UL 147:2015 pdf download – HAND-HELD TORCHES FOR FUEL GASES.
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 950F (510CC) and a tensile strength of not less than 10,000 psi (68.9 MPa) at 4O0F (204CC).
Exception No. 1: A valve disc, soft seat. seal irng, 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.
7.10 revised March 5.2015
7.11 Polymeric materials used for gas confining housings and caps for butane torches with integral
container assemblies shall exhit flammability characteristics in accordance with the Standard for Test for
Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94. flammability classification
V-0. V-I. or V-2.
8 General
8.1 Representative samples of each size and specific construction of torch are to be subjected to the tests specified in Sections 9 — 22. The number of samples required for tests are specified in Table 8.1. Additional samples of parts constructed of nonmetallic materials, such as gaskets and other seal materials, are required for physical and chemical tests.
8.2 If a torch is intended for operation on more than one fuel gas, the various performance tests described herein are to be conducted with all fuels and with any orificeluel combination possible, whether or not such combination is recommended by the manufacturer. The efficiency of the torch combinations is not to be considered during the tests. The torch units shall not create a risk of fire or injury to persons when tested in such combinations.
9 FillIng Procedure Test
9.1 The risk of fire or injury to persons shall not be created dunng the tilling sequence. it is recognized that some fuel will be released during the filling process.
9.2 Three representative samples of a torch unit incorporating a refillable integral container are to be used. Following the manufacturers instructions, the units are to be filled using recommended and similar commercially available fuel containers. Following this test, the samples are to be subjected to the Pressure Test, Section 10.
10 Pressure Test
10_i Representative samples of the torch unit with integral container assembly fully charged is to be subjected to a water bath maintained at 13OF (54.4CC) until maximum pressure is established. No external leakage shall be observed. The test is to be conducted until the pressure has stabilized,
10.2 This test is to be conducted on three samples of a torch unit containing an integral container assembly and on the same samples subjected to the Filling Procedure Test, Section 9. Means shall be provided on the samples for the measurement of pressure.
10.3 During this test the burner shutoff vaNe is to be in the closed position.
11 Leakage Test
11_i A torch unit is to be subjected for one minute to an internal aerostatic pressure of not less than 1-1/2 times the service pressure specified in Service Pressure Ratings, Section 4. There shall be no observable leakage.
11.2 This test is to be conducted on three samples of each torch unit design. For torch units incorporating an integral container assembly, the container portion is to be provided with a fitting for connection to a source of aerostahc pressure. The samples are to be tested with the shutoff valve in a closed position so that seat leakage, as well as external leakage, can be checked.