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DEC TESTING PROCEDURES
<br /> STAGE 11 VAPOR RECOVERY
<br /> 9 Repeat steps I through 8 for each dispenser/vapor return piping inlet tc�
<br /> be tested.
<br /> PRESSURE DROP DURING FLQH I'M PROCEDURE BLOCKAGE TEST PROCEDURE FOR BALANCE 10. If liquid blockage is indicated , make necessary repairs or adjustments to
<br /> STAGE 11 BALANCE SYSTEM INSTALLATIONS STAGE 11 INSTALLATIONS the tested piping to eliminate the blockage.
<br /> ll , After completion of blockagq testing , close and cap the tank vapor dry
<br /> This procedure describe: the method for determining the pressure drop through This procedure describes blockage testing of underground vapor recovery piping break valves .
<br /> balance Stage 11 vapor recovery systems at various flow rates, of Stago 11 vapor recovery systems ,
<br /> 1 . The "wet test" back pressure reading must not exceed 0.03 w.c .g, higher
<br /> Underground vapor recovery p1ping conducts vapors to the underground tank. Underground vapor recovery piping provides the path by which vapors collected than the "dry test" back pressure reading ,
<br /> This procedure is used to determine the pressure drop through balance Stage 11 during vehicle refueling are transferred to the underground gasoline storage
<br /> vapor recovery systems ( including nozzle, vapor hose, swivels , dispenser tanks . This test procedure is to be used to detect low points in the piping 2. The pressure drop of the vapor collection and return piping system must
<br /> piping and underground piping) at prescribed flow rates . This procedure will where accumulation of liquid may cause blockages and thus restrict the Flow of not exceed 0.45 inches of water at a nitrogen flow of 60 CFH at 2.5 p� s , i ,
<br /> allow contractors to ensure that balance Stage 11 vapor recovery systems have vapors , This procedure will allow contractors to check for blockage of
<br /> been installed in accordance so the following pressure drops will not be underground vapor piping b.Q
<br /> -tJ1 before and after the lines have been covered ,
<br /> exceeded . The test must be performed and , potential blockages must not occur after all
<br /> a) 0,45 Inches of water at a flow of 60 CH vapor piping is In place and covered,
<br /> The method consists of attempting to create a blockage by introducing gasoline
<br /> b) 0, 95 inches of water at a flow of 100 CFH into the vapor piping at the dispenser, Hhen enough gasoline has been
<br /> introduced into the vapor piping to create a blockage should a low point be
<br /> We method consists of flowing gaseous nitrogen through a calibrated test present , at very low pressure is forced Into the vapor TABLE 1
<br /> panel and Into the vapor recovery system noted above at specIfie" flow rates piping, If sufficient resistance to flow is measured, then It can be
<br /> Wle recording the resulting back pressures measured near the no'zzle concluded there is an unacceptable low point in the piping which may cause
<br /> faceplate, blockage of the vapor return path. This method may also be used to test low
<br /> point drains , and condensate traps ,
<br /> The following equipment will be needed to perform this test: 5 7 10 20 40 60 80 Too GALSKI",
<br /> The following equipment will be needed to perform this test:
<br /> 1 . A bottle of compressed nitrogen with pressure regulator(s) Wablf
<br /> Pe o 2" Schedule 40
<br /> regulating final downstream pressure to 5 pounds per square i"0 ch gauge I . The bottle of compressed nitrogen with pressure regulator(s) capable of Hrought Steel Pipe, 2 4 7 11 14 18 0. 174T
<br /> regulati ng' fl nal downstream pressure
<br /> to 5 pounds per square inch gauge
<br /> (psi g) . 2" Fiberglass 2 4 8 12 16 20 0, 199
<br /> 2 , A device similar to that shown in attached Figure I capable of delivering
<br /> measured flow rates of 60 and 100 cubic feet per hour (CFH) , 1 2. A device capable of delivering nitrogen at very iow pressures and at a 3" Schedule 40
<br /> 3. The above device shall be capable of interfacing with the Stale Il balance measured flow rate of 60 cubic feet per hdu r (CFH) . Hrought Steel Pipe 4 8 16 23 31 39 0. 384
<br /> system, making a tight seal with the nozzle faceplate. This Can be 3, A pressure gauge capable of accurately measuring pressures from 0 to 1 3" Fiberglass 5 10 19 23 37 46 W455
<br /> AcuTplished using a modified vehicle fIllpipe in the devicK�1, inch of water column gauge Qw,c ,g. ) and readable In increments of 0.011,
<br /> 4 . A pressure gauge capable of accurately measuring pressures fr 11 hi 0 to I w.c .g. The gauge i s used to measure vapor recovery piping back pressure
<br /> before and after gasoline Is Introduced and Should sense pressure as close
<br /> inch of water column gauge ("w.c .y , ) and readable In incrcments of 0,01 as possible to the entrance of the vapor piRing, An additional
<br /> w. c .y, the gauge Is used to measure the entire balance syst6T pressure simultaneous-reading gauge with a 0 to 10" `&,cg, range Is useful to
<br /> drop. Pressure Is to be sensed through a port, perpendicula( to the quantify excessive flow resistance.
