UL-147:2015 pdf free 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-i.
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 510, CGA 791, or CGA 810
(Type I or Type II) outlet connection complying with the Standard for Compressed Gas Cylinder Valve
Outlet and Inlet Connections, ANSI/CGA V-i.
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: Chiorotrifluoroethylene polymers, tetrafluoro ethylene, 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 (0.013 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 0.000 15 inch (0.0038 mm).
7.6 A fuel-confining part of a burner that is made of drawn brass or machined from brass rod made of copper alloy containing more than 15 percent zinc and incorporating internal threads shall withstand without cracking, the Moist Ammonia-Air Stress Cracking Test, Section 20.
7.6 revised March 5, 2015
7.7 Parts made of metals having widely varying coefficients of thermal expansion and exposed to heat shall not be used in combination if threaded together with the intent to reduce the likelihood of external leakage of fuel.
7.8 Copper or brass tubing and fittings containing more than 67-percent copper shall not be used for parts in contact with MPS-Gas.
7.9 An operating or gas-confining part of a torch unit shall have sufficient strength and durability to provide reliable service of the part and of the assembly.
7.10 To conform to the requirements of 7.9, a gas-confining material is to have a melting point (solidus temperature) of not less than 950°F (51 0°C) and a tensile strength of not less than 10,000 psi (68.9 MPa) at 400°F (204°C).
Exception No. 1: A valve disc, soft seat, seal ring, diaphragm, or gasket need not comply with this requirement.
Exception No. 2: A torch unit for butane incorporating an integral container assembly complying with 5.2 and subjected to the Hydrostatic Pressure Strength Test, Section 18, and the Sustained Pressure Test, Section 19 need not comply with this requirement.