirements for the clas-sification of ships or offshore units intended to perform lift-ing operations at sea.

1.1.2 The present Note applies to ship and offshore unitsintended to be granted the service notation lifting.

1.2 Scope

1.2.1 The present Note addresses the requirements regard-ing the installations on the ship or offshore unit providingthe lifting equipment with auxiliary functions (power sup-ply, communication means, station keeping capabilitiesetc), the stability criteria for lifting operations and therequirements for the structural assessment of the founda-tions of the lifting equipment.

1.2.2 The extent of the structural assessment is defined inSec 4, [1].

1.2.3 Relations between the classification of the ship or off-shore unit and the certification of the lifting equipment arespecified in [2].

1.2.4 The requirements for the certification of the liftingequipment are not in the scope of the present Note.

1.3 Exclusion

1.3.1 This Rule Note does not cover the following vesseltypes:• vessels granted with the notation Pontoon - crane which

are to comply with Ship Rules, Part A• vessels granted with lifting equipment used for drilling

operations• semi-submersible heavy lift transport vessels.

1.4 Class notation

1.4.1 Service notationThe present Note provides the requirements for the classifi-cation of vessels for which the service notation lifting isassigned.

1.4.2 Additional class notationThe lifting appliance is to be certified as required in [2.2].

One or several additional class notations, as listed in Tab 1,are to be assigned to the vessel.

The additional class notations ALM and ALS may beassigned to vessels equipped with cranes and other liftingappliances meeting the corresponding requirements ofNR526, Rules for the Certification of Cranes on board Shipsand Offshore Units.

The additional class notation OHS may be assigned to ves-sels equipped with handling systems meeting the require-ments of NR595, Rules for the Classification of OffshoreHandling Systems.

1.5 Applicable rules

1.5.1 The rules applicable for classification and surveys arespecified in: • NR467 Rules for Steel Ships, Part A or in• NR445 Rules for Offshore Units, Part A,

as applicable.

1.5.2 The requirements applicable to ship or offshore unitshaving the service notation lifting are summarized in Tab 2.

2 Lifting equipment

2.1 General

2.1.1 Lifting applianceThe term lifting appliance is used herein to designate thewhole of the elements used for suspending, raising or low-ering loads or moving them from one position to anotherwhile suspended or supported, for instance a crane and thewhole of its mechanisms.

2.1.2 Offshore handling systemThe term offshore handling system is used to designateequipment such as winches, windlasses, strand jacks, chainjacks, sheaves and their foundations used for pulling of aload. In particular, equipment used for mooring lines andrisers installation are concerned.Compared to lifting appliances, offshore handling systemsmay handle cargos not only subjected to gravity.

Table 1 : Additional class notation

Additional class notation Description Remarks

ALM Lifting appliance used in offshore conditions Reference is made to NR526

ALS Lifting appliance for submarine craft Reference is made to NR526

OHS Offshore handling system Reference is made to NR595


NR 608, Sec 1

Table 2 : Applicable requirements

2.2 Certification of the lifting equipment

2.2.1 The lifting equipment is to be certified and compliantwith the rules of a recognized Classification Society.

2.2.2 Certification of the lifting equipment is independentfrom classification of the ship or offshore unit.

2.2.3 Lifting appliance

Lifting appliances may be granted the class notation ALM orALS as defined in [1.4.2].

2.2.4 Offshore handling system

Offshore handling systems may be granted the class nota-tion OHS as defined in [1.4.2].

2.3 Subsea lifting

2.3.1 Lifting appliances used to perform subsea lifting areto be specially certified to do so. The relevant requirementsof the NR526 or another recognized standard are to becomplied with.

3 References

3.1 Acronyms

3.1.1 The following acronyms are used:

DAF : Dynamic Amplification Factor

MBL : Minimum Breaking Load

RP : Rated Line Pull

SWL : Safe Working Load.

WLL : Working Load Limit

3.2 Definitions

3.2.1 Nominal pulling load

The nominal pulling load of a handling system is defined asthe maximum load which may be pulled by the system in asafe manner, in kN.

When the handling system is a lifting appliance, the nomi-nal pulling load is equivalent to the Safe Working Load.

3.2.2 Safe Working Load (SWL)

The Safe Working Load (SWL), in kN, is defined as the max-imum static load which may be lifted vertically by the appli-ance under normal use and within its geometrical limits.

3.2.3 Rated Line Pull (RP)

The Rated line Pull (RP) of a winch is the maximum ropetension, in kN, that the winch can haul at the relevant layer,in normal service condition, when the drum rotates at itsmaximum service speed.

3.2.4 Working Load Limit (WLL)

The Working Load Limit (WLL), in kN, is defined as themaximum load that a lifting accessory (loose gear) is certi-fied to withstand under normal use and in a given configu-ration.

3.2.5 Static Load

The static load, in kN, corresponds to the sum of the staticmass of the lifted cargo and its rigging, times the gravityacceleration.

3.2.6 Dynamic Amplification Factor (DAF)

The Dynamic Amplification Factor (DAF) is applied on thestatic load to account for the effect of the external forcesdue to vessel motions or sea pressure in case of subsea lift-ing and due to the lifting appliance self-motions.