<br /> direction of flow, located as close as possible to the vapgr°,Jecovery
<br /> nozzle faceplate. An additional simultaneous-reading gauqe,,1",'4Ith a 0 to
<br /> 10" w,c ,y , range is useful to quantify excessive flow resist ''eco.
<br /> I E 5 1 PANEL
<br /> d,
<br /> 1 . Provide a grounding path from the nitrogen bottle regr
<br /> ulato ' a good 4. A device capable of coupling the devices s 6 C f 10 d in #2 and #3 above to
<br /> earth ground, the vapor return piping at the dispenser,
<br /> F0 balance Stage 11 vapor
<br /> recovery systoms the test panel described in fig, I may be used without
<br /> 2 . ''Prop open only the vapor dry break valve at the tank with 0 Same modification if the gaseous nitrogen is flowed through the vapor recovery
<br /> nozzle and hose into the vapor recovery pipih�
<br /> product at the test nozzle. Set up traffic barriers in the q I- If nitrogen is passed
<br /> vicinity of directly into the vapor piping, the test Panel must be either modified to X r)-5 PSI
<br /> the dry break valves to preclude the approach of potential i bypass the modified f i I I neck or, preferably, 4 balance system nozzle can
<br /> sources , AlI tank vent pipes shall be temporarily closed of(duri ng this be used as an interface between the test panel and vapor piping. MUNN:
<br /> test, '' counted/
<br /> it 7
<br /> Q
<br /> 3, A pressure reliet safety vent valve set at one pound per SqUa p inch (27,7 CAGE
<br /> 1 0-10 P0
<br /> or less shall be Installed in each separate vent sy$em closure, 1 , Provide agrounding path from the nitrogen bottle regulator to agood
<br /> 4. Insert the balance nozzle to be tested into the fill pipe Sim 11 lator of the earth ground.
<br /> pressure drop test device, A I ight film of a lubricant shouH be applied 2 . Connect the test device to vapor return piping and the regulated ni trogen Q--to" �v F��c S U k':7
<br /> to the nozzle faceplate in order to ensure a seal . source. Ensure that all other vapor p1 ;Arq inlets are capped or that (;AGf;
<br /> nozzles with tightly closed vapor passages are in place.
<br /> Prop open the P 4 A I�4 r L 0 v1,1 n t 0,0 k"
<br /> 5. ''Adjust pressure regulators and the pressure drop panel flu, �c o n t r a I tank vapor dry break valves . Set up traffic barriers in the vicinity of VA U V r room
<br /> valve to produce a nitrogen flow rate of 20 CFH. Record the ick pressure
<br /> the vapor dry break valves to preclude the approach of potential ignition
<br /> (balance system pressure drop) measured at the entrance to the
<br /> nozzle. " sources .
<br /> 6o ''Repeat step #5 with flow rates of 60 CFH and 100 CFH. Reco"d the back 3, Zero pressure gauges , Figure t
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