LNG bunkering ship October 2015 Rule Note NR 620 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 Website: http://www.veristar.com Email: veristarinfo@bureauveritas.com 2015 Bureau Veritas - All rights reserved
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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. 13.2. - The invalidity of one or more stipulations of the present General Conditions does not affect the validity of the remaining provisions. 13.3. - 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
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
Section 1 General 1 General 7 1.1 Application 1.2 Scope 1.3 Exclusion 1.4 Classification notations 2 References 7 2.1 Acronyms 2.2 Definitions 2.3 Referenced documents 3 Document to be submitted 9 3.1 General 4 Tests and trials 9 4.1 LNG transfer system trials in working condition Section 2 Ship Arrangement 1 General design requirements 10 1.1 Risk analysis 1.2 Hazardous area 2 Material requirements 10 2.1 General 3 Arrangement of bunkering system 10 3.1 LNG bunkering station 3.2 Bunkering control station 4 Ventilation in closed or semi- enclosed spaces 11 4.1 General Section 3 Hull and Stability 1 Location of cargo tanks 12 1.1 General Section 4 Transfer Systems 1 General 13 1.1 Application 1.2 Requirements 2 Hoses 13 2.1 General 2.2 Design requirements 2.3 Type approval of bunkering hose 2 Bureau Veritas October 2015
2.4 Type approval testing 2.5 Workshop Testing 2.6 Survey requirements 2.7 Hoses onboard 3 Quick connect disconnect coupler (QCDC) 15 3.1 Type approval of QCDC 3.2 Type testing 3.3 Workshop testing 4 Break-away and emergency release coupling (ERC) 15 4.1 General 4.2 Type approval of break-away and ERC 4.3 Type testing 4.4 Workshop testing 5 Electrical isolation flanges 15 5.1 General 6 Supports 16 6.1 General 6.2 Transfer arm 7 Swivels 16 7.1 General 8 Auxiliary equipment 16 8.1 General 9 LNG transfer system 16 9.1 General 9.2 Testing of the complete system 10 Bunkering transfer rate 16 10.1 General 10.2 Sampling 11 Arrangement for draining the LNG transfer lines 17 11.1 General 12 Compatibility between receiving ship and bunkering ship 17 12.1 General Section 5 Inert Gas Systems 1 General 18 1.1 Application 1.2 Requirements Section 6 Electrical Installations and Instrumentation 1 General 19 1.1 Application 1.2 System of supply October 2015 Bureau Veritas 3
2 Earth detection 19 2.1 Monitoring of circuits in hazardous areas 3 Gas detection 19 3.1 Gas detection in enclosed spaces 3.2 Gas detection in open areas 4 Emergency shut-down systems (ESD) 20 4.1 Section 7 Automation Systems 1 General 21 1.1 Application 1.2 Emergency shut-down systems (ESD) 1.3 Alarms and safety actions 1.4 Communication systems Section 8 Fire Safety 1 General 22 1.1 Application 1.2 Water Spray systems 1.3 Dry chemical powder 2 Fire protection 22 2.1 3 Fire extinction 22 3.1 Water spray systems 3.2 Dry chemical powder fire-extinguishing system Section 9 Additional Service Features 1 Additional service feature RE 23 1.1 General 2 Additional service feature IG-Supply 23 2.1 General 3 Additional service feature Initial-CD 23 3.1 General 4 Additional service feature BOG 23 4.1 General 4.2 Vapour return line 4 Bureau Veritas October 2015
Appendix 1 Risk Analysis 1 General 24 1.1 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 24 2.1 General 2.2 LNG transfer system 2.3 Gas detection system 2.4 Control monitoring and safety systems 3 Unexpected events to be analysed 24 3.1 LNG leakage 3.2 Risk related to the receiving ship 3.3 Black-out October 2015 Bureau Veritas 5
6 Bureau Veritas October 2015
NR 620, Sec 1 SECTION 1 GENERAL 1 General 1.1 Application 1.1.1 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]. 1.1.2 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) 1.1.3 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 1.2.1 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 1.3.1 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 9. 1.4 Classification notations 1.4.1 Service notation Ships complying with the requirements of this Rule Note are to be granted the service notation LNG bunkering ship. 1.4.2 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 6.10.4. BOG, where the ship is designed to recover and manage the boil-off gas generated during the bunkering operation. 2 References 2.1 Acronyms 2.1.1 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 2.2.1 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
NR 620, Sec 1 2.2.2 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). 2.2.3 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. 2.2.4 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). 2.2.5 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. 2.2.6 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. 2.2.7 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. 2.2.8 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. 2.2.9 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. 2.2.10 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. 2.2.11 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. 2.2.12 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. 2.2.13 Receiving ship A receiving ship is a ship receiving LNG as fuel. 2.2.14 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. 2.2.15 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. 2.2.16 Transfer arm Transfer arm refers to any system allowing supporting a hoses or rigid pipes during bunkering operations. 8 Bureau Veritas October 2015
NR 620, Sec 1 2.3 Referenced documents 2.3.1 Ship Rules Ship Rules means Rules for the Classification of Steel Ships (NR467). 2.3.2 NR320 NR320 means the latest version of NR320 Certification Scheme of Materials and Equipment for the Classification of Marine Units. 2.3.3 NR216 NR216 means the latest version of NR216 Rules on Materials and Welding for the Classification of Marine Units. 2.3.4 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. 2.3.5 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. 2.3.6 SOLAS Convention SOLAS Convention means the International Convention for the Safety of Life at Sea, 1974, as subsequently amended. 2.3.7 IEC 60092-502 IEC 60092-502 means the International Electrotechnical Commission standard: Electrical installations in ships (Part 502: Tankers - Special features). 3 Document to be submitted 3.1 General 3.1.1 The drawing and related information to be submitted are listed in Tab 2, and, as relevant, in Sec 9. 3.1.2 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 4.1.1 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
NR 620, Sec 2 SECTION 2 SHIP ARRANGEMENT 1 General design requirements 1.1 Risk analysis 1.1.1 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 1. 1.2 Hazardous area 1.2.1 General The hazardous areas are to be in accordance with IGC Code, regulation 1.3.17. 1.2.2 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. 1.2.3 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 60092-502, paragraph 4.1. A type approved gastight bulkhead penetration device is not considered as a source of release. 2 Material requirements 2.1 General 2.1.1 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 NR216. 3 Arrangement of bunkering system 3.1 LNG bunkering station 3.1.1 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. 3.1.2 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. 3.1.3 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. 3.1.4 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 3.2.1 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. 3.2.2 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
