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3.1.4.If the tank is a waterlwastewatertankequipped for optional A WARNING preinstallation testing,after Inspecting the tank(see section3.2), Before beginning the pressuretest,notifyall peopleonthetest follow procedures in the Preinstallation Testing lnstructionsfor siteto remain in asafe location.NEVER LEAVE A TANK UNDER WaterlWastewaterTanksFactory-Equipped for Pressure Testing. PRESSURE UNATTENDED.Stand clear of manways,fittings and See the Introduction for information on how to obtain this supplement. tank ends during the test.When the tank is under pressure,the 3.1.5. If damage of any kind is detected,contact the manufacturing manways,access openings and/or fittings may dislodge,or the facility that shipped the tank before installing the tank. tank could rupture,and this could result in death or serious injury. NOTE:Do not attempt unauthorized repairs. 4.2.3. If the tank being installed is not a pressure-testable tank, proceed to section 5. 3.2.INSPECTING THE TANK 4.3.PREPARING THE TANK FOR 3.2.I.Thoroughly inspect the entire outsidesurfaceofthetankfor PRESSURETESTING signs of shipping or handling damage.Rotate or lift the tank to inspect the bottom of the tank. 4.3.1.The pressure test pressure for 4-foot-diameterthrough 10-foot-diameter tanks is 5 prig[35 kPa],and 3 psig[21 kPa]for 3.2.2. If damage of any kind is detected,contactthe manufacturing 12-foot-diameter tanks. facility that shipped the tank before installing the tank. A WARNING NOTE: Do not attempt unauthorized repairs. Do not overpressurize the tank.Position the pressure gauges so that the pressure readings can be clearly read at all times.The pressure 4• TESTING DURING gauge must have a pressure-relief valve that is used and set at 6 psig [40 kPa](4 psig[28 kPa]for 12-foot-diameter tanks).Failure to follow INSTALLATION this warning could result in death or serious injury. 4.3.2.The tester is responsible for verifying that all of the test equipment 4.1.TANK TYPES is in good working condition,and is properly configured and calibrated. 4.1.1.Typically,all underground storage tanks need to be tested in the 4.3.3.Construct a test manifold with two pressure gauges as shown field to confirm that there are no problems with the tank.We recommend inFigure4.1.Each pressuregaugemusthaveamaximum full-scale the pressure test on any tank that can be safely sealed for testing.Tanks that reading of 15psig[100kPa]withgraduationsin1hpsig[2.5kPa] cannot be sealed,including those with large access openings orwith pipe increments,andapressure-relief valve set at 6 psig[40 kPa](4psig nozzles,maybe tested hydrostatically if required. for 12-foot-diameter tanks). 4.1.2.We recommend that the following tanks we manufacture are pressure tested during installation: • fuel tanks • DEE tanks Pressure Supply • chemical tanks • potable water tanks • oil/water separators • pipeline sump tanks 4.1.3.All UL-label,ULC-Iabeland potable water tanks must be pressure Pressure-Supply Valve tested after backfill is brought close to the top of the tank. 4.1.4.Tanks that cannot be sealed and are not equipped for pressure Pressure testingmay require drostatictestin .The Include the Gauge Y q Y testing.They 9 Pressure • watertanks Gauge • wastewatertanks 4.2.PRESSURE TEST PRETESTING PROCEDURES Pressure-Relief NOTICE Device Do not install any piping or fittings other than test fittings until all preinstallation testing has been completed.Failure to follow 4.3.4.Take particular care to note the following: this notice could result in property damage. • An interstitial test manifold is needed for testing the dry interstitial NOTICE space of a pressure-testable double-wall