|(a) Transport vehicle loading and unloading facilities shall meet the following requirements: (1) Rack structures shall be constructed of noncombustible material such as steel or concrete. (2) Transfer piping, pumps, and compressors shall be installed with the following protective measures: (A) protection from damage from vehicle movements in compliance with the guardrail and fencing requirements of §14.2101 of this title (relating to Uniform Protection Requirements); (B) isolation valves at both ends of containers with less than 2,000 gallon capacity, and a remote operating valve, automatic closure, or check valve to prevent backflow on containers of 2,000 gallons or more capacity; (C) isolation valving and bleed connections to depressurize hoses and arms and minimize venting before disconnecting; (D) hoses and arms equipped with a shutoff valve at the free end; (E) a check valve on piping for liquid transfer to minimize accidental release; and (F) a line relief valve between every pair of isolation valves. (3) Where multiple products are loaded or unloaded at the same location, loading arms, hoses, and manifolds shall be marked to indicate the product or products handled by each system. (4) Operating status indicators shall be provided in the transfer area. (b) Written procedures covering normal transfer and emergency operating procedures shall be available for all transfer operations. The procedures shall be kept current and available to all employees engaged in transfer operations. (c) Prior to beginning transfer operations, the following checks shall be made: (1) Gauge readings shall be obtained or inventory established to prevent overfilling of the receiving vessel. (2) Transfer connections shall be checked to ensure they are gastight and liquidtight. (3) Unless required for transfer operations, LNG or flammable liquid transport vehicle engines shall be turned off. Brakes shall be set and wheels chocked to prevent movement of the vehicle prior to connecting for transfer. The engine shall not be started until the transport vehicle has been disconnected and any released vapors have dissipated. (4) Prior to loading LNG into a transport vehicle tank which does not have a positive pressure or is not in exclusive LNG service, a test shall be made to determine the oxygen content in the receiving container. If the oxygen content in either case exceeds 1.0% by volume, the container shall not be loaded until suitably purged. (5) An LNG transport vehicle shall be positioned prior to transfer so that it can exit the area without backing when the transfer operation is complete. (d) During transfer operations, the following checks shall be made: (1) Levels shall be checked during the transfer operations. (2) Pressure and temperature conditions shall be observed during the transfer operations. If any unusual variance in pressure occurs, transfer shall be stopped until the cause has been determined and corrected. (e) No repair shall be performed on the transfer system while transfer is taking place.