ItemShips equal to or

greater than 500 GTShips less than 500 GT Offshore Units

General arrangement Sec 2 and NR467, Part B Sec 2 and NR566 Sec 2 and NR445, Part B

Stability Sec 3 and NR467, Part B Sec 3 and NR566 Sec 3 and NR445, Part B

Structural assessment Sec 4 and NR467, Part B or NR600, as applicable Sec 4 and NR445, Part B

Machinery and systems Sec 5 and NR467, Part C Sec 5 and NR566 Sec 5 and NR445, Part C

Electrical installations and automation Sec 6 and NR467, Part C Sec 6 and NR566 Sec 6 and NR445, Part C

Safety features Sec 7 and NR467, Part C Sec 7 and NR566 Sec 7 and NR445, Part C

Materials and welding NR216

Note 1:NR445: Rules for the Classification of Offshore Units (Offshore Rules)NR467: Rules for the Classification of Steel Ships (Ship Rules)NR566: Hull Arrangement, Stability and Systems for Ships less than 500 GTNR600: Hull Structure and Arrangement for the Classification of Cargo Ships less than 65 m and Non Cargo Ships less than 90 mNR216: Rules on Materials and Welding for the Classification of Marine Units (Materials & Welding).


NR 608, Sec 1

3.2.7 Minimum Breaking Load (MBL)

The Minimum Breaking Load of chain, wire ropes and fibreropes are provided by the manufacturer in accordance withNR216.

3.2.8 Geometrical limit

The geometrical limit is the configuration of the liftingappliance for which the SWL is defined.

It is possible to specify several SWL corresponding to differ-ent geometrical limits.

3.2.9 Hazardous areas

Those locations in which an explosive gas-air mixture is:

• continuously present, or present for long periods (zone 0)

• likely to occur in normal operation (zone 1)

• not likely to occur and, if it happens, only existing for ashort time (zone 2).

By default, the classification rules used for the vessel (ShipRules or Offshore Rules) are those to be used for the defini-tion of the hazardous areas onboard.

3.3 Referenced documents

3.3.1 Offshore Rules

Offshore Rules means Rules for the Classification of Off-shore Units (NR445). When reference is made to the Off-shore Rules, the latest version of these Rules is applicable.

3.3.2 Ship Rules

Ship Rules means Rules for the Classification of Steel Ships(NR467).

For ships less than 500 GT, cargo ships less than 65 m ornon cargo ships less than 90 m in length, Rule NotesNR566 and NR600, respectively, replace NR467, asdetailed in Tab 2.

When reference is made to the Ship Rules (or NR566 orNR600, as applicable), the latest version of these Rules isapplicable.

3.3.3 NR216

When reference is made to NR216, the latest version of theRules on Materials and Welding for the Classification ofMarine Units is applicable.

3.3.4 NR526

When reference is made to NR526, the latest version of theRules for the Certification of Lifting Appliances onboardShips and Offshore Units is applicable.

3.3.5 NR595

When reference is made to NR595, the latest version of theRules for the Classification of Offshore Handling Systems isapplicable.

3.3.6 IMO MODU Code

IMO MODU Code means the Code for the Constructionand Equipment of Mobile Offshore Drilling Units, pub-lished by the International Maritime Organization.

3.3.7 API SPEC 2CAPI SPEC 2C means the American Petroleum Institute docu-ment: Specification for Offshore Pedestal-mounted Cranes.

3.3.8 EN 13852EN 13852 means the European Standard document: Cranes- offshore cranes.

4 Documents to be submitted

4.1 General

4.1.1 The documents listed in Tab 3 are to be provided, asa minimum, in addition to the relevant requirementsdefined in the Ship Rules for ships and in the Offshore Rulesfor offshore units.

4.2 Lifting equipment documentation

4.2.1 Technical manualThe technical manual is to contain the user documentationrequired by the technical standard the lifting equipment iscomplying to.

In particular, the technical manual is to contain full infor-mation concerning:

• the crane utilization chart, taking into account the sta-bility and structural limitations for each relevant windand sea state

• all limitations during normal and emergency operations:

• maximum wind and sea state

• maximum heel and trim

• design temperature

• braking systems

• the description of the equipment

• the design technical standard

• the mass and location of centre of gravity of the maincomponents of the lifting equipment

• all safety devices, including overload protection system,when relevant

• the description of the motion compensation system,when relevant

• the user instructions to operate, erect, dismantle andtransport the system

• the factory acceptance tests specification

• the inspection and testing programme of the equipmentwhen installed on-board

• the testing specification of the emergency lowering sys-tem for personnel transfer, when relevant

• the diagrams of electrical, hydraulic and pneumatic sys-tems and equipment

• the materials used in construction, welding proceduresand extent of non-destructive testing

• the planned maintenance system and periodic inspec-tions.

Note 1: The party applying for classification may also refer to theIMO MODU Code Chapter 12 for the description of the manualcontent.


NR 608, Sec 1

4.2.2 Calculation notesCalculation notes including the items listed below are to beprovided for information: • loading conditions and design loads applied on the lift-

ing equipment

• loads lowering in the foundations• structural assessment of the connecting bolts between

the lifting equipment and its foundations.

