CONTAINER VALVES, ACCESSORIES, AND DISCHARGE CONNECTIONS

Subpart 1. Excess flow valves. All vapor and liquid connections, except for pressure relief valves and those specifically exempted in part 1513.0150 , subparts 5 and 6, must be equipped with approved excess flow valves. Back-pressure check valves are acceptable in container filling connections. Alternatively, vapor and liquid connections covered by this subpart may be fitted with quick-closing internal valves which, except during operating periods, shall remain closed. If internal valves are not practical, external quick-closing valves may be used according to part 1513.0150 , subpart 6, and with appropriate protection as required in part 1513.0370 . Subp. 2. Pressure gauge. Each storage container must be provided with a pressure gauge graduated from 0 to 400 psig. Gauges must be designated for use in ammonia service. Subp. 3. Vapor equalizing connection. All containers must be equipped with a vapor equalizing connection.