LNG bunkering ship. October Rule Note NR 620 DT R00 E

Transcription

1 LNG bunkering ship October 2015 Rule Note NR 620 DT R00 E Marine & Offshore Division Neuilly sur Seine Cedex France Tel: + 33 (0) Fax: + 33 (0) Website: veristarinfo@bureauveritas.com 2015 Bureau Veritas - All rights reserved

2 MARINE & OFFSHORE DIVISION GENERAL CONDITIONS ARTICLE BUREAU VERITAS is a Society the purpose of whose Marine & Offshore Division (the "Society") is the classification (" Classification ") of any ship or vessel or offshore unit or structure of any type or part of it or system therein collectively hereinafter referred to as a "Unit" whether linked to shore, river bed or sea bed 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 ancillary equipment, subsea or not, such as well head and pipelines, mooring legs and mooring points or otherwise as 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 The Society also participates in the application of National and International Regulations or Standards, in particular by delegation from different Governments. Those activities are hereafter collectively referred to as " Certification " The Society can also provide services related to Classification and Certification such as ship and company safety management certification; ship and port security certification, training activities; all activities and duties incidental thereto such as documentation on any supporting means, software, instrumentation, measurements, tests and trials on board The interventions mentioned in 1.1., 1.2. and 1.3. are referred to as " Services ". The party and/or its representative requesting the services is hereinafter referred to as the " Client ". The Services are prepared and carried out on the assumption that the Clients are aware of the International Maritime and/or Offshore Industry (the "Industry") practices The Society is neither and may not be considered as an Underwriter, Broker in ship's sale or chartering, Expert in Unit's valuation, Consulting Engineer, Controller, Naval Architect, Manufacturer, Shipbuilder, Repair yard, Charterer or Shipowner who are not relieved of any of their expressed or implied obligations by the interventions of the Society. ARTICLE Classification is the appraisement given by the Society for its Client, at a certain date, following surveys by its Surveyors along the lines specified in Articles 3 and 4 hereafter on the level of compliance of a Unit to its Rules or part of them. This appraisement is represented by a class entered on the Certificates and periodically transcribed in the Society's Register Certification is carried out by the Society along the same lines as set out in Articles 3 and 4 hereafter and with reference to the applicable National and International Regulations or Standards It is incumbent upon the Client to maintain the condition of the Unit after surveys, to present the Unit for surveys and to inform the Society without delay of circumstances which may affect the given appraisement or cause to modify its scope The Client is to give to the Society all access and information necessary for the safe and efficient performance of the requested Services. The Client is the sole responsible for the conditions of presentation of the Unit for tests, trials and surveys and the conditions under which tests and trials are carried out. ARTICLE The Rules, procedures and instructions of the Society take into account at the date of their preparation the state of currently available and proven technical knowledge of the Industry. They are a collection of minimum requirements but not a standard or a code of construction neither a guide for maintenance, a safety handbook or a guide of professional practices, all of which are assumed 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 documents The Society only is qualified to apply its Rules and to interpret them. Any reference to them has no effect unless it involves the Society's intervention The Services of the Society are carried out by professional Surveyors according to the applicable Rules and to the Code of Ethics of the Society. Surveyors have authority to decide locally on matters related to classification and certification of the Units, unless the Rules provide otherwise The operations of the Society in providing its Services are exclusively conducted by way of random inspections and do not in any circumstances involve monitoring or exhaustive verification. ARTICLE The Society, acting by reference to its Rules: "reviews the construction arrangements of the Units as shown on the documents presented by the Client; "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 the extent of the surveys to be changed. ARTICLE The Society acts as a provider of services. This cannot be construed as an obligation bearing on the Society to obtain a result or as a warranty The certificates issued by the Society pursuant to 5.1. here above are a statement on the level of 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, production or repair checks, neither in the operation of the Units or in their trade, neither in any advisory services, and cannot be held liable on those accounts. Its certificates cannot be construed as an implied or express warranty of safety, fitness for the purpose, seaworthiness of the Unit or of its value for sale, insurance or chartering The Society does not declare the acceptance or commissioning of a Unit, nor of its construction in conformity with its design, that being the exclusive responsibility of its owner or builder The Services of the Society cannot create any obligation bearing on the Society or constitute any warranty of proper operation, beyond any representation set forth in the Rules, of any Unit, equipment or machinery, computer software of any sort or other comparable concepts that has been subject to any survey by the Society. ARTICLE The Society accepts no responsibility for the use of information related to its Services which was not provided for the purpose by the Society or with its assistance If the Services of the Society or their omission cause to the Client a damage which is proved to 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 having caused the damage, 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 one and a half times the above mentioned fee. These limits apply regardless of fault including 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 as a consequence of the Services or their omission such as loss of revenue, loss of profit, loss of production, loss relative to other contracts and indemnities for termination of other agreements All claims are to be presented to the Society in writing within three months of the date when the Services 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 interrupted thereafter with the same periodicity. ARTICLE Requests for Services are to be in writing Either the Client or the Society can terminate as of right the requested Services after giving the other party thirty days' written notice, for convenience, and without prejudice to the provisions in Article 8 hereunder The class granted to the concerned Units and the previously issued certificates remain valid until the date of effect of the notice issued according to 7.2. here above subject to compliance with 2.3. here above and Article 8 hereunder The contract for classification and/or certification of a Unit cannot be transferred neither assigned. ARTICLE The Services of the Society, whether completed or not, involve, for the part carried out, the payment of fee upon receipt of the invoice and the reimbursement of the expenses incurred Overdue amounts are increased as of right by interest in accordance with the applicable legislation The class of a Unit may be suspended in the event of non-payment of fee after a first unfruitful notification to pay. ARTICLE The documents and data provided to or prepared by the Society for its Services, and the information available 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 classification 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 governmental or inter-governmental authorities or of a Court having jurisdiction. The documents and data are subject to a file management plan. ARTICLE Any delay or shortcoming in the performance of its Services by the Society arising from an event not reasonably foreseeable by or beyond the control of the Society shall be deemed not to be a breach of contract. ARTICLE In case of diverging opinions during surveys between the Client and the Society's surveyor, the Society may designate another of its surveyors at the request of the Client Disagreements of a technical nature between the Client and the Society can be submitted by the Society to the advice of its Marine Advisory Committee. ARTICLE Disputes over the Services carried out by delegation of Governments are assessed within the framework of the applicable agreements with the States, international Conventions and national rules Disputes arising out of the payment of the Society's invoices by the Client are submitted to the Court of Nanterre, France, or to another Court as deemed fit by the Society Other disputes over the present General Conditions or over the Services of the Society are exclusively submitted to arbitration, by three arbitrators, in London according to the Arbitration Act 1996 or any statutory modification or re-enactment thereof. The contract between the Society and the Client shall be governed by English law. ARTICLE These General Conditions constitute the sole contractual obligations binding together the Society and the Client, to the exclusion of all other representation, statements, terms, conditions whether express or implied. They may be varied in writing by mutual agreement. They are not varied by any purchase order or other document of the Client serving similar purpose The invalidity of one or more stipulations of the present General Conditions does not affect the validity of the remaining provisions The definitions herein take precedence over any definitions serving the same purpose which may appear in other documents issued by the Society. BV Mod. Ad. ME 545 L - 7 January 2013