Table 3 : Documents to be submitted

No. Documents to be submitted I / A (1)

1 Lifting operational restrictions (lifting diagram, limiting environmental conditions, …) I

2 Lifting appliance documentation:• technical manual• calculation notes

I

3 General arrangement of the unit showing the lifting equipment position during transit and lifting operations A

4 General arrangement of the lifting equipment

Stability

5 Loading conditions during transit and lifting operations A

6 Trim and stability booklet as defined in Sec 3 A

Structural assessment

7 Structural arrangement showing the foundations of the lifting equipment and the hull structure reinforce-ments

A

8 Scantlings and steel grades of the connecting bolts between the lifting equipment and its foundations I

9 Structural arrangement of the supporting and locking devices used for transit conditions A

10 Material specification of the foundations of the lifting equipment A

11 Cargo securing manual and lashing arrangement (2) A

12 Welding procedure, welding book of the foundation A

Machinery

13 Ballast system diagram when counter ballast is used A

14 Description of the hydraulic installations of the lifting equipment A

Electrical installations

15 General arrangement showing location of electrical installations of the lifting equipment I

16 Description of electrical arrangement principles, failure scenarios, redundancy principles, emergency arrangement, etc.

I

17 Power supply and control systems diagrams of the lifting equipment A

(1) A : To be submitted for approval I : To be submitted for information.

(2) For mobile lifting appliance


NR 608, Sec 2


SECTION 2 GENERAL ARRANGEMENT

1 General

1.1 Location of lifting appliances and lay down areas

1.1.1 Lifting appliances should be so located and protectedas to reduce to a minimum any danger to personnel, dueregard being paid to moving parts or other hazards. Ade-quate provisions should be made to facilitate cleaning,inspection and maintenance.

1.1.2 Onboard offshore units, cranes and lay down areasare to be located so as to minimise load lifting over well-head and process areas, when relevant.

1.2 Position of the crane during navigation

1.2.1 When the lifting appliance is a crane, it is to be possi-ble to lower the crane boom and to secure it to the support-ing unit during transit.

NR 608, Sec 3

SECTION 3 STABILITY AND SUBDIVISION

Symbols

LCG : Longitudinal Centre of Gravity

TCG : Transversal Centre of Gravity

VCG : Vertical Centre of Gravity.

1 General

1.1 Application

1.1.1 This Section apply to ships and offshore units whichare engaged in lifting operations at sea and are equipped forthat purpose with one or several lifting equipment.

1.1.2 The requirements of this Section specify the criteriathese vessels are to satisfy in addition to those in Part B, Ch1 of the Offshore Rules for offshore units and Part B, Ch 3 ofthe Ship Rules for ships, as applicable.

1.2 Purpose of the stability check

1.2.1 The purpose of the stability verifications specified inparagraphs [2.3] to [2.6] is to ensure adequate residual sta-bility during lifting operations.

For international voyage or/and transit condition, the crite-ria of Offshore Rules or Ship Rules, as applicable, shallapply.

1.3 Loading conditions

1.3.1 The criteria stated in paragraphs [2.3] to [2.6] shall besatisfied for all loading conditions intended for lifting andwith the crane load at the most unfavorable position.

Several loading conditions corresponding to various boompositions and counter ballast with different filling levelsmay need to be checked.

The loading conditions used to derive the righting armcurve (GZ) shall include:

• the weight and centre of gravity (LCG, TCG, VCG) of thelifted load and its rigging

• the weight and centre of gravity (LCG, TCG, VCG) of theboom

• the weight and centre of gravity (LCG, TCG, VCG) of thecounter ballast if applicable.

1.3.2 In lifting operations involving a lifting appliance suchas a crane, derrick, sheerlegs or any other similar liftingdevice:

• the magnitude of the lifted load shall be the maximumallowed static load at a given outreach of the liftingappliance

• the longitudinal position of the lifted load shall be takenin correspondence to the point at which the load isapplied to the lifting appliance

• the transverse position of the centre of gravity (TCG) ofthe lifted load shall be taken as the distance betweenthe point at which the load is applied to the lifting appli-ance and the vessel's centreline in the upright position

• the vertical position of the centre of gravity of the liftedload (VCG) shall be taken as the vertical distance from thesuspension point to the baseline in the upright position.

1.4 Trim and stability booklet

1.4.1 The following information is to be included in thetrim and stability booklet in addition to the informationrequired in Ship Rules Pt B, Ch 3, App 2:

• Maximum heeling moment for each direction oflift/inclination as a function of the counter-ballast heel-ing moment, if used, the draft, and vertical centre ofgravity.

• Loading conditions at each draft for which lifting opera-tions may be conducted with the maximum verticalload of the lift. Where applicable, righting lever curvesfor both before and after load drop should be presentedfor each loading condition.

• Limitations on operation including permissible loadmoment or heel angles.

• Instructions related to normal operations, including useof counter-ballast.

• Instructions including ballasting/de-ballasting proce-dures to righting the vessel following a sudden loss oflifted load.

• Load chart for lifting operations covering the range ofoperational drafts related to lifting and including a sum-mary of the stability results.

• Where fixed counter ballast is used the following infor-mation shall be included:

- mass of the fixed counter ballast

- centre of gravity (LCG, TCG, VCG) of the fixedcounter ballast.

