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1910.253(c)(5) Manifold Operating Procedures
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Cylinder manifolds shall be installed under the supervision of someone familiar with the proper practices with reference to their construction and use.
When acetylene cylinders are coupled, approved flash arresters shall 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.
The aggregate capacity of fuel-gas cylinders connected to a portable manifold inside a building shall not exceed 3,000 cubic feet (84 m(3)) of gas.
Acetylene and liquefied fuel-gas cylinders shall be manifolded in a vertical position.
The pressure in the gas cylinders connected to and discharged simultaneously through a common manifold shall be approximately equal.
All manifolds and parts used in methods of manifolding shall be used only for the gas or gases for which they are approved.
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