|(a) Transfer systems and pumps used for transfer of LNG and refrigerants shall be provided with means for precooling to reduce the effect of thermal shock and overpressure. (b) Check valves shall be provided as required to prevent backflow in transfer systems and shall be located as close as practicable to the point of connection to any system from which backflow might occur. (c) In addition to a locally mounted device to shut down the pump or compressor drive, a readily accessible, remotely located device shall be provided at least 25 feet away from the equipment to shut down the pump or compressor in case of emergency. The device shall be marked in accordance with the table in §14.2101 of this title (relating to Uniform Protection Requirements). Remotely located pumps and compressors used for loading or unloading tank vehicles shall be provided with shut-down controls at the transfer area and at the pump or compressor site. (d) Pressure gauges shall be installed on each pump and compressor discharge. (e) Valves shall be installed so that each pump or compressor can be isolated for maintenance. Where pumps or centrifugal compressors are installed for operation in parallel, each discharge line shall be equipped with a check valve. (f) Pumps and compressors shall be provided with pressure relief devices to limit the discharge pressure to their maximum allowable working pressure.