• A crane specification manual provided by the manufac-turer shall be submitted separately for information.


NR 608, Sec 3

2 Intact stability

2.1 General

2.1.1 Lifting operations involving lifting or lowering ofweights with the use of a lifting device may affect the shipor the unit's stability depending on the:

• type of the lifting equipment installed on board (eg.crane, derrick or sheerlegs)

• the lifted load (type, size and shape), and

• the geographical location (sheltered area, open sea).

2.2 Operational limitations

2.2.1 Lifting equipment are subject to the following opera-tional limitations:

• maximum Safe Working Load (SWL)

• maximum radius of operation of all derricks and liftingappliances

• maximum load moment or heel angle

• wind speed limit affecting the stability of the ship or theunit.

Operational limitations may be set up to exclude liftingoperations when the environmental conditions are toosevere.

Such operational limitations are to be noted in the Classcertificate and in the trim and stability booklet.

2.3 Intact stability criteria during lifting operation

2.3.1 For the loading conditions stated in [1.3], the follow-ing intact stability criteria are to be complied with:

a) The maximum heeling angle of static equilibrium θc is tobe limited to one of the following angles, whicheveroccurs first:

• 10 degrees, or

• angle of deck edge immersion, or

• crane allowable values of list and trim (as obtainedfrom manufacturer).

b) The area under the GZ curve measured from the posi-tion of the heeling angle of static equilibrium θc up tothe angle of downflooding or 20 degrees, whichever isless, shall be at least 0,03 mrad.

2.4 Weather criteria during lifting operation

2.4.1 For the loading conditions stated in [1.3], the follow-ing weather criteria shall be complied with in addition tothe criteria stated in [2.3], calculated for the wind forces inaccordance with [2.4.2] to [2.4.8].

a) For ship shaped units, the area under the rightingmoment curve (A + B) to the second intercept or downflooding angle, whichever is less, is not to be less than

40% in excess of the area under the wind heelingmoment curve (B + C) to the same limiting angle (SeeFig 1):

b) For column stabilized units the area under the rightingmoment curve to the second intercept, or the angle ofdownflooding, whichever is less, is not to be less than30% in excess of the area under the wind heelingmoment curve to the same limiting angle (see Fig 2):

c) The righting moment curve is to be positive over theentire range of angles from θC to the second intercept.

2.4.2 Wind forcesThe curves of wind heeling moments are to be drawn forwind forces calculated by the following formula:

F = 0,5 CS CH P V² A

where:

F : Wind force, in N

CS : Shape coefficient depending on the shape of thestructural member exposed to the wind (refer toTab 1)

CH : Height coefficient depending on the heightabove sea level of the structural memberexposed to wind (refer to Tab 2)

P : Air specific mass (1,222 kg/m3)

V : Wind speed, in m/s

A : Projected area of the exposed surface of thestructural member in either the upright or theheeled condition, in m2.

2.4.3 Wind forces are to be considered from any directionrelative to the floating unit and the value of the wind speedis to be taken as follows:

a) In general, a minimum wind speed of 10 m/s (20 knots)is to be used for normal working conditions

b) Where a floating unit is limited in operation, the maxi-mum wind velocity is to be clearly stated in the craneutilization manual.

A note is to be entered on the Class certificate restrictingthe assigned class to the specified wind conditions.

c) For permanent installations, consideration is to be givento the actual site conditions.

Note 1: For ship shaped units, in general only the longitudinalwindage profile is to be considered.

2.4.4 In calculating the projected areas to the verticalplane, the area of surfaces exposed to wind due to heel ortrim such as under decks surfaces, etc., are to be includedusing the appropriate shape factor. Open truss work may beapproximated by taking 30% of the projected block area ofboth the front and back section, i.e., 60% of the projectedarea of one side. In the case of columns, the projected areasof all columns is to be included.

A B+( )B C+( )

------------------ 1.40≥

A B+( )B C+( )

------------------ 1.30≥


NR 608, Sec 3

Figure 1 : Righting moment and heeling moment curves for ship shaped units

Figure 2 : Righting moment and heeling moment curves for column stabilized units

Table 1 : Shape coefficient Cs

2.4.5 The lever for the wind heeling moment is to be takenvertically from the centre of the lateral resistance or, if avail-able, the centre of hydrodynamic pressure, of the underwa-ter body to the centre of pressure of the areas subject towind loading. When the installation is fitted with dynamicpositioning system, the thrusters effect in [2.4.8] is to beconsidered.

2.4.6 The curve may be assumed to vary as the cosine func-tion of floating unit heel (see Fig 1), while for column stabi-lized units the wind heeling moment curve is to becalculated for a sufficient number of heel angles to definethe curve (see Fig 2).

Table 2 : Height coefficient CH

2.4.7 Wind heeling moments derived from wind tunneltests on a representative model of the floating unit may beconsidered as alternatives to the method given in [2.4.2] to[2.4.6]. Such heeling moment determination is to includelift and drag effects at various applicable heel angles.

2.4.8 Thrusters effect

When deemed necessary, for floating unit on whichdynamic positioning is installed, the thrusters negativeeffect on stability is to be taken into account.

