UL 147-2015 pdf download – Hand-Held Torches For Fuel Gases.
6 Connections 6.1 The inlet of the torch unit other than a torch unit with integral container assembly shall comply with the requirements for a CGA No. 600 connection in accordance with the Compressed Gas Association Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections, ANSI/CGA V-1 . Exception: A torch unit that incorporates another type of inlet connection need not comply with this requirement if the torch unit is marked in accordance with 24.2 and the operating instructions include directions for leak free connection to the specific type and model designation of fuel container. 6.2 The hose connection for LP-Gas hose shall be provided with a CGA 51 0, CGA 791 , or CGA 81 0 (Type I or Type II) outlet connection complying with the Standard for Compressed Gas Cylinder Valve Outlet and Inlet Connections, ANSI/CGA V-1 .
7 Materials 7.1 Materials shall be resistant to the action of the liquid to which they will be exposed in service. 7.2 With reference to the requirement in 7.1 , elastomeric and polymeric materials shall be subjected to the Accelerated Aging Test, Section 21 and the Fuel Gas Compatibility Test, Section 22. Exception: Chlorotrifluoroethylene polymers, tetrafluoroethylene, fluorinated ethylene propylene polymers and polyamides of composition polyhexamethylene adipamide or polycaproamide polymers (nylon 6 or 6/6) are acceptable without test. 7.3 If atmospheric corrosion of a ferrous part will impair the intended operation of a torch, the part shall be provided with a corrosion-resistant protective coating. 7.4 A protective coating shall resist corrosion to the degree not less than that provided by the protective coatings specified in 7.5. 7.5 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: If threads constitute the major portion of the area of a part, the thickness of the cadmium or zinc plating may be not less than 0.0001 5 inch (0.0038 mm).