ASTM F3312/F3312M-23

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F3312/F3312M − 18 F3312/F3312M − 23 An American National Standard
Standard Practice for
Liquefied Natural Gas (LNG) Bunkering Hose Transfer
Assembly
This standard is issued under the fixed designation F3312/F3312M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice covers the minimum requirements for the design, manufacturing, and deployment of bunker hose transfer
assemblies for cryogenic service pertaining to bunkering of liquefied natural gas (LNG)-fueled vessels. The bunker hose transfer
assemblies addressed by this practice are for connections between the LNG-fueled vessel bunker manifold presentation flange
connections and the LNG supplier bunkering manifold presentation flange connections.
1.2 Transfer assemblies are suitable for use in multiple maritime bunkering applications, including but not limited to facilities,
vessels, trucks, and other LNG bunkering supply services. This practice will directly address the hose assembly, dry quick
disconnect couplings (DQD), breakaway couplings, gaskets, insulating flange, strainers, and associated fittings.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASME Standards:
ASME B16.5 Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
ASME B16.20 Metallic Gaskets for Pipe Flanges: Ring-Joint, Spiral-Wound, and Jacketed
ASME B36.19M Stainless Steel Pipe
ASME B31.3 Process Piping
2.2 ASTM Standards:
ASTM DS56L Metals and Alloys in the Unified Numbering System (UNS): 13th Edition
This practice is under the jurisdiction of ASTM Committee F25 on Ships and Marine Technology and is the direct responsibility of Subcommittee F25.11 on Machinery
and Piping Systems.
Current edition approved June 15, 2018Dec. 1, 2023. Published July 2018December 2023. Originally approved in 2018. Last previous edition approved in 2018 as
F3312/F3312M – 18. DOI: 10.1520/F3312_F3312M-18.10.1520/F3312_F3312M-23.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F3312/F3312M − 23
2.3 EN Standards:
EN 1474-1 Installation and Equipment for Liquefied Natural Gas. Design and Testing of Marine Transfer Systems. Design and
Testing of Transfer Arms
EN 1474-2 Installation and Equipment for Liquefied Natural Gas. Design and Testing of Marine Transfer Systems. Design and
Testing of Transfer Hoses
EN 1474-3 Installation and Equipment for Liquefied Natural Gas. Design and Testing of Marine Transfer Systems. Offshore
Transfer Systems
EN 13766 Thermoplastic Multi-Layer (Non-Vulcanized) Hoses and Hose Assemblies for the Transfer of Liquefied Petroleum
Gas and Liquid Nitrogen, Liquefied Natural Gas
2.4 IMO Regulations:
IGF Code International Code of Safety for Ships using Gases or other Low-Flashpoint Fuels
IGC Code International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk
2.5 ISGOTT Publications:
ISGOTT 5th Edition International Safety Guide for Oil Tankers and Terminals
2.6 ISO Standards:
ISO 527-1 Plastics — Determination of Tensile Properties — Part 1: General Principles
ISO 1402 Rubber and Plastics Hoses and Hose Assemblies — Hydrostatic Testing
ISO 1746 Rubber or Plastics Hoses and Tubing — Bending Tests
ISO 2768 General Tolerances
ISO 10380 Pipework — Corrugated Metal Hoses and Hose Assemblies
ISO 13934-1 Textiles — Tensile Properties of Fabrics — Part 1: Determination of Maximum Force and Elongation at Maximum
Force Using the Strip Method
ISO 14726:2008 Ships and Marine Technology — Identification Colours for the Content of Piping Systems
ISO TS 18683 Guidelines for Systems and Installations for Supply of LNG as Fuel to ShipsSafety and Risk Assessments of LNG
Bunkering Operations
ISO 21593:2019 Ships and marine technology — Technical requirements for dry-disconnect/connect couplings for bunkering
liquefied natural gas
ISO 20519:2017-0221593:2018-12 ShipsShip and Marine Technology — Specification for Bunkering of Liquefied Natural Gas
Fuelled VesselsTechnical Requirements for Liquid Natural Gas Bunkering Dry-Disconnect/Connect Coupling
2.7 MSS Standards:
MSS SP-43-2003 Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications
2.8 USCG Policy:
CG-521 Policy Letter No. 01-12, CH-1 Equivalency Determination – Design Criteria For Natural Gas Fuel Systems (Change-1)
CG-ENG Policy Letter No. 02-15 Design Standards for U.S. Barges Intending to Carry Liquefied Natural Gas in Bulk
CG-OES Policy Letter No. 01-15 Guidelines for Liquefied Natural Gas Fuel Transfer Operations and Training of Personnel on
Vessels Using Natural Gas as Fuel
CG-OES Policy Letter No. 02-15 Guidance Related ro Vessels and Waterfront Facilities Conducting Liquefied Natural Gas
(LNG) Marine Fuel Transfer (Bunkering) Operations
Available from European Committee for Standardization (CEN), Avenue Marnix 17, B-1000, Brussels, Belgium, http://www.cen.eu.
Available from International Maritime Organization (IMO), 4, Albert Embankment, London, SE1 7SR, United Kingdom, http://www.imo.org.