3 RULE NOTE NR 620 NR 620 LNG bunkering ship SECTION 1 SECTION 2 SECTION 3 SECTION 4 SECTION 5 SECTION 6 SECTION 7 SECTION 8 SECTION 9 APPENDIX 1 GENERAL SHIP ARRANGEMENT HULL AND STABILITY TRANSFER SYSTEMS INERT GAS SYSTEMS ELECTRICAL INSTALLATIONS AND INSTRUMENTATION AUTOMATION SYSTEMS FIRE SAFETY ADDITIONAL SERVICE FEATURES RISK ANALYSIS October 2015

4 Section 1 General 1 General Application 1.2 Scope 1.3 Exclusion 1.4 Classification notations 2 References Acronyms 2.2 Definitions 2.3 Referenced documents 3 Document to be submitted General 4 Tests and trials LNG transfer system trials in working condition Section 2 Ship Arrangement 1 General design requirements Risk analysis 1.2 Hazardous area 2 Material requirements General 3 Arrangement of bunkering system LNG bunkering station 3.2 Bunkering control station 4 Ventilation in closed or semi- enclosed spaces General Section 3 Hull and Stability 1 Location of cargo tanks General Section 4 Transfer Systems 1 General Application 1.2 Requirements 2 Hoses General 2.2 Design requirements 2.3 Type approval of bunkering hose 2 Bureau Veritas October 2015

5 2.4 Type approval testing 2.5 Workshop Testing 2.6 Survey requirements 2.7 Hoses onboard 3 Quick connect disconnect coupler (QCDC) Type approval of QCDC 3.2 Type testing 3.3 Workshop testing 4 Break-away and emergency release coupling (ERC) General 4.2 Type approval of break-away and ERC 4.3 Type testing 4.4 Workshop testing 5 Electrical isolation flanges General 6 Supports General 6.2 Transfer arm 7 Swivels General 8 Auxiliary equipment General 9 LNG transfer system General 9.2 Testing of the complete system 10 Bunkering transfer rate General 10.2 Sampling 11 Arrangement for draining the LNG transfer lines General 12 Compatibility between receiving ship and bunkering ship General Section 5 Inert Gas Systems 1 General Application 1.2 Requirements Section 6 Electrical Installations and Instrumentation 1 General Application 1.2 System of supply October 2015 Bureau Veritas 3

