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 296-307-41509 - Additional requirements that apply to cylinder system installed indoors

Current through Register Vol. 24-14, July 15, 2024
(1) When portable
				  containers are necessary and it is not practical to use them outdoors,
				  containers and equipment may be used indoors only if they meet the requirements
				  of this section.
(a)
Containers in
				  use
.
Connected for use.
(b) Systems using containers with a water
				  capacity greater than 2-1/2 pounds (nominal one pound LP-gas capacity) must
				  have excess flow valves. Such excess flow valves must be either integral with
				  the container valves or in the connections to the container valve outlets. In
				  either case, an excess flow valve must be installed so that any strain beyond
				  the excess flow valve will not cause breakage between the container and the
				  excess flow valve. The installation of excess flow valves must take into
				  account the type of valve protection provided.
(c) Regulators must be either directly
				  connected to the container valves or to manifolds connected to the container
				  valves. The regulator must be suitable for use with LP-gas. Manifolds and
				  fittings connecting containers to pressure regulator inlets must be designed
				  for at least 250 psig service pressure.
(d) Valves on containers having a water
				  capacity greater than fifty pounds (nominal twenty pounds LP-gas capacity) must
				  be protected while in use.
(e)
				  Aluminum pipe or tubing is prohibited.
(f) Hose must be designed for a working
				  pressure of at least 250 psig. Hose and hose connections must be listed by a
				  nationally recognized testing laboratory.
(i)
				  Hose must be as short as practical.
(ii) Hose must be long enough to allow
				  required spacing without kinking, straining, or allowing hose to be close
				  enough to a burner to be damaged by heat.
(g) Portable heaters, including salamanders,
				  must have an approved automatic device to shut off the flow of gas to the main
				  burner, and pilot if used, in case the flame goes out. Heaters with inputs
				  above 50,000 Btu manufactured on or after May 17, 1967, and heaters with inputs
				  above 100,000 Btu manufactured before May 17, 1967, must have either:
(i) A pilot that must be lighted and proved
				  before the main burner can be turned on; or
(ii) An electric ignition system;
(iii) Container valves, connectors,
				  regulators, manifolds, piping, and tubing must not be used as structural
				  supports for heaters.
Exception:
These requirements do not apply to tar kettle burners,
							 torches, melting pots, nor do they apply to portable heaters under 7,500 Btuh
							 input when used with containers with a maximum water capacity of 2-1/2
							 pounds.
(h) Containers, regulating equipment,
				  manifolds, piping, tubing, and hose must be located to minimize exposure to
				  abnormally high temperatures (such as may result from exposure to convection or
				  radiation from heating equipment or installation in confined spaces), physical
				  damage, or tampering.
(i) Heat
				  producing equipment must be located and used to minimize the possibility of
				  igniting combustibles.
(j)
				  Containers with water capacity greater than 2-1/2 pounds (nominal one pound
				  LP-gas capacity) connected for use, must stand on a firm and substantially
				  level surface and, when necessary, must be secured in an upright
				  position.
(k) Containers, including
				  the valve protective devices, must be installed to minimize the probability of
				  impingement of discharge of safety-relief devices upon containers.