2.5 Intact stability criteria in the event of sudden loss of the lifted load

2.5.1 The accidental loss of the load during lifting due to abreak of the lifting cable is to be considered whenevercounter ballast is used.

In this case, the following intact stability criteria are to becomplied with in addition to those in [2.3] and [2.4].

2.5.2 The ability of a floating unit to withstand the effect ofsudden loss of the lifted load when counter ballast is usedshall be demonstrated, with reference to Fig 3, as follows:

a) Prior to the loss of the lifted load the ship or unit is atheel of static equilibrium θC0. After the sudden loss ofthe lifted load, the ship or unit is assumed to heel to thedirection of the counter ballast to a new angle of heel atstatic equilibrium θC1.

The heel angle at static equilibrium θC1 shall not exceed15 degrees from the upright (see Fig 3):

θC1 ≤ 15°

Shape CS

Spherical 0,40

Cylindrical 0,50

Large flat surface (hull, deckhouse, smooth underdeck areas)

1,00

Drilling derrick 1,25

Wires 1,20

Exposed beams and girders under deck 1,30

Small parts 1,40

Isolated shapes (crane, beam, etc.) 1,50

Clustered deckhouses or similar structures 1,10

Angle of inclination

Downfloodingangle

Secondintercept

Rightingmoment

Heelingmoment

Mom

ent A

BC

C

A

BC

Mom

ent


Downfloodingangle

Secondintercept

Rightingmoment

Heelingmoment

C

Height above sea level, in m CH

0 - 15,3 1,00

15,3 - 30,5 1,10

30,5 - 46,0 1,20

46,0 - 61,0 1,30

61,0 - 76,0 1,37

76,0 - 91,5 1,43

91,5 - 106,5 1,48

106,5 - 122,0 1,52

122,0 - 137,0 1,56

137,0 - 152,5 1,60

152,5 - 167,5 1,63

167,5 - 183,0 1,67

183,0 - 198,0 1,70

198,0 - 213,5 1,72

213,5 - 228,5 1,75

228,5 - 244,0 1,77

244,0 - 259,0 1,79

above 259 1,80


NR 608, Sec 3

Figure 3 : Righting moment curve after sudden loss of the lifted load

b) Under these circumstances, the area B, as indicated inFig 3, under the righting arm curve GZ1 to the secondintercept or downflooding angle is not to be less than40% in excess of the area A under the righting armcurve GZ1 to the heel at static equilibrium θC0 prior tothe loss of the lifted load:

When, after the loss of the lifted load, the floating unit stillheels to the same side, there is no need to comply withabove criteria.GZ0 : Righting lever curve for the loading condition

stated in paragraph 1.5 which includes theweight and centre of gravity (LCG, TCG, VCG)of the lifted load and that of the counter ballast

GZ1 : Righting lever curve for the loading conditionstated in paragraph 1.5 which excludes theweight and centre of gravity (LCG, TCG, VCG)of the lifted load and includes the weight andcentre of gravity of the counter ballast

θC0 : Heeling angle of static equilibrium before lossof the lifted load

θC1 : Heeling angle of static equilibrium after loss ofthe lifted load

θf : Downflooding angle.

2.6 Intact stability criteria for crane overload test

2.6.1 Intact stability check during crane overload testingmay be deemed necessary.

As guidance, floating units which have onboard cranes ofsignificant size compared to the ship general particularsor/and in case the intact stability particulars during normalcrane operations are deemed marginal, the residual intactstability during crane overload test shall be checked andshall never be significantly less than that required by [2.3]to [2.5] as applicable.

A

Bf C1

C0

GZ1

GZ0

Mom

ent


BA---- 1 40,≥


NR 608, Sec 4

SECTION 4 STRUCTURAL ASSESSMENT

1 General

1.1 Application

1.1.1 This Section provides requirements for the structuralassessment of the foundations of the lifting equipment, asdefined in [1.2], the connecting bolts between the liftingequipment and the foundations, and the devices for stow-age during transit.

1.1.2 When the lifting operations are inducing significanthull girder stresses, the hull girder loads due to the liftingoperations are to be considered in the hull scantling verifi-cation, as defined in [3].

1.2 Foundations of the lifting appliance and hull reinforcements

1.2.1 The foundations of the lifting appliance are consid-ered as integral part of hull.

1.2.2 The foundations are the structures permanently con-nected by welding to the hull (for instance crane pedestals,masts, derrick seatings, etc...) to the exclusion of the cranesthemselves, derrick booms, ropes, rigging accessories, slew-ing rings and, generally, any dismountable parts.

1.2.3 The hull is to be strengthened with due considerationto the loads due to lifting operations and lifting appliancestowage during transit.

1.2.4 Applicable rules for the structural assessment of thesupporting unit are addressed in Sec 1.

1.3 Overload consequence

1.3.1 Failure modes in the event of extreme overload are tobe considered as specified in Sec 7, [1.2].

1.3.2 The foundation of the lifting appliance is to withstandthe design overload value referred to in the applicable rulefor classification of the lifting appliance.

2 Hull structural arrangement

2.1 Principles

2.1.1 Framing of ships

In general, ships with the service notation lifting are to belongitudinally framed.

2.1.2 Crane pedestal

In general, crane pedestal is to be continuous through thedeck.

