ASME A112.18.8:2020 pdf download

ASME A112.18.8:2020 pdf download.Sanitary Waste Valves for Plumbing Drainage Systems
1 GENERAL
1.1 Scope This Standard establishes minimum requirements for materials in the construction of a sanitary waste valve (here- inafter referred to as “the valve”) for use as an alternate to a tubular p-trap. This Standard prescribes minimum test requirements for the performance ofthe valve together with methods ofmarking and identification. This Standard does not define the requirements for products to be used in urinals or water closets. It is not intended that products meeting this Standard will be used in a urinal or water closet. The provisions ofthis Standard are notintendedto preventthe use ofanyalternate material ormethodofconstruction provided any such alternate meets the intent of this Standard. 1.2 Units of Measurement Values arestatedinU.S. Customaryunits andinthe InternationalSystemofUnits (SI). TheU.S. Customaryunits shallbe considered as the standard. InthisStandard,gallons(U.S.liquid) perminuteisabbreviatedgpm,andliters(metricliquid) perminuteisabbreviated L/min.
2 GENERAL REQUIREMENTS
2.1 Material The valve shall meet the material requirements ofASTM F409. The valve shall be installed in an accessible location. 2.2 Seal Material Seal materials shall comply with or exceed classification M3BA507 A14 B13 C12 F17 or M2BG714 B14 EO14 EO34 of ASTM D2000. 2.3 Bladder/Checking Member Material Bladder/checking member material shall comply with or exceed classification M3FC607 EA14 EO16 G11 of ASTM D2000. 2.4 Valve Inlet 2.4.1 The valve inlets shall be 1 1 ∕ 4 in. (31.8 mm) or1 1 ∕ 2 in. (38.1 mm) nominal straightor with an 87 1 ∕ 2 -degelbowor be standard pipe size straight inlets (see Figure 2.4.1-1). 2.4.2 The base ofthe thread may be sealed by a sealing washer (inlet set) at the base ofthe thread. The useful thread length shall be between 3 ∕ 8 in. (9.5 mm) and 1 ∕ 2 in. (12.7 mm). All threaded fixture outlets shall have a minimum three- thread engagement for fittings and plastic nuts to correctly engage and energize the inlet seal in accordance with ASTM F409.
2.4.4Ifrequired,astraight-runningadaptershallbeavailable to allowthevalveto be connectedto the piperatherthan the fixture outlet. 2.5 Valve Outlet The valve outlet shall have a connection that is compatible with tubing or pipe complying with ASTM F409, ASTM D2661, or ASTM D2665 or threaded connections complying with ASME A112.18.2/CSA B125.2. 2.6 Threaded Connections All threads that connect to external fixtures shall comply with ASME B1.20.1.
3 TESTING
3.1 Waterway Flow Rate 3.1.1 Test Method. Connect the valve to the waste outlet hole ofthe tank in accordance with Figure 3.1.1-1 and the manufacturer’s installation instructions. Fill the test tank with water up to the test level. Stabilize the test level by adjusting the water inflow by means of the regulating valve. When the test water level is stabilized, the flow rate of the valve is indicated by the flowmeter.3.2 One-Way Sealing Performance of the Valve 3.2.1 Test Apparatus. The test apparatus is as follows: (a) length of 1 ∕ 4 in. (6 mm) bore rubber tubing (b) tee-junction suitable for use with the rubber tubing (c) u-tube manometer with a range of 0 in. (0 mm) to 6 in. (152 mm) of water, gage (d) reducer to enable the rubber tube to be connected to the outlet of the valve 3.2.2 TestMethod. Prime the valve byrunningagallonofwaterthroughthe valve to waste. Connecttherubbertubing through the reducer to the outlet ofthe valve. Connect the other end ofthe tube to the tee-junction, one leg ofwhich is connectedtotheu-tubemanometerandtheremaininglegtoanotherlengthoftubing. Applyairpressuretothefreeendof the tubing until a pressure of4 in. (102 mm) ofwater, gage, is registered on the u-tube manometer. Clamp the end of the tubeandmaintainpressure for 20 sec.then retest under the same conditions but omit the water priming stage. 3.2.3 Performance Requirements. The valve shall retain a seal undera backpressure, equivalentto 4 in. (102 mm) of water, gage, for 20 sec on both the initial test (with valve primed) and the retest.