UL 791:2006 pdf download – Residential Incinerators.
38.3 When an incinerator is tested in accordance with these requirements, no part shall attain a temperature sufficient to damage required corrosion potechon, to adversely affect operation of safety controls, to impair the value of me required thermal or electrical insulation, nor to cause creeping, distortion, sa9ging, or similar damage when such damage to the material or part may cause the incinerator to become unsafe for use. The temperature rises at specific points shall be not greater than those specified in Table 91 unless otherwise indicated.
39 Test Installation Enclosure, Flue Pipe, and Chimney
39.1 An incinerator is to be placed in a partial enclosure, as illustrated by Figures 38.1 and 38.2. so that the distance from one side of the incinerator to the wall and from the back of the incinerator to the wall opposite the rear of the incinerator is to be as specified by the manufacturer but not more than 12 inches (305 mm) or less than 3 inches (76.2 mm). When one side of an incinerator may create higher wall temperatures than the other, the hotter side of the Incinerator is to be located directly opposite the one wall. Any adjustable damper included En the assembly of the incinerator is to be placed in the position allowing maximum temperature conditions.
39.2 The walls of the test enclosure are to be made of 1 inch (25.4 mm), (nominal thickness), tongue-and-groove boards or 3/4 inch (19.1 mm) thick plywood. Surfaces of the walls are to be painted a flat black. The floor is to be made of 1 inch (25.4 mm) soft-wood flooring covered with one thickness of building paper over which is then laid 1 inch (25.4 mm) tongue-and-grove oak flooring finished with clear varnish. All jolnts in the walls and floors are to be sufficiently tight or sealed to prevent air passage through them.
39.3 The incinerator is to be leveled. Any detachable leveling means are to be removed. Any nondetachable leveling means are to be adjusted to place the base of the incinerator the minimum distance obtainable above the floor.
39.4 Unless a clear space, as described in 6.10. is provided, the bottom of an incinerator above a combustible floor Is to be considered as having zero clearance to the floor or to combustibles accumulating beneath the incinerator.
395 The incinerator is to be connected to an insulated pipe chimney as illustrated in Figure 38.2. The diameter of the flue pipe connection between the incinerator arid the base of the chimney is to be the same as provided for by the flue collar. The chimney is to have an internal diameter of 8 inches (203 mm). The flue pipe and chimney are to be encased in a high-temperature insulating material at least 1 Inch (25 mm) thick, The height of the chimney, item H, Figure 38.2 is to be as indicated in Table 39.1.
43.3 The charge is to be ignited, and temperatures are to be observed and recorded until equilibrium or receding temperatures are attained.
43.4 The maximum temperature rise on walls opposite the incinerator casing and on the floor under and within 3 feet (0.9 m) of an incinerator that is to be acceptable for installation on combustible floors, in flue gases. and on incinerator parts shall not exceed the values indicated for such items by Table 9.1 when the incinerator is tested as outlined in 41.1 —41.3, 43.1 — 43.3, and in 441.
43.5 The limitations on the rise in flue-gas temperature are intended as an indirect determination of and limitation on the surface temperatures of combustible walls adjacent to the vent pipe or flue connectors,
44 Continuous Charge Test
44.1 A charge of shredded newspaper proportioned on the basis of 1 pound per bushel (0.45 kg per
0.035 m3) of rated incinerator capacity is to be introduced into the incineration chamber at 8-minute intervals. Each charge is to be separated to occupy the approximate volume specified before being introduced into the chamber. Temperatures are to be recorded at the start of the seventh successive charge, and intermittent loading is to continue until equilibrium or receding temperatures are recorded, but at least eleven charges are to be consumed during the test.
44.2 The maximum temperature rises shall be in accordance with the requirements of 43.4.
45 Power Input Test
45.1 The power input to an incinerator shall be not more than 110 percent of Its marked rating when connected to a supply circuit having a potential as indicated below.