NR 620, Sec 2 4 Ventilation in closed or semienclosed spaces 4.1 General 4.1.1 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. 4.1.2 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. 4.1.3 Ventilation ducts shall have the same area classification as the ventilated space. 4.1.4 Ventilation capacity is to be in accordance with paragraph 12.1.2 of IGC Code. October 2015 Bureau Veritas 11
NR 620, Sec 3 SECTION 3 HULL AND STABILITY 1 Location of cargo tanks 1.1 General 1.1.1 The location of cargo tanks are to be in accordance with requirements of IMO resolution MSC.370(93), Chapter 2, paragraph 2.4. 12 Bureau Veritas October 2015
NR 620, Sec 4 SECTION 4 TRANSFER SYSTEMS 1 General 1.1 Application 1.1.1 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 1.2.1 The LNG transfer system is to include a Quick Connect Disconnect Coupler (QCDC), a Break-away coupling or a ERC and insulation flanges. 1.2.2 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]. 1.2.3 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 2.1.1 The requirements of IGC Code, in particular paragraph 5.7, are to be fulfilled. 2.2 Design requirements 2.2.1 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). 2.2.2 Maximum design pressure The maximum design pressure is not to be less than 10 bar in accordance with paragraph 5.7.3 of IGC Code. 2.2.3 Materials All materials are to be compatible with each other and with the fluid conveyed (LNG and LNG vapours). 2.2.4 End connection and coupling The end fittings are to be made of stainless steel and be in accordance with IGC Code or NR216. 2.3 Type approval of bunkering hose 2.3.1 Bunkering hoses are to be type approved by the Society. 2.3.2 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 2.4.1 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. 2.4.2 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 2 000 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. 2.4.3 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. 2.4.4 Bending cycle fatigue test The hose assembly is to be subjected to a bending cycle fatigue test, at ambient and cryogenic temperature, with 400 000 cycles without failure. The fatigue bend radius is to be in accordance with designer recommendation. October 2015 Bureau Veritas 13
NR 620, Sec 4 2.4.5 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. 2.4.6 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. 2.4.7 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. 2.4.8 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. 2.4.9 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. 2.4.10 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 25 000 Ω. 2.5 Workshop Testing 2.5.1 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). 2.5.2 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. 2.5.3 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. 2.5.4 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 2.6.1 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. 2.6.2 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 2.7.1 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. 2.7.2 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
NR 620, Sec 4 2.7.3 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 3.1.1 QCDC are to be type approved by the Society. 3.1.2 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 3.2.1 The QCDC is to be subjected to a type test to confirm the release performance under ice built up condition. 3.3 Workshop testing 3.3.1 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 4.1.1 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. 4.1.2 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. 4.1.3 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. 4.1.4 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. 4.1.5 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 4.2.1 Break-away and ERC are to be type approved by the Society. 4.2.2 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 4.3.1 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. 4.3.2 The break-away or the ERC are to be subjected to a type test to confirm the release performance under ice built up condition. 4.3.3 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 4.4.1 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 5.1.1 Each insulation flange is to be subjected to a test of electrical resistance in air and the resistance is to be not less than 10 000Ω. October 2015 Bureau Veritas 15
NR 620, Sec 4 5.1.2 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 6.1.1 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 6.2.1 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 7.1.1 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. 7.1.2 Static resistance test Pressure swivels are to be subjected to a pressure resistance static test, according to its design code. 7.1.3 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 9.1.1 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 9.2.1 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. 9.2.2 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 10.1.1 The bunkering transfer rate is to be kept within the capabilities of the receiving ship. 10.1.2 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. 10.1.3 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 8.1.1 The auxiliary equipment, as defined in Sec 1, [2.2.1] are to be in accordance with Ship Rules. 10.2 Sampling 10.2.1 Connections for taking LNG samples are to be in accordance with IGC Code and Ship Rules. 16 Bureau Veritas October 2015
NR 620, Sec 4 11 Arrangement for draining the LNG transfer lines 11.1 General 11.1.1 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 12.1.1 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
NR 620, Sec 5 SECTION 5 INERT GAS SYSTEMS 1 General 1.2 Requirements 1.1 Application 1.1.1 This Section covers the inert gas systems for purging the bunkering lines. 1.2.1 The inert gas systems are to be in accordance with the requirements 9.5 of the IGC Code. 1.2.2 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
NR 620, Sec 6 SECTION 6 ELECTRICAL INSTALLATIONS AND INSTRUMENTATION 1 General 1.1 Application 1.1.1 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. 1.1.2 In case of conflict between this Section and IGC Code, the Society is to be consulted for clarification. 1.2 System of supply 1.2.1 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. 1.2.2 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. 1.2.3 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 2.1.1 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 3.1.1 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