6 2 Earth detection Monitoring of circuits in hazardous areas 3 Gas detection Gas detection in enclosed spaces 3.2 Gas detection in open areas 4 Emergency shut-down systems (ESD) Section 7 Automation Systems 1 General Application 1.2 Emergency shut-down systems (ESD) 1.3 Alarms and safety actions 1.4 Communication systems Section 8 Fire Safety 1 General Application 1.2 Water Spray systems 1.3 Dry chemical powder 2 Fire protection Fire extinction Water spray systems 3.2 Dry chemical powder fire-extinguishing system Section 9 Additional Service Features 1 Additional service feature RE General 2 Additional service feature IG-Supply General 3 Additional service feature Initial-CD General 4 Additional service feature BOG General 4.2 Vapour return line 4 Bureau Veritas October 2015

7 Appendix 1 Risk Analysis 1 General Purpose of this appendix 1.2 Form of the risk analysis 1.3 Single failure concept 1.4 Scope of the risk analysis 2 Systems to be analysed General 2.2 LNG transfer system 2.3 Gas detection system 2.4 Control monitoring and safety systems 3 Unexpected events to be analysed LNG leakage 3.2 Risk related to the receiving ship 3.3 Black-out October 2015 Bureau Veritas 5

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9 NR 620, Sec 1 SECTION 1 GENERAL 1 General 1.1 Application The present Rule Note applies to ships carrying liquefied natural gas (LNG) and intended to ensure the transfer of LNG to ships using LNG as fuel. Ships complying with this Rule Note may be assigned classification notations defined in [1.4] In general, this Rule Note applies to bunkering and gas transfer systems of the ship, which is additionally to comply with the applicable requirements indicated in Tab 1. Table 1 : Additional applicable requirements Item Reference Ship arrangement NR467, Part B Hull NR467, Part B Stability NR467, Part B Machinery and cargo system NR467, Part C Electrical installations NR467, Part C Automation NR467, Part C Fire protection, detection and NR467, Part C extinction Carriage of liquefied gases NR467, Part D, Chapter 9 Note 1: NR467: Rules for the Classification of Steel Ships (hereafter referred as Ship Rules) Ships complying with the requirements of this Rule Note are to comply with IGC Code except otherwise specified. This Rule Note provides additional requirements and interpretations of IGC Code, which are also mandatory class requirements. The society may refer to IGC Code when deemed necessary. 1.2 Scope This Rule Note covers: the design and installation of the LNG transfer systems from bunkering ship to the receiving ship and the vapour transfer system from the receiving ship to bunkering ship, including LNG hoses, transfer arms and auxiliary equipment for handling the LNG system the design and installation of the equipment intended for the boil-off gas management of the bunkering ship the design and installation of the gas piping system of the bunkering ship the safety arrangements. 1.3 Exclusion This Rule Note does not cover the LNG storage tanks, associated piping and process systems which are to comply with the requirements of IGC Code and Ship Rules, Part D, Chapter Classification notations Service notation Ships complying with the requirements of this Rule Note are to be granted the service notation LNG bunkering ship Additional service features The service notation LNG bunkering ship may be completed by the following additional service features, as applicable: RE, where the ship is designed to receive LNG from a gas fuelled ship for which the LNG fuel tanks have to be emptied. Initial-CD, where the ship is designed for initial cooling down of the gas fuelled ship LNG fuel tank. IG-Supply, where the ship is designed to supply inert gas and dry air, to ensure gas freeing and aeration, to a gas fuelled ship complying with IGF Code, paragraph BOG, where the ship is designed to recover and manage the boil-off gas generated during the bunkering operation. 2 References 2.1 Acronyms The following acronyms are used: BOG : Boil-Off Gas ERC : Emergency Release Coupling ESD : Emergency Shut-Down systems LNG : Liquefied Natural Gas MAAT : Maximum Allowable Applied Twist MBR : Minimum Bend Radius QCDC : Quick Connect/Disconnect Couplers. 2.2 Definitions Auxiliary equipment Auxiliary equipment for handling the LNG transfer system refer to the following equipment: Hydraulic systems Power supply Inert gas systems Supporting equipment Water curtains etc... October 2015 Bureau Veritas 7

