CSA LNG 2-2017 pdf download – Liquefied natural gas vehicle fuel containers.
4.3 Conditions requiring immediate inspections A tank involved in a collision, accident, fire, or other event that could have damaged the tank, shall be inspected in accordance with the manufacturer’s specified requirements if intended for further use. 4.4 Operating temperatures A tank shall be designed to operate at internal temperature ranging from –162 °C to +85 °C (–260°F to +185°F). 4.5 Material compatibility Materials and design shall be such that there will be no significant change in the functioning of the device, deformation or mechanical change in the device, and no harmful corrosion, deformation, or deterioration of the materials in the presence of LNG. Note: Inner vessel and outer jacket are generally austenitic stainless steel (see Annex B regarding general guidance for alternative materials). 4.6 External surfaces A tank’s external surfaces shall be designed to be resistant to environmental conditions. A tank shall be designed to operate with external temperatures ranging from –40 °C to +85 °C (–40°F to +185°F). This Standard does not address tank exposure to leakage from cargo that may be carried on vehicles. 5 Compliance 5.1 General A tank shall be designed, fabricated, and tested in accordance with one or more of the following requirements: a) DOT 4L (49 CFR 178.57), or TC4LM; b) ASME Boiler Pressure Vessel Code; c) UN ECE R110, EN 1251, or ISO 21029; or d) AS 1210. When an outer jacket is provided, it shall be provided with an over-pressure safety device to vent the annular insulation space, if pressure becomes excessive.
6 Material qualification tests and requirements All structural materials shall be traceable to the manufacturer’s certified test reports. Materials not in compliance with the manufacturer’s design specifications shall not be used. All metallic materials used in tank construction shall be listed per one of the following: a) ANSI/ASME B31.3; b) ASME Boiler and Pressure Vessel Code; c) API 620, Appendix Q; or d) EN 10028-7. The materials shall not be used below the minimum design temperature established in these standards. 7 Manufacture and production 7.1 General Manufacturing processes shall be the same as those used to produce the tanks subjected to design qualification tests, and shall be specified by the manufacturer in sufficient detail for consistency of production. 7.2 Welding Welded construction of a metal tank and liner is permitted. All welding shall be conducted in accordance with the Code or Standard selected in Clause 5.1. 7.3 Provisions for mounting and protection If mounting provisions and/or valve protecting shrouds are manufactured as part of the tank, they shall not be detrimental to the performance of the tank. 7.4 Pressure test Each inner vessel shall be subjected to the test pressure in accordance with the pressure test of the design standard(s) selected in Clause 5.1, and maintained for at least 30 seconds without evidence of leakage, visible distortion, or other defects.
8 Pressure reliefvalve 8.1 The manufacturer shall deliver the tank with pressure relief valves designed and manufactured in accordance with the Standard to which the LNG tank was designed and manufactured, per Clause 5. Pressure relief valves shall comply with the following requirements: a) each tank shall be protected by two pressure activated reseating relief valves in parallel as specified by the manufacturer; b) a secondary pressure relief valve, with higher set pressure than the primary relief valve, shall be installed on the tank to protect the tank upon failure of the primary pressure relief valve. 8.2 The pressure relief valves shall be: a) in direct contact with the vapor space of the tank when the tank is mounted. A shut-off valve shall not be located between the pressure relief valve and the tank; b) capable of relieving the tank pressure in the event of fire and loss of vacuum; c) able to relieve liquid and vapor at a sufficient rate to avoid an overpressure or liquid-full situation; and d) capable of operating at an LNG temperature of –162 °C (–260°F) and when exposed to fire without rupturing or becoming obstructed. 9 Records ofmanufacture The manufacturer shall record appropriate information on the materials, manufacturing processes, and test results for the fuel tank. These records shall be clear, legible, and in accordance with the standard(s) selected in Clause 5.1. CSA LNG 2-2017 pdf download.
