UL 147A-2009 pdf download – Nonrefillable (Disposable) Type Fuel Gas Cylinder Assemblies.
6.3 A nonrefillable cylinder shall be designed for vapor withdrawal in its position of normal use. The cylinder shall not have provisions for liquid withdrawal. 6.4 A nonrefillable cylinder assembly shall be made of corrosion-resistant material or be provided with a corrosion-resistant exterior coating equivalent to that afforded by paint. 7 Assembly 7.1 A nonrefillable cylinder assembly shall include all of the components required for its intended function and installation, and shall be furnished as a single unit or assembly. 7.2 The cylinder assembly shall be provided with an integral shutoff valve that closes automatically when the cylinder assembly is disconnected from the gas-consuming equipment. 7.2 revised March 1 7, 2005 7.3 The valve stem shall be recessed, or otherwise protected so that the valve is not subjected to direct impact when the container is dropped onto a flat surface. 7.3 added March 1 7, 2005 7.4 The cylinder assembly shall incorporate a Type CGA No. 600 connection in accordance with the Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections, CGA V-1 -2003. 7.4 revised March 1 7, 2005 7.5 A nonrefillable metal container assembly shall incorporate pressure relief device(s) or system(s) that will operate to reduce the risk of rupture or propulsion of container parts from pressure buildup from a fire condition. See the Fire Test, Section 1 4. 7.5 added March 1 7, 2005
8.5 If atmospheric corrosion of a ferrous part impairs the intended operation, the part shall be provided with a corrosion-resistant protective coating. 8.5 revised March 1 7, 2005 8.6 A protective coating shall resist corrosion to the degree not less than that provided by the protective coatings specified in 8.7. 8.7 Cadmium plating shall have a thickness of not less than 0.0003 inch (0.008 mm), and zinc plating shall have a thickness of not less than 0.0005 inch (0.01 3 mm). Exception: When threads constitute the major portion of the area of a part, the thickness of the cadmium or zinc plating shall not be less than 0.0001 5 inch (0.0038 mm). 8.8 A fuel-confining part of an inlet or relief valve that is made of drawn brass or machined from a brass rod made of copper alloy containing more than 1 5 percent zinc and incorporating internal threads shall withstand without cracking, the 1 0-Day Moist Ammonia-Air Stress Cracking Test, Section 20. 8.9 Parts made of metals having widely varying coefficients of thermal expansion and exposed to heat shall not be used in combination when threaded together with the intent to reduce the risk of external leakage of fuel. 8.1 0 Copper or brass materials containing more than 67 percent copper shall not be used for parts in contact with MPS-Gas. 8.1 1 A brazing material used for joining parts of a cylinder assembly shall have a melting point (solidus temperature) not less than 1 000°F (538°C).