Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-307 - Safety standards for agriculture › SPECIALIZED OPERATIONS › Part U-2 - Hazardous Materials - Liquified Petroleum Gas › Section 296-307-42509 - Valves and accessories

Current through Register Vol. 24-14, July 15, 2024
(1)
				  Container valves and accessories must have a rated working pressure of at least
				  250 psig, and must be suitable for LP-gas service.
(2) The filling connection must be fitted
				  with an approved double back-pressure check valve, or a positive shutoff in
				  conjunction with an internal back-pressure check valve. On a removable
				  container the filler valve may be a hand operated shut-off valve with an
				  internal excess flow valve. Main shut-off valves on the container on liquid and
				  vapor must be readily accessible.
(3) Filling connections equipped with
				  approved automatic back-pressure check valves, and safety-relief valves, all
				  connections to the containers having openings for the flow of gas in excess of
				  a No. 54 drill size must have approved automatic excess flow valves to prevent
				  discharge of content in case connections are broken.
(4) Liquid-level gauging devices must meet
				  the following requirements:
(a) Variable
				  liquid-level gauges that require the venting of fuel to the atmosphere are
				  prohibited on fuel containers of industrial trucks (including lift
				  trucks).
(b) On portable containers
				  that may be filled in the vertical and/or horizontal position, the fixed
				  liquid-level gauge must indicate maximum permitted filling level for both
				  vertical and horizontal filling with the container oriented to place the
				  safety-relief valve in communication with the vapor space.
(c) For containers used solely in farm
				  tractor service and charged at a point at least 50 feet from any important
				  building, the fixed liquid-level gauging device may be constructed so that the
				  outward flow of container content exceeds that passed by a No. 54 drill size
				  opening, but must never exceed that passed by a No. 31 drill-size opening. An
				  excess flow valve is not required. Fittings equipped with restricted drill size
				  opening and the container on which they are used must be marked to indicate the
				  size of the opening.
(d) All valves
				  and connections on containers must be adequately protected to prevent damage
				  due to accidental contact with stationary objects or from loose objects thrown
				  up from the road. All valves must be safeguarded against damage due to
				  collision, overturning or other accident. Farm tractors where parts of the
				  vehicle provide protection to valves and fittings meet this requirement.
				  However, on removable type containers the protection for the fittings must be
				  permanently attached to the container.
(e) The employer should normally exchange
				  removable fuel outdoors. When removable fuel containers are used, means must be
				  provided in the fuel system to minimize the escape of fuel when the containers
				  are exchanged. The employer must use one of the following methods:
(i) Using an approved automatic quick-closing
				  coupling (a type closing in both directions when uncoupled) in the fuel line;
				  or
(ii) Closing the valve at the
				  fuel container and allowing the engine to run until the fuel in the line is
				  consumed.