|(a) Piping materials, including gaskets and thread compounds, shall be suitable for use with LNG throughout the range of temperatures to which they will be subjected. The temperature limitations for pipe materials shall be as specified in ANSI B31.3. (b) Piping which would be exposed during an emergency to the cold of an LNG or refrigerant spill or the heat of an ignited spill when either exposure could result in a failure of the piping which would significantly increase the emergency shall be: (1) made of material that is suitable for both its normal operating temperature and the extreme temperatures to which it might be subjected during an emergency; (2) protected by insulation or other means to delay failure due to such extreme temperatures until corrective action may be taken by the operator; or (3) capable of being isolated and having the flow stopped in piping that would be exposed only to the heat of an ignited spill during the emergency. (c) Piping insulation used in areas where the mitigation of fire exposure is necessary shall be made of material which will not propagate fire and shall maintain any properties which are necessary during an emergency when exposed to fire, heat, cold, or water. (d) Furnace lap-weld, furnace butt-weld, cast iron, malleable iron, and ductile iron pipe shall be prohibited. (e) When longitudinal or spiral weld pipe is used (welded with or without filler metal), the weld and heat-affected zone shall comply with ANSI B31.3, 323.2.2, and §14.2419 of this title (relating to Welding at Piping Installations). (f) Threaded pipe shall be at least schedule 80. (g) A liquid line, excluding loading arms or hoses, on a storage container, cold box, or other major item of insulated equipment external to the outer shell or jacket whose failure can release a significant quantity of flammable fluid shall not be made of aluminum, copper, or copper alloy, or other material which has low resistance to flame temperatures unless such material is protected against fire exposure. Transition joints may be used if they are protected against fire exposure.