Available from International Organization for Standardization (ISO), ISO Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
Switzerland, http://www.iso.org.
Available from Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), 127 Park St., NE, Vienna, VA 22180-4602, http://www.mss-hq.org.
Available from United States Coast Guard (USCG), 2703 Martin Luther King Jr Ave SE, Washington, DC, 20593-700, https://www.uscg.mil.
F3312/F3312M − 23
3. Terminology
3.1 Definitions:
3.1.1 breakaway coupling, n—coupling which separates at a predetermined section when required and each separated section
contains a self-closing shut-off valve which seals automatically.
3.1.2 design pressure, n—the pressure to which each piping component of a piping system is designed.
3.1.3 design temperature, n—the temperature at which each piping component is designed to operate.
3.1.4 dry quick disconnect (DQD), n—a device designed to make a quick, secure connection and disconnection between a hose
and pipe, two pipes or between two hoses.
3.1.5 flange, n—a joint in a bolted connection.
3.1.6 insulating flange, n—a flanged joint incorporating an insulating gasket, sleeves, and washers to prevent electrical continuity
between ship and shore.
3.1.7 gasket, n—a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from
or into the joined objects while under compression.
3.1.8 hose assembly, n—components of the hose including inner liquid barriers, reinforcement, protective covers, and end
configurations like flange or threads that have been assembled and tested to meet specification requirements.
3.1.9 maximum allowable working pressure (MAWP), n—the maximum pressure of a piping system determined, in general, by the
weakest piping component in the system or by the relief valve setting.
3.1.9.1 Discussion—
The MAWP is not to exceed the design pressure.
3.1.10 polytetrafluoroethylene (PTFE) reinforced gasket material, n—a flat gasket material made from PTFE with special fillers
designed to increase the materials tensile properties and decrease the creep relaxation that can occur with virgin PTFE material
in cryogenic applications.
3.1.11 presentation flange, n—the last permanent flange at the transfer manifold of both the bunker receiver and supplier.
3.1.12 seal, n—a mechanical device that helps join mechanisms together by preventing leakage, containing pressure, or preventing
contamination.
3.1.12.1 Discussion—
In most cases a seal is dependent on compression between a compressible material or device and solid mating surface.
3.1.13 spiral wound gasket, n—a gasket categorized as semi-metallic gasket consisting of sealing elements formed by winding two
materials (one for sealing, one for resilience) into thin v-shaped spirals.
3.1.14 transfer assembly, n—liquid or vapor transfer assembly, components of the transfer system that include the hose assembly,
dry quick disconnect couplings (DQD), breakaway couplings, insulating flange, and gaskets that connect the bunker supply of LNG
to the bunker manifold of an LNG-fueled vessel.
3.2 Acronyms:
3.2.1 ISO—International Organization for Standardization
3.2.2 LNG—liquefied natural gas
3.2.3 MAWP—maximum allowable working pressure
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3.2.4 PPE—personal protective equipment
3.2.5 SGMF—The Society for Gas as a Marine Fuel
3.2.6 USCG—United States Coast Guard
4. Significance and Use
4.1 This practice provides guidance on the minimum requirements for the design, manufacture, installation, and operation of
bunker hose transfer assemblies for cryogenic service pertaining to bunkering of LNG-fueled vessels. The bunker hose transfer
assemblies addressed by this practice are for connections between the LNG-fueled vessel bunker manifold presentation flange
connections and the LNG supplier bunkering manifold presentation flange connections.
5. Transfer Assembly
5.1 The bunker hose transfer assemblies are connections between the receiving LNG-fueled vessel bunker manifold and the LNG
supplier bunkering manifold. A bunker hose transfer assembly may be for either a liquid natural gas transfer or a combination of
liquid and vapor transfer. The transfer system assembly consists of numerous components which may include but not limited to
the hose assembly, DQD breakaway couplings, insulating flange, strainers, gaskets, and associated fittings.
5.2 Materials:
5.2.1 Examples of approved materials are but not limited to 9 % nickel steel, type 304, 304L, 316, 316L, 321, and 347 solution
treated stainless steel and aluminum alloy such as type 5083 annealed. steel.
5.3 Physical Properties:
5.3.1 All materials must be capable of withstanding cryogenic temperatures of –320°F [–196°C]–320 °F [–196 °C] found in liquid
nitrogen. The use of liquid nitrogen is commonly used for the testing of components with a non-volatile cryogenic liquid or vapor.
Common usages would include cool down of equipment before the LNG transfer and in purging cycles. All components shall be
employed in accordance with the recognized standards (inch-pound and SI) and applicable regulations as referenced in Section 2.
5.4 Design:
5.4.1 The transfer assembly is to have an internal MAWP at least 150 PSIG [10.34 BAR].
5.4.2 The design pressure is not to be less than the pressure of the most severe condition of coincidental internal or external
pressure and temperatures (maximum or minimum) expected during service. However, this practice does impose a specific
minimum design pressure that has the potential to exceed the maximum expected service pressurepressure.
5.4.3 The design temperature is not to be greater or less than the temperature of the piping component material at the most severe
condition (maximum or minimum) of temperature and coincidental pressure expected during service.
