355 IAC 3-4-4 Container valves and appurtenances; construction

Sec. 4. (a) All containers shall be equipped with a fixed liquid level gauge. (b) All containers shall be equipped with: (1) a pressure indicating gauge having a dial graduated from zero (0) to four hundred (400) psig; and (2) an approved shutoff valve located between the gauge and the container. (c) Each filling connection on storage containers shall have a positive shutoff valve in conjunction with an approved back-pressure check valve. Vapor connections of each filling connection on storage containers shall have a positive shutoff valve together with an approved internal excess flow valve. Use of back-pressure check valves, whose internal safe operating condition is externally verifiable, is encouraged. (d) All containers shall be equipped with a suitable vapor equalizing connection. (e) All vapor and liquid connections, except pressure relief valves and those specifically exempt in section 5(c) and 5(d) of this rule, shall be equipped with approved excess flow valves or, in lieu thereof, may be fitted with approved quick-closing internal valves, which, except during operating periods, shall remain closed. For liquid lines at transfer locations used to fill nonstationary containers, use of excess flow valves, whose internal safe operating condition is externally verifiable, is encouraged. (f) All stationary storage installations shall have approved emergency shutoff valves installed in the liquid discharge piping of the transfer system. This requirement does not apply to fixed piping feeding a process system. The emergency shutoff valves shall be installed in the plant piping so that any break resulting from a pull will occur on the hose or swivel-type piping side of the connection while retaining intact the valves and piping on the plant side of the connection.