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PDFWAC 296-307-48031

Operating procedures for cylinder manifolds.

(1) Cylinder manifolds must be installed under the supervision of someone familiar with the proper practices of construction and use.
(2) All component parts used in the methods of manifolding described in WAC 296-307-48023 must have the materials, design and construction approved either separately or as an assembled unit.
(3) All manifolds and parts used in methods of manifolding must be used only for the gas or gases for which they are approved.
(4) When acetylene cylinders are coupled, approved flash arresters must be installed between each cylinder and the coupler block. For outdoor use only, and when the number of cylinders coupled does not exceed three, one flash arrester installed between the coupler block and regulator is acceptable.
(5) Each fuel-gas cylinder lead should have a backflow check valve.
(6) The maximum aggregate capacity of fuel-gas cylinders connected to a portable manifold inside a building must be 3,000 cubic feet of gas.
(7) Acetylene and liquefied fuel-gas cylinders must be manifolded vertically.
(8) The pressure in the gas cylinders connected to and discharged simultaneously through a common manifold must be approximately equal.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-48031, filed 10/20/20, effective 11/20/20. Statutory Authority: RCW 49.17.040. WSR 98-24-096, § 296-307-48031, filed 12/1/98, effective 3/1/99. WSR 97-09-013, recodified as § 296-307-48031, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-48031, filed 10/31/96, effective 12/1/96.]
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