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Recomrner4ed Practices for the Tm1inq and Verilieation of Spill.Overflll,lr�-ak N%t?rft And Sare>'pory cnnrainmonr Erluipms!nI at UST raciliues <br /> interstitial spate is raised awid is manitored for a apccl- 4.2 tank Secondary Containment Integrity Testing <br /> tied ferind of time to deterrnine il' the r~oniainment has — Dry Test Method <br /> i rr t�� ri Ly. <br /> 4.2.1 Purpose. This method is used to test the <br /> A [auk sec:=diuy cenlaia=nt itltcgety test does not integrity of the day secondary cuataiun ml of a <br /> r=exgarity deterenine whether rite primary tank is tight UST. <br /> bixause portions of the primay tail, such as tank fiEingS <br /> andmaaway tapcni>!tls, may ztraE bL: incirtiCecl in rite CCrr1- �.�.� Description of Test. A It�irtiaC vacuum is <br /> ralnmem imegrity test, drawn cn the interstitial space and it is monitored <br /> for a spceified period of ti=.If die vacuum level is <br /> maintained,the conlxinrnent system has passer! the <br /> Tie vacuum tefit time dclx:nds on the volume <br /> y' of rite annular apace and site conditions. <br /> 4.2.3 Test Conditions. The primary tank may <br /> contain any level of product. No bulk deflycricts <br /> sitbll omur during dlie Mgt, <br /> CAUTION: Use Only an ear-operated vacu- <br /> um acurce or a vacuum pump powered by <br /> an explosion-prow# muter. Vacuum primps <br /> F with electric motors that are not expko- <br /> s. slowproof may Ignite flammable vapors. <br /> It a portable aIr compressor is usad, it <br /> should be located at Least 20 feet sway <br /> from the ventuvi-edetctor or outside any <br /> Blass 1, Ialwle€on t area. <br /> FIGURE 4A.A cutaway view of a dcubfe-wafted tank. <br /> Plurnbar's <br /> r}Ir� <br /> Vacuum Au°,omalle Vacuum Control n-W rig <br /> 811LIMA 5humff Valwo Vetvo Vacuum Gauge <br /> Tank <br /> FIGURE 4-2. Schernatfc of the dry test method apparalus. <br /> peE.cCg <br />