UL 147-2021 pdf free download.Hand-Held Torches For Fuel Gases.
5.7 A brazing material used for joining liquid-confining parts of a torch shall have a melting point (solidus temperature) not less than 1000°F (538CC).
5.8 A torch unit with integral fuel container shall be equipped with pressure relief device(s) or system(s). or be constructed so that the torch will not rupture or be violently propelled when exposed to a fire condition, See the Fire Test on Torch Units with Integral Containers, Section 17.
5.9 Torches that incorporate a hose assembly shall have the following components and they shall be evaluated to the appropriate UL standard:
a) LP-gas hose assembly — Standard for LP-Gas Hose, UL 21 or the Standard for Pigtails and Flexible Hose Connectors for LP-Gas, UL 569;
b) Compressed gas regulator or LP-Gas regulator — Standard for Compressed Gas Regulators, UL 252 or Standard for Pressure Regulating Valves for LP-Gas, UL 144;
c) Regulator accessories (if provided) — Standard for Compressed Gas Regulator Accessories. UL 252A; and
d) Excess Flow Valve — Standard for Valves for Anhydrous Ammonia and LP-Gas (Other Than Safety Relief), UL 125.
Exception: If the manufacturer does not provide any of the above components the safety instructions shall stale that the torches are for use only with UL Listed regulator, compressed gas regulator (for use with LPGas), and/or excess flow check valve as applicable.
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 t).pe of inlet connection need not comply with this requirement if the torch unit is marked in accordance with and the operating instructions include directions for leak free connection to the specif 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: 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.UL 147 pdf download.