5.4.4 Suitable means shall be provided to relieve the pressure and remove LNG from any piping between the outermost manifold
valves and bunker hoses to the tanks, or other suitable location, prior to disconnection.
5.4.5 Means are to be provided for the elimination of any sparks or static electricity when bunkering systems are in use, connected
or disconnected. The hose, pipes, and transfer system components shall be electrically continuous, but shall be electrically insulated
from the vessel receiving the bunker and compliant with a recognized standard, see 5.7.
5.5 Fittings:
5.5.1 The selection of the proper fittings for all cryogenic applications needs are to be in accordance with the following:
5.5.1.1 Welding (ASME B31.3).
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5.5.1.2 National Pipe Thread (NPT) (ASME B31.3).
5.5.1.3 Flange bolting dimensions (ASME B16.5).
5.5.1.4 JIC threaded connections for sizes 1 in. [25 mm] and below.
5.5.1.5 Floating flange and turn back nipples as in accordance with MSS SP-43 as part of ASME B36.19M.
5.6 Gaskets:
5.6.1 The gaskets must be capable of maintaining a seal at temperatures as low as –320°F [–196°C].–320 °F [–196 °C].
5.6.2 Spiral wound gaskets are to comply with ASME B16.20.
5.6.3 Virgin PTFE shall not be used as it susceptible to creep and can be displaced during thermal cycling.
5.6.4 The gaskets are to be fabricated of compound materials. This would include ‘semi-metal’ gaskets containing expanded
graphite or PTFE filler or expanded PTFE with multi directional strength.
5.6.5 Gaskets are to be used in accordance with manufacturer recommendations. To mitigate the risk of spraying leaks, flange
connections must be protected by a spray shield.
5.6.6 Gaskets need to be regularly inspected.
5.6.7 Gasketed pipe joints and hose connections shall generally be electrically bonded. However, an approved insulating flange
shall be in a section of the hose string between the bunker supply and the vessel receiving the bunker fuel (refer to 5.7 of this
practice).
5.7 Insulating Flange:
5.7.1 The use of an approved insulating flange shall be in a section of the hose string between the bunker supply and the vessel
receiving the bunker. The specification of this insulation flange can be found in ISO 20519, Section 5.5.6, and ISGOTT, 17.5.5.
5.8 Strainer:
5.8.1 Strainers shall be placed in use as close to the bunkering manifolds as possible.
5.8.2 Strainers are to be made of materials that will be suitable for the cryogenic temperatures found in LNG transfer, nitrogen
testing, cool down, and purging operations.
5.8.3 The proper sizing of strainers shall be employed to protect the valves, pumps, and engine components from damage causing
dirt, debris, and ice.
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5.9 Dry Quick Disconnects (DQD):
5.9.1 A DQD is a device that will allow for quick connection or separation of the vessel from its bunker supply in the event of
an emergency, while providing protection for the operators, vessel, and the environment.
5.9.2 The design of a DQD, will consider the trapped liquid volume. A hose or pipe fitted with a DQD will be considered as a
valve in a pipe section. A thermal protection device is to be fitted due the possibility of trapped liquid between a DQD and a valve.
(Refer to Appendix X1 for sample diagram.)
5.9.3 A DQD designed for bunker application shall meet with the criteria established in ISO 20519. An example of the presentation
flange connection dimensions is found in the Annex A1 and Annex A2ISO TS 18683.
5.9.4 There shall be no visible leak of liquid or vapor from the DQD connection.
5.9.5 The design of the DQD shall minimize the potential for valves or poppets from being stuck in an open position.
5.9.6 The DQD must prevent the loss of vapor or liquid LNG during the connection and disconnection process.
5.9.6.1 The placement of a DQD in service shall be such that any LNG liquid or vapor expelled is directed in a safe manner away
from personnel and critical structures or equipment.
5.9.7 The DQD shall allow for emergency disconnects while at full operating pressures. During emergency the DQD will be
capable of disconnecting at operational pressure with nominimal loss of liquid or vapor and no risk to operators, equipment, or
the vessel.
5.9.8 The DQD shall be designed and tested to a minimum of a 4 to 1 safety factor. The DQD shall not be deformed or suffer any
leaks beyond what are established as considered normal operation.
5.10 Breakaway Couplings:
5.10.1 A breakaway coupling is used to prevent damage to LNG bunker system and allow for a safe separation of the transfer
assembly and to provide a means to make an emergency separation of the bunker supply and bunker receiver while shutting off
the flow and loss of LNG liquid and vapor. A breakaway coupling can be activated automatically by excessive forces or though
mechanical/hydraulicthrough mechanical/pneumatic/hydraulic controls.
5.10.2 The design of the breakaway coupling will consider the trapped liquid volume. A hose or pipe fitted with a breakaway
coupling will have the same considerations as a valve in a pipe section. A thermal protection device is to be fitted due the possibility
of trapped liquid between the breakaway coupling and a valve. (See sample diagram Fig. X1.1.)
5.10.3 The design of the breakaway coupling shall minimize the potentia
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