10 NR 620, Sec LNG bunkering station LNG bunkering station means the following equipment: hoses and piping connections used for liquid and vapour return lines, including the isolating valves and the emergency shut-down valves Automation and alarms systems the drip tray with its draining arrangement and other arrangements intended for the ship structure protection the gas and leak detection systems the associated firefighting installations the monitoring systems (i.e. thermic camera) Bunkering emergency shut-down system (ESD) An ESD is a system that safely and effectively stops the transfer of LNG (and vapour as applicable) between the receiving ship and the bunkering ship in the event of an emergency during the bunkering operation, and puts the system in a safe condition. Note 1: In addition to the ESD required by IGC Code, if a separate transfer system is provided Bunkering connections Bunkering connections correspond to the end of the fixed piping to the bunkering ship (i.e. manifold for a system with flexible hose and before the swivel for a system with transfer arm) Emergency release coupling (ERC) An ERC is a coupling located on the receiving ship bunkering manifold or on the LNG transfer system, which separates at a predetermined section, when required, each separated section containing a self-closing shut-off valve, which seals automatically. An emergency release coupling can be activated: by maximal allowable forces applied to the predetermined section by manual or automatic control, in case of emergency Enclosed space Enclosed space means any space within which, in the absence of artificial ventilation, the ventilation will be limited and any explosive atmosphere will not be dispersed naturally Hazardous area According to IGC Code, hazardous area means an area in which an explosive gas atmosphere is or may be expected to be present, in quantities such as to require special precautions for the construction, installation and use of electrical apparatus. Hazardous areas are divided into Zone 0, 1 and 2 as defined below and according to the area classification specified in Sec 2, [1.2]: Zone 0: Area in which an explosive gas atmosphere is present continuously or is present for long periods Zone 1: Area in which an explosive gas atmosphere is likely to occur in normal operation Zone 2: Area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it does occur, is likely to do so only infrequently and will exist for a short period only LNG transfer system A LNG transfer system is a system used to connect the bunkering ship and the receiving ship in order to transfer LNG only or both LNG and LNG vapour. The LNG transfer system includes: rigid pipes, hoses, swivels, valves, couplings supporting structure handling system and its control/monitoring system. It also includes the compressors or blowers intended for the boil-off gas pressure management, when required LNG vapour return lines A LNG vapour return line is a connection between the bunkering ship and the receiving ship to prevent pressure increase in the receiving tank due to liquid transfer and associated boil-off Non-hazardous area Non-hazardous area means an area in which an explosive gas atmosphere is not expected to be present in quantities such as to require special precautions for the constructions, installation and use of electrical apparatus Open deck Open deck means a deck that is open on both ends, or is open on one end equipped with adequate natural ventilation that is effective over the entire length of the deck through permanent openings distributed in the side panels or in the deck above Quick connect disconnect coupler (QCDC) A QCDC is a manual or hydraulic mechanical device used to connect the LNG transfer system to the receiving ship manifold Receiving ship A receiving ship is a ship receiving LNG as fuel Safety zone The safety zone is a zone around the bunkering ship, the bunkering station of the receiving ship and the LNG transfer system, where the only activities performed are the bunkering operations and related activities and where measures are taken to prevent leakage of LNG or LNG vapour and to control sources of ignition Semi-enclosed space Semi-enclosed space means a space limited by decks and or bulkheads in such manner that the natural conditions of ventilation are notably different from those obtained on open deck Transfer arm Transfer arm refers to any system allowing supporting a hoses or rigid pipes during bunkering operations. 8 Bureau Veritas October 2015

11 NR 620, Sec Referenced documents Ship Rules Ship Rules means Rules for the Classification of Steel Ships (NR467) NR320 NR320 means the latest version of NR320 Certification Scheme of Materials and Equipment for the Classification of Marine Units NR216 NR216 means the latest version of NR216 Rules on Materials and Welding for the Classification of Marine Units IGC Code IGC Code means the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk, published by the International Maritime Organization IGF Code IGF Code means the International Code of Safety for Ship using Gases or other Low-flashpoint Fuels, published by the International Maritime Organization. The society may refer to IGF Code when deemed necessary SOLAS Convention SOLAS Convention means the International Convention for the Safety of Life at Sea, 1974, as subsequently amended IEC IEC means the International Electrotechnical Commission standard: Electrical installations in ships (Part 502: Tankers - Special features). 3 Document to be submitted 3.1 General The drawing and related information to be submitted are listed in Tab 2, and, as relevant, in Sec The operating manuals and procedures to be submitted are listed in Tab 3. 4 Tests and trials 4.1 LNG transfer system trials in working condition LNG transfer system, defined in [2.2.8], is to be examined by Surveyor during the first LNG bunkering operation. The following examinations are to be conducted during the first LNG transfer: a) Examination of transfer piping systems including supporting arrangements. b) Witness satisfactory operation of the following: Control and monitoring systems Connections systems (QCDC). Table 2 : Documentation to be submitted No A/I Documents 1 A General arrangement of the ship showing the location of the bunkering station and bunkering control station 2 I Risk analysis - LNG transfer system (see App 1) and the follow up report 3 A Details of maximum bunkering flow and maximum pressure (see Sec 4) 4 A Details of LNG transfer system (see Sec 4) 5 A Details of ESD Bunkering system (see Sec 4) 6 I Safety certificates for electrical equipment, concerning the bunkering, located in hazardous areas, where applicable 7 A Instrumentation list 8 A Drawing of transfer arm Note 1: A : To be submitted for approval I : To be submitted for information Table 3 : Operating manuals and procedures to be submitted No A/I Documents 1 I Bunkering procedure, including inerting and gas freeing 2 I BOG management procedure 3 I Operating envelop of the bunkering ship 4 I Risk analysis of the bunkering operations Note 1: A : To be submitted for approval I : To be submitted for information October 2015 Bureau Veritas 9

