UL 842-2015 pdf download

UL 842-2015 pdf download.Valves for Flammable Fluids.
16.2 Prior to the fire test the valve is to be manually operated 100 times from fully opened to fully closedwith normal closing pressures exerted on the valve seat.
16.3 The valve is then to be mounted and connected into a piping system, that utilizes the same size pipecouplings as the sample valve, and will place the valve inlet approximately 4 inches (102 mm) above thesurface of the kerosene that will be burned during the test.The kerosene is to be contained by a panapproximately 21 inches (533 mm) in diameter and 2-1/2 inches (63.5 mm) deep.
16.4 A means for adding kerosene to the pan during the test is to be provided,consisting of a smallremotely located container, a manual shutoff valve, and a supply line to provide for gravity feed of theliquid to be added to the pan.
16.5 A manual shutoff valve and a means for relief are to be provided in the fluid line serving the testvalve.The system of piping is to be such that the maximum pressure of fluid for which the valve is ratedcan be impressed on the inlet to the vave immediately after the test valve has closed during the fire test.The test valve outlet is to be arranged to discharge any leakage to the pan.
16.6 At the start of the test, the test valve is to be open. When the valve is for liquid shutoff service, thesupply line and the valve are to be filled with the test liquid. This shall be accomplished by providing atrapped outlet on the discharge side of the valve.The manual shutoff valve is to remain closed until thefusible link has operated.
16.7 A valve intended for use with gasoline,kerosene,and heavier fuel oils,or with fuel gas, is to besubjected to the burning of kerosene.The test fluid in the test valve and its supply line is to be kerosenefor liquid handling valves, and natural gas for gas handling valves.An initial charge of 1 gallon (3.8 L) ofkerosene to which 30 cubic centimeters of “white”gasoline has been added is to be placed in the pan.After ignition and immediately following the rupture of the fusible element,the manual valve and themeans for relief are to be manipulated to maintain the rated or minimum test pressure, whichever is thegreater, of the test valve in the supply line.The minimum test pressure is to be:
a) 10 feet (3.05 m) of liquid head for a valve intended for kerosene or fuel oil orb) 9 inches (229 mm) water column for a valve intended for fuel gas.
16.8 At 10 minutes and again 20 minutes after ignition, an additional gallon (3.8 L) of kerosene is to beadded to the fire in the pan. Forty-five minutes after ignition, the kerosene originally in the pan, addedcharges of kerosene,and any liquid added thereto as the result of seat or external leakage are to becompletely burned out. lt is anticipated that any leakage of liquid will be accumulated in the pan. With thepan dry of liquid, small flames issuing from the valve or its outlet after the 45 minute burnout period arenot to be considered as contributing to an external fire.
17 Weak Section Strength Test
17.1 An emergency shutoff valve for flammable liquids intended for installation at the supply connectionof a dispensing device shall close when a bending moment of not more than 650 pound-feet(884 N-m)is applied to its assembly.
17.2 The valve is to be anchored immediately adjacent to the valve inlet connection using a full-size pipe,flange, or support as intended for this opening.A full-size pipe extension, sufficiently long to provide thebending moment required to operate the valve is to be secured to the outlet connection of the valve.17.3 Following operation as the result of the required applied bending moment, the valve shall complywith the requirements of the tests for external and seat leakage. See Section 13 and Section 14.
18 Endurance Test
18.1 A manually operated valve shall perform in its intended manner when tested as described in 18.3一18.14.There shall be no external leakage, no sticking of the valve, nor shall the valve become inoperative.Required corrosion protection shall not be impaired.