Otherwise, continuous deck plate is to be made of Grade Zsteel quality in way of the crane pedestal.

2.1.3 Structural category and steel grades for lifting appliances and their surrounding structure

For ships, the steel grade of the structural elements of thefoundation is to comply with NR526, Sec 2.

For offshore units, the steel grade of the structural elementsof the foundation is to comply with the Offshore Rules,Part B and taking into account the minimum structural cate-gories given in Tab 1.

Table 1 : Guidance for structural categories for offshore units

2.1.4 Welding

As a rule, full penetration welding is to be providedbetween crane pedestal and deck plate.

3 Hull girder strength

3.1 Principles

3.1.1 In addition to the requirements defined in the rulesapplicable to the floating unit, the hull girder strength is tobe checked with the loads due to lifting operations.

3.2 Hull girder loads

3.2.1 Still water loads

The still water bending moment and shear forces due to lift-ing operations are to be added to the floating unit weightdistribution.

3.2.2 Wave loads

The wave hull girder loads are to be considered with theenvironmental conditions corresponding to the operationallimitations of the lifting equipment, as defined in [4.6.3].

Category Structural elements

Second • crane resting support

First • crane pedestal and its foundation

Special • insert plate of deck plating in way of crane pedestal


NR 608, Sec 4

3.3 Torsional moment

3.3.1 When torsional moments into the hull are induced bylifting operations, the hull girder strength is to be checkedagainst torsion.

4 Lifting equipment foundation

4.1 General

4.1.1 Applicable rules

In addition to compliance with the rules for certificationapplicable to the lifting equipment, the structural assess-ment of the foundation is to comply with the requirementsof the Offshore Rules, Part B, as transcribed in the presentArticle.

4.1.2 Devices for equipment stowage during transit

The locking device used for the stowage of the lifting equip-ment during transit is to comply with the rules applicable tothe supporting unit.

Environmental loads during transit are to be considered.

4.1.3 Design interface loads

All the design loads defined in [4.4] to [4.6] are to be pro-vided by the interested party.

4.2 Mobile lifting appliance

4.2.1 When the lifting appliance is fastened on deck with alashing arrangement, the description of the sea fastening isto be submitted.

4.2.2 A cargo securing manual, as defined in NI 429,Guidelines for the Preparation of the Cargo Securing Man-ual, is to be submitted.

4.3 Loading conditions

4.3.1 The loading conditions and associated design loadsto be considered for the calculation of the foundations aregiven in Tab 3 for guidance purpose.

4.4 Design hoisting loads

4.4.1 Hoisting loads

As a minimum, the following hoisting loads are to be con-sidered:

• the maximum static load equal to the SWL in calm sea,within the geometrical limits of the crane utilisationchart

• the maximum dynamic hoisting loads equal to the max-imum DAF times the SWL associated with the most

severe sea state allowed, within the geometrical limits ofthe crane utilisation chart

• the maximum holding load corresponding to either themaximum brake capacity or the overload release value

• the overload test value of the lifting equipment.

4.4.2 Dynamic amplification factor due to self-motions

Dynamic amplification factors are applied on static loads toaccount for the effect of:

a) lifting equipment self-motions

b) floating unit motions and accelerations.

The dynamic amplification factors are to comply with therules or standard for certification of the lifting equipment.

Additional requirements applicable to subsea lifting are tobe complied with, when relevant.

4.4.3 Boom configuration

The design loads are to be applied at the most unfavorablepositions of the crane boom within the geometrical limits ofthe crane utilisation chart.

4.5 Environmental loads

4.5.1 The environmental loads include:

• wind loads acting on the crane and the lifted cargo, asspecified in [4.5.2]

• the floating unit acceleration and motion correspondingto the allowable sea state for a given operation (DAF) asdefined in [4.4.2]

• the hull girder wave loads corresponding to the allow-able sea state for a given operational limitation, as spec-ified in [4.6.3].

4.5.2 Wind loads

The wind velocity to consider for structural assessment ofthe foundation are given in Tab 2.

Note 1: the design wind velocity corresponds to an average veloc-ity over 1 minute and taken at 10 m above sea level.

The wind loads acting on the lifted cargo are also to be con-sidered.

Table 2 : Wind velocity

4.6 Hull girder loads

4.6.1 Hull girder stresses

The stresses in the longitudinal members of the liftingequipment foundations due to hull girder loads are to beconsidered.

Condition of operation

Wind velocity

Transit 51,5 m/s

Operating 20 m/s or from lifting appliance operat-ing manual, whichever is the greatest


NR 608, Sec 4

Table 3 : Guidance for the design loading conditions

4.6.2 Still water loadsThe still water hull girder loads corresponding to the liftingoperations considered are to be evaluated.

4.6.3 Wave loadsThe wave hull girder loads corresponding to the maximumsea state defined in the operational limitations of the liftingequipment are to be obtained through an hydrodynamicanalysis.

When an hydrodynamic analysis is not performed, the hullgirder stresses are to be evaluated through assumptions tobe defined in agreement with the Society.

4.7 Material strength

4.7.1 The reference stress of material, Rf, is defined by:

where:

ReG : Minimum specified yield stress of the material

R : Tensile strength of the material.

