Liquefied Petroleum Gases Bulk Storage Regulations (C.R.C., c. 1152)

35 (1) Except as provided in subsection (3), all openings in containers, except those for safety relief valves and those connections protected by an opening not larger than No. 54 drill size (0.0550 inch), shall be equipped with excess flow valves or other suitable automatic valves or devices which will automatically prevent loss of the tank contents in the event of a connection or line failure.

(2) Excess flow valves shall be designed with a by-pass not to exceed a No. 60 drill size (0.0400 inch) opening to allow equalization of pressure.

(3) An excess flow valve or other automatic device as prescribed in subsection (1) is not required for withdrawal connections of tanks with a water capacity of 1,500 Imperial gallons or less if the connection is protected by a controlling orifice not exceeding 5/16 inch diameter on vapour withdrawal and not exceeding 1/8 inch diameter on liquid withdrawal, a manually operated shut-off valve and pressure-reducing regulator, all of which are assembled to the connection as prescribed in 2.2(d), Division II of the 1958 edition of National Fire Protection Association Pamphlet No. 58.

(4) Excess flow valves shall be permanently marked or labelled by the manufacturer with their maximum working pressure, rated capacity, and the letters “LPG” to indicate suitability for use in liquefied petroleum gas service.

(5) Excess flow valves or other automatic devices, as referred to in subsection (1), shall be installed in such a manner that rupture of the line or connections will not adversely affect the protective device.

(6) The line or connection housing an excess flow valve shall have a greater capacity than the rated capacity of the excess flow valve.