12 NR 620, Sec 2 SECTION 2 SHIP ARRANGEMENT 1 General design requirements 1.1 Risk analysis LNG transfer system The design and the installation of the LNG transfer system are to be substantiated by a risk analysis to be performed in accordance with App Hazardous area General The hazardous areas are to be in accordance with IGC Code, regulation Zone 1 This zone includes in addition to IGC Code: LNG bunkering station areas on the open deck within spillage coamings surrounding gas bunkering manifold valves and 3 m beyond these, up to a height of 2,4 m above the deck when applicable, transfer arm operating amplitude Classification of spaces adjacent to hazardous areas A space separated by gastight boundaries (with or without opening) from an hazardous area may be classified as zone 1, 2 or considered as hazardous, taking into account the sources of release inside that space, the type and arrangements of openings and the conditions of ventilation, as per IEC Publication , paragraph 4.1. A type approved gastight bulkhead penetration device is not considered as a source of release. 2 Material requirements 2.1 General Materials used in LNG transfer systems, piping system for liquefied gas and other systems or components in contact with gas are to be in accordance with IGC Code, Chapter 6 and Ship Rules, Pt D, Chapter 9. Materials are in general to be in accordance with NR Arrangement of bunkering system 3.1 LNG bunkering station General The LNG bunkering station is to be located in a area with sufficient natural ventilation. Closed or semi-enclosed bunkering stations will be subject to special consideration. The LNG bunkering station is to be physically separated or structurally shielded from accommodation and control stations. Structural strength calculations and drawings manifolds are to be submitted to the Society and stated on the manifolds Hazardous area created during bunkering operations A particular attention is to be paid to the hazardous areas created during the bunkering operations and to restrict the access in order to avoid the presence of unauthorized persons in the vicinity of these hazardous areas and the possibility to create source of ignition Drip trays Drip trays are to be fitted below the liquid bunkering connections and where leakage may occur which can cause damage to the ship structure. Thermal sensors are to be positioned in way of bunkering connections in the drip tray. The drip trays are to be made of stainless steel, and capable of being remotely drained over the ship s side without risk of damage to the ship structure and to the receiving ship. A water piping system is to be fitted in way of the hull under the bunkering manifold to provide low-pressure water curtain for additional protection of the hull steel and the ship s structure. This system is to be in operation when transfer system is in progress. Other solutions are acceptable with justification Bow and stern arrangements LNG bunkering station may be accepted at the ship bow and stern provided that the relevant requirements of IGC Code, paragraph 3.8, are satisfied. 3.2 Bunkering control station The bunkering control station is to be considered as a control station with regard to requirements of Steel Ships, Part C and Part D and of the IGC Code Control of the bunkering operation should be possible from a safe location with regards to bunkering operations and may be from the cargo control room. At this location, overfilling alarm, automatic and manual shutdown are be indicated. 10 Bureau Veritas October 2015

13 NR 620, Sec 2 4 Ventilation in closed or semienclosed spaces 4.1 General Ventilation of closed or semi-enclosed space is to be of mechanical type and take place in the lower part of the compartment. Furthermore a gas detection system is to be fitted Any ducts used for the ventilation of hazardous areas are to be separated from that used for the ventilation of nonhazardous areas. The ventilation is to be capable of functioning at all temperature conditions the ship is designed to operate in. Electric fan motors are not to be located in ventilation ducts for hazardous areas unless the motor is certified for the same area classification and operating conditions as the space served Ventilation ducts shall have the same area classification as the ventilated space Ventilation capacity is to be in accordance with paragraph of IGC Code. October 2015 Bureau Veritas 11

14 NR 620, Sec 3 SECTION 3 HULL AND STABILITY 1 Location of cargo tanks 1.1 General The location of cargo tanks are to be in accordance with requirements of IMO resolution MSC.370(93), Chapter 2, paragraph Bureau Veritas October 2015

15 NR 620, Sec 4 SECTION 4 TRANSFER SYSTEMS 1 General 1.1 Application This Section covers the LNG transfer systems, LNG vapour return transfer systems and their mandatory associated systems including: Hoses QCDC Break-away Isolation flanges. This Section also covers the following systems: ERC Support Swivels Auxiliary equipment. 1.2 Requirements The LNG transfer system is to include a Quick Connect Disconnect Coupler (QCDC), a Break-away coupling or a ERC and insulation flanges Transfer systems and their associated systems are to be considered as essential services as defined in Ship Rules, Part A, Ch 1, Sec 1, [1.2.1] The transfer system is to be designed to avoid the release of gas or liquid to the atmosphere during bunkering operations. 2 Hoses 2.1 General The requirements of IGC Code, in particular paragraph 5.7, are to be fulfilled. 2.2 Design requirements General The following characteristics are to be defined by the designer and submitted to the Society: Extreme service temperature Maximum working load Maximum design pressure Minimum bend radius (MBR) Maximum allowable applied twist (MAAT) Maximum design pressure The maximum design pressure is not to be less than 10 bar in accordance with paragraph of IGC Code Materials All materials are to be compatible with each other and with the fluid conveyed (LNG and LNG vapours) End connection and coupling The end fittings are to be made of stainless steel and be in accordance with IGC Code or NR Type approval of bunkering hose Bunkering hoses are to be type approved by the Society All hoses are to be tested at the plant of manufacturer in the presence of the Surveyor. An alternative survey scheme, BV Mode I as per Rule Note NR320 as amended, may be agreed with the Society. 2.4 Type approval testing Validation test After type approval testing, as defined in [2.4.2] to [2.4.9], the hose assembly is to be subjected to a hydraulic pressure test to a pressure not less than 1,5 times the nominal pressure, to demonstrate that the hose assembly is capable of withstanding these tests without leaking Temperature and pressure cycle test The hose assembly is to be subjected to a pressure cycle test at ambient temperature to demonstrate that the hose is capable of withstanding pressure cycle test from zero to at least twice the specified maximum working pressure. The hose assembly is also to be subjected to a cryogenic temperature and pressure cycle test with a minimum of 200 combined test cycles Burst pressure test After the pressure cycle test, as defined in [2.4.2], has been carried out, the prototype test is to demonstrate a bursting pressure of at least 5 times its specified maximum working pressure at the upper and lower extreme service temperature Bending cycle fatigue test The hose assembly is to be subjected to a bending cycle fatigue test, at ambient and cryogenic temperature, with cycles without failure. The fatigue bend radius is to be in accordance with designer recommendation. October 2015 Bureau Veritas 13

16 NR 620, Sec Crushing test The hose assembly is to be subjected to a crushing test at ambient temperature and cryogenic temperature without damage. The hose assembly is to be held between two rigid plates (an area equivalent to the diameter of the hose) and a force of 1000N is to be applied ten times at the same location in the middle of each flexible hose Impact test The hose assembly is to be subjected to an impact test to ensure that the hose is capable of withstanding loads without damage at ambient and cryogenic temperature Tensile test The hose assembly is to be subjected to a tensile test at ambient and cryogenic temperature to ensure that the hose is capable of withstanding the maximum working load Bending test to minimum bend radius (MBR) The hose assembly is to be subjected to a bending test at ambient and cryogenic temperature to ensure that the hose is capable of withstanding the maximum working pressure at minimum working bend radius. Hose should be gradually bent to the MBR and then pressurized to the maximum working pressure. Hose shall be examined for leaks whilst being held for 15 min at MBR and no damage should be evident on return pre-test conditions Maximum allowable applied twist (MAAT) test The hose assembly is to be subjected to a ambient and cryogenic twist test to ensure that the hose is capable of withstanding its maximum working load whilst at MAAT. The hose assembly is to be gradually twisted to the MAAT and then pressurized to the maximum working pressure. The hose is to be examined for leaks whilst being held for 15 min at MAAT and no damage should be evident on return pre-test conditions Electrical testing The hose assembly is to be subjected to a electrical test. The hose assembly is to be drained and supported above ground by non-conductive means and the resistance measured between the two end fittings (connection face). Electrically continuous hoses shall have a resistance of less than 10 Ω. Electrically discontinuous hoses shall have a resistance of not less than Ω. 2.5 Workshop Testing Application Each produced length of cargo hose completed with end-fittings is to be tested as defined in [2.5.2] to [2.5.4] (hoses used for prototype testing are not to be used onboard) Pressure test The hose assembly shall be subjected to a hydraulic pressure test at ambient temperature and a pressure test at cryogenic temperature, to a pressure not less than 1,5 times the nominal pressure, but not more than two fifths of its bursting pressure, to demonstrate that the hose assembly is capable of withstanding its pressure without leaking Leak test The hose assembly shall be subjected to a pneumatic pressure test, at ambient temperature, to a pressure not less than 1,1 times the design pressure, to demonstrate that the hose assembly is capable of withstanding its pressure without leaking Inspection of welds Welds of the hose assembly are to be subjected to non destructive testing (NDT). When applicable, all butt welds of the hose assembly with connections systems are to be subjected to a 100% radiography examination. 2.6 Survey requirements Survey The products are to be manufactured, examined and tested by the manufacturer. Arrangements shall be made for a Society's Surveyor to attend the relevant tests and examinations at manufacturer's works or to perform the relevant audits when an alternative survey scheme (BV Mode I) has been agreed Certification When the design assessment and testing are successfully completed and the documentation (study and test reports) are examined, a type approval certificate is issued and given a validity period of 5 years. 2.7 Hoses onboard General Transfer hose manufacturer s instructions regarding testing, storage and number of temperature and pressure operating cycles before removal from service are to be strictly followed. The maximum service life of the hose assembly should not exceed 5 years and hoses are to be inspected periodically during the annual survey of the LNG bunkering ship Documents A document containing the following information is to be kept on board: Hose identification number Type approval certificate Date of initial entry into service Initial test and certificates Records of all transfer operations. This document is to be made available during any survey by the Port Administration. 14 Bureau Veritas October 2015

17 NR 620, Sec Marking of products Each hose is to be permanently marked with at least the following information: Manufacturer's name or logo Hose designation and size Maximum working pressure Maximum and minimum working temperature Overall weight of the hose and end fittings assembly Date of manufacture Society's brand as relevant Date of last inspection and testing. 3 Quick connect disconnect coupler (QCDC) 3.1 Type approval of QCDC QCDC are to be type approved by the Society All QCDC are to be tested at the plant of manufacturer in the presence of the Surveyor. An alternative survey scheme, BV Mode I as per Rule Note NR320, may be agreed with the Society. Each produced QCDC is to be tested as defined in [3.3.1] (QCDC used for prototype testing are not to be used onboard). 3.2 Type testing The QCDC is to be subjected to a type test to confirm the release performance under ice built up condition. 3.3 Workshop testing Pressure test The QCDC is to be subjected to a hydraulic pressure test, at ambient temperature, to a pressure not less than 1,5 times the design pressure, to demonstrate that the QCDC is capable of withstanding its pressure without leaking. 4 Break-away and emergency release coupling (ERC) 4.1 General The bunkering line is to be designed and arranged to withstand the surge pressure that may result from the activation of the break-away or the ERC Justifications are to be submitted regarding the compatibility with hoses and the maximum axial and shear forces likely to be exerted on the break-away or the ERC during the bunkering operations. Alternatively the manifold area may be suitably reinforced. Details of the manifold loads are to be submitted to the society for information ERC is to be designed for: Remote and local manual activation Automatic activation in case of excessive forces Automatic activation in case the safe working envelope of the loading arm is exceeded In the event of activation of the break-away or the ERC, the hoses are to be adequately supported and protected to prevent potential damage, spark or rupture due to mechanical shocks All electrical components of the emergency release coupling actuator are to be of a suitable safe type. When applicable, the availability of hydraulic power is to be monitored. If the power supply of ERC by the hydraulic source is no longer available, bunkering operation is to be stopped. 4.2 Type approval of break-away and ERC Break-away and ERC are to be type approved by the Society All break-away and ERC are to be tested at the plant of manufacturer in the presence of the Surveyor. An alternative survey scheme, BV Mode I as per Rule Note NR320, may be agreed with the Society. Each produced break-away and ERC are to be tested as defined in [4.3.1] (break-away and ERC used for prototype testing are not to be used onboard). 4.3 Type testing The break-away or the ERC are to be subjected to a type test to confirm the values of axial and shear forces at which it automatically separates. The tightness of the selfclosing shut-off valves after separation is to be checked The break-away or the ERC are to be subjected to a type test to confirm the release performance under ice built up condition When applicable, the ERC is to be subjected to a type test to confirm the automatic release in case of activation. 4.4 Workshop testing Pressure test The break-away or the ERC are to be subjected to a hydraulic pressure test, at ambient temperature, to a pressure not less than 1,5 times the design pressure, to demonstrate that the break-away or the ERC are capable of withstanding its pressure without leaking. 5 Electrical isolation flanges 5.1 General Each insulation flange is to be subjected to a test of electrical resistance in air and the resistance is to be not less than Ω. October 2015 Bureau Veritas 15

18 NR 620, Sec The resistance of each insulation flange is to be measured after installation in the complete LNG transfer system and the resistance is to be not less than 1000Ω. 6 Supports 6.1 General Hoses are to be suitably supported in such a way that the allowable bending radius is satisfied. They should normally not lay directly on the ground. They are to be arranged with enough slack to allow for all possible movements between the receiving ship and the bunkering ship. 6.2 Transfer arm When applicable, the maximum allowable operating amplitude for the system is to be defined and hose handling arm shall be approved by the Society. 7 Swivels 7.1 General Pressure swivels The pressure parts of a pressure swivel are to be designed and manufactured according to the requirements of Pt C, Ch 1, Sec 3 of the Ship Rules or other recognised pressure vessel code. A pressure swivel is to be isolated from the structural loads due to the connection with the receiving ship. Means are to be provided to collect and safely dispose of liquid leaks Static resistance test Pressure swivels are to be subjected to a pressure resistance static test, according to its design code Dynamic test Rotation and oscillation test including rest periods are to be performed at design pressure with measurement of starting and running moments. At least two complete rotations, or equivalent, in each direction are to be performed. 8 Auxiliary equipment 9 LNG transfer system 9.1 General The requirements [9.2.1] and [9.2.2] apply to complete LNG transfer systems including additional safety devices such as dry break-away coupling/self-sealing quick release, ERC, swivels, etc. (i.e: all parts which are after the bunkering manifold). 9.2 Testing of the complete system Pressure test The LNG transfer system is to be subjected to a hydraulic pressure test, at ambient temperature, to a pressure not less than 1,5 times the nominal pressure, to demonstrate that the hose assembly is capable of withstanding its pressure without leaking Inspection of welds When applicable, the welds of the LNG transfer system with connections systems are to be subjected to a nondestructive examination (NDE) test and all butt welds of the LNG transfer system with connections systems are to be subjected to a 100% radiography examination. 10 Bunkering transfer rate 10.1 General The bunkering transfer rate is to be kept within the capabilities of the receiving ship The maximum LNG transfer rate is to be justified, taking into consideration: The management of the BOG generated during bunkering operation The temperature of the LNG supplied to the ship Characteristics of the receiving tank The maximum flow permitted by the ERC The maximum flow permitted by the hose The maximum flow permitted by the QCDC The LNG velocity in the piping system is not to exceed 10m/s in order to avoid the generation of static electricity and to limit the heat transfer due to friction inside the pipes. 8.1 General The auxiliary equipment, as defined in Sec 1, [2.2.1] are to be in accordance with Ship Rules Sampling Connections for taking LNG samples are to be in accordance with IGC Code and Ship Rules. 16 Bureau Veritas October 2015