4.7.2 For hull steels, as defined in NR216 Materials andWelding, Rf is equal to the minimum specified yieldstrength of steel.

4.7.3 For light alloy materials (aluminium), when used innon-welded constructions, Rf is to be defined taking intoaccount the material properties in the specified condition ofdelivery. For welded aluminium, Rf is to be taken based onReG in the annealed condition (refer to NR216 Materials andWelding).

5 Allowable stress

5.1 Allowable stress for lifting operations

5.1.1 GeneralFor lifting conditions, the foundations of the lifting equip-ment are to comply with allowable stress criteria defined inOffshore Rules, Pt B, Ch 3, Sec 3 and transcribed below.

5.1.2 Criteria

The equivalent stress σc is not to exceed the allowable stressσa, for the loading condition considered, according to thefollowing formula:

σc ≤ σa

where:

σa : Allowable stress, given by:

σa = 1,1 α Rf

Rf : Material reference stress defined in [4.7]

σc : Equivalent stress defined in Offshore Rules, Pt B,Ch 3, Sec 3, [5]

α : Basic allowable stress factor defined in [5.1.3].

5.1.3 Basic allowable stress factor

The basic allowable stress factor α is to be taken as follows:

a) In general:

• for load case 1 (“static”): α = 0,6

• for load case 2 (“design”): α = 0,8

• for load case 3 (“accidental”): α = 1,0

with the load cases 1, 2 and 3 as defined in OffshoreRules, Pt B, Ch 2, Sec 3

b) For specific calculations:

• for load case 4 (“testing”): α = 0,9

with the load case 4 as defined in Offshore Rules, Pt B,Ch 2, Sec 3.

5.1.4 Hot spot stress criteria

Where the stresses are obtained through a very fine meshFinite Element Model, the above criteria may be replacedby the criteria defined in Offshore Rules, Pt B, Ch 3, Sec 3,[5.4.3].

5.2 Allowable stress for transit conditions

5.2.1 Allowable stress for transit conditions are to be takenas per the rules applicable to the hull of the floating unit.

Loading condition Load caseDesign loads

Environmental loadBasic allowable stress factor (1)hoisting load Hull girder loads

Transit Design none still water + wave Extreme situation (2)

Operating - static Static SWL still water only none α = 0,6

Operating - dynamic Design SWL x DAF still water + wave operating conditions α = 0,8

Accidental situation Accidental Maximum holding load

still water + wave Accidental situation α = 1,0

Testing condition Testing Overload test still water only none α = 0,9

(1) As defined in [5.1]. Factor α is given in this Table as an indication of safety level for each design loading condition.(2) Allowable stress to be taken as per [5.2].

Rf min ReGR

1 2,---------,

=


NR 608, Sec 4

6 Buckling

6.1 Buckling check for lifting operations

6.1.1 The foundations of the lifting equipment are to com-ply with buckling check defined in Offshore Rules, Pt B,Ch 3, Sec 3.

6.2 Buckling check for transit conditions

6.2.1 When deemed necessary, buckling check for transitconditions are to be performed as per the rules applicableto the hull of the floating unit.

7 Fatigue

7.1 Fatigue check for lifting operations

7.1.1 The foundations of the lifting equipment are to com-ply with fatigue check defined in Offshore Rules, Pt B, Ch 3,Sec 3.

7.1.2 Structural details located between the connectionflange with the lifting equipment and the strength deck areto be checked against fatigue failure.

7.1.3 In this case, the justification of the long term distribu-tion of fluctuating stress is to be provided.Note 1: In the absence of data on loading conditions, assumptionsmay be taken from a recognized standard, eg: API Specification 2C.

7.2 Fatigue check for transit conditions

7.2.1 When deemed necessary, fatigue check for transitconditions are to be performed as per the rules applicableto the hull of the floating unit.

7.3 Fatigue check of hull structure

7.3.1 Fatigue check of the hull structure apply for shipsequal to or greater than 170 m in length, as specified inNR467, Pt B, Ch 7, Sec 4.

7.3.2 The relevant operating conditions to apply for fatigueassessment of a ship intended to lifting operations at sea areto be considered on a case by case basis.

8 Connection of the lifting equipment on the foundation

8.1 Connecting bolts

8.1.1 The arrangement and scantling of the connectingbolts between the lifting equipment and its foundations areto comply with a recognized standard.

8.1.2 The manufacture, steel grades and installation ofbolts and nuts used for the connection of the lifting equip-ment on the foundation are to comply with a recognizedstandard.


NR 608, Sec 5


SECTION 5 MACHINERY AND SYSTEMS

1 General

1.1 Application

1.1.1 The requirements of this Section specify criteria to besatisfied in addition to those in Part C, Ch 1 of the OffshoreRules for offshore units and Part C, Ch 1 of the Ship Rulesfor ships, as applicable.

1.2 Essential service

1.2.1 Lifting appliances on vessels granted with the servicenotation lifting, are considered essential services.

2 Position keeping

2.1 General

2.1.1 Vessels granted with the service notation lifting are tobe able to safely maintain their position during lifting opera-tions. This may be achieved with a passive mooring or adynamic positioning system.

2.2 Dynamic positioning

2.2.1 When the unit is fitted with a dynamic positioningsystem, it may be assigned the additional class notationDYNAPOS defined in Part A of the classification rules usedfor the supporting unit.

2.2.2 In this case, lifting units are to be granted with theadditional class notation DYNAPOS AM/AT, completed byone of the following symbols:

• R, when the dynamic positioning is provided withredundancy means. In this case, IMO class 2 equipmentis to be used.

• RS, when, in addition to symbol R, the redundancy isachieved using two systems or alternative means of per-forming a function physically separated. In this case,IMO class 3 equipment is to be used.

2.2.3 The dynamic positioning control stand and the liftingequipment control station are to have 2-way communica-tion means and a manually operated alarm.

NR 608, Sec 6


SECTION 6 ELECTRICAL INSTALLATIONS AND CONTROL

1 General

1.1 Application

1.1.1 The requirements of this Section specify criteria to besatisfied in addition to those in Part C, Ch 2 and Ch 3 of theOffshore Rules for offshore units and Part C, Ch 2 and Ch 3of the Ship Rules for ships, as applicable.

1.2 Essential service

1.2.1 Electrical installations related to the lifting equipmentare to be considered as essential services according to theShip Rules or the Offshore Rules, Pt C, Ch 2, Sec 1.

1.3 Hazardous areas

1.3.1 As far as practicable, electrical installations intendedfor the lifting equipment should not be located in hazardousareas.

1.3.2 Where, due to the operational requirements, someelectrical equipment is located in hazardous areas zone 1or zone 2, it has to comply with the requirements for suchequipment in hazardous areas, as defined in the classifica-tion rules applicable for the vessel:• Pt C, Ch 2, Sec 1 of the Ship Rules, or• Pt C, Ch 4, Sec 3 of the Offshore Rules.

2 Power supply

2.1 General

2.1.1 When the vessel main power plant is used to supplythe lifting equipment, it shall have sufficient power to runsimultaneously:• the lifting equipment at its maximum rated load and

nominal hook velocity

• the essential services

• the dynamic positioning system, when relevant

• the ballast system, when relevant.

3 Lifting equipment controls

3.1 General

3.1.1 The commands on the control stand of the liftingappliance are to comply with NR526 or another recognizedstandard.

3.2 Overload prevention

3.2.1 Each lifting appliance should be fitted, to the satisfac-tion of the Society, with a safety device to give the operatora continuous indication of hook load and rated load foreach radius. The indicator should give a clear and continu-ous warning when approaching the rated capacity of thecrane.

3.3 Emergency system

3.3.1 Emergency lowering system and emergency stops areto comply with the requirements of the NR526 Certificationof lifting appliances onboard ships and offshore units, oranother recognized standard.

3.4 Communication means

3.4.1 The communication system should be arranged fordirect 2-way communication between the lifting equipmentoperating position and:

• the bridge or command centre of the supporting unit

• the dynamic positioning control stand.

NR 608, Sec 7


SECTION 7 SAFETY FEATURES

1 General

1.1 Application

1.1.1 The requirements of this Section specify criteria to besatisfied in addition to those in Part C, Ch 4 of the OffshoreRules for offshore units and Part C, Ch 4 of the Ship Rulesfor ships, as applicable.

1.2 Overload protection system

1.2.1 The description of the overload prevention system onthe lifting equipment is to be provided by the interestedparty.

NR 608, Sec 8

SECTION 8 INSPECTION AND TESTING

1 General

1.1 Application

1.1.1 The present Section provides requirements for inspec-tion and testing of the lifting equipment when first installedonboard or after re-installation.

1.1.2 These tests are to be conducted according to aninspection and testing specification which is to be includedin the lifting equipment technical manual and submitted tothe Society by the interested party.

The Society is to be duly informed of the time and place ofthe commissioning tests of the lifting equipment.

1.1.3 The specification of the commissioning tests of thelifting equipment should be approved by the certifyingauthority of the equipment.

1.1.4 The inspection and testing requirements of the pres-ent Section are provided as a minimum and in addition tothe requirements of the rules or standards referred to in thelifting equipment certificate.

Any additional testing may be required to the satisfaction ofthe attending Surveyor.

1.1.5 The Factory Acceptance Tests (FAT) of the liftingequipment are not in the scope of the present Rule Note.

1.2 In-service survey

1.2.1 The scope of in-service surveys for the maintenanceof classification is described in the Ship Rules Part A forships and in the Offshore Rules Part A for offshore units.

2 Onboard testing

2.1 Lifting installations

2.1.1 Before putting into service, the inspection and testingof the lifting equipment should include, as a minimum:

a) Verification of the presence onboard of the followingdocuments, as defined in Sec 1:• technical manual• planned maintenance system

b) Inspection of the structural arrangement and scantling ofthe foundations of the lifting equipment

c) General examination of the electrical cabling

d) Functional testing of the main and alternative two-waycommunication system at the lifting operating position.

e) Testing of the hydraulic installations

f) Load tests in accordance with the rules and standardsreferred to in the lifting equipment certificate:• Functional tests• Overload tests.

2.1.2 As a rule, all the connections between the supportingunit and the lifting equipment are to be presented for exam-ination by the Surveyor.


NR 608, Sec 8