19 NR 620, Sec 4 11 Arrangement for draining the LNG transfer lines 11.1 General In order to prevent cryogenic liquid spills, the design of the transfer system is to be such that the lines can be drained before disconnection and purged after an emergency disconnection. 12 Compatibility between receiving ship and bunkering ship 12.1 General The ship working limits of bunkering are to be checked with regards to at least the following aspects: Draught and freeboard difference between the receiving ship and the LNG bunkering ship Compatibility of the bunkering arm or hose operating amplitude with the bunkering station location Pressure and temperature difference between the LNG tanks of receiving ship and bunkering ship Vapour management Vapour return line (pressure and temperature) Delivery flow rate (maximum and minimum) Type and size of hose connections systems. Compatibility of the ESD link Mooring arrangement. October 2015 Bureau Veritas 17

20 NR 620, Sec 5 SECTION 5 INERT GAS SYSTEMS 1 General 1.2 Requirements 1.1 Application This Section covers the inert gas systems for purging the bunkering lines The inert gas systems are to be in accordance with the requirements 9.5 of the IGC Code The inerting capacity is to be designed according the bunkering operations and it is not to be less than 5 times the volume of the hose and pipes to be purged. 18 Bureau Veritas October 2015

21 NR 620, Sec 6 SECTION 6 ELECTRICAL INSTALLATIONS AND INSTRUMENTATION 1 General 1.1 Application The requirements of IGC Code, as amended, relating to electrical installations are to be complied with. The present Section includes additional requirements and interpretations of IGC Code, which are to be considered mandatory for class In case of conflict between this Section and IGC Code, the Society is to be consulted for clarification. 1.2 System of supply Acceptable systems of supply The following systems of generation and distribution of electrical energy are acceptable: a) direct current: two-wire insulated b) alternating current: single-phase, two-wire insulated three-phase, three-wire insulated. In insulated distribution systems, no current carrying part is to be earthed, other than: a) through an insulation level monitoring device b) through components used for the suppression of interference in radio circuits Earthed system with hull return Earthed systems with hull return are not permitted, with the following exceptions to the satisfaction of the Society: a) impressed current cathodic protective systems b) limited and locally earthed systems, such as starting and ignition systems of internal combustion engines, provided that any possible resulting current does not flow directly through any hazardous area c) insulation level monitoring devices, provided that the circulation current of the device does not exceed 30 ma under the most unfavourable conditions Earthed system without hull return Earthed systems without hull return are not permitted, with the following exceptions: a) earthed intrinsically safe circuits and the following other systems to the satisfaction of the Society b) power supplies, control circuits and instrumentation circuits in non-hazardous areas where technical or safety reasons preclude the use of a system with no connection to earth, provided the current in the hull is limited to not more than 5 A in both normal and fault conditions, or c) limited and locally earthed systems, such as power distribution systems in galleys and laundries to be fed through isolating transformers with the secondary windings earthed, provided that any possible resulting hull current does not flow directly through any hazardous area, or d) alternating current power networks of 1,000 V root mean square (line to line) and over, provided that any possible resulting current does not flow directly through any hazardous area; to this end, if the distribution system is extended to areas remote from the machinery space, isolating transformers or other adequate means are to be provided. 2 Earth detection 2.1 Monitoring of circuits in hazardous areas The devices intended to continuously monitor the insulation level of all distribution systems are also to monitor all circuits, other than intrinsically safe circuits, connected to apparatus in hazardous areas or passing through such areas. An audible and visual alarm is to be given, at a manned position, in the event of an abnormally low level of insulation. 3 Gas detection 3.1 Gas detection in enclosed spaces Permanently installed gas detectors are to be fitted in all hazardous areas including bunkering station, bunkering process room and other enclosed spaces containing gas piping or other equipment without ducting. October 2015 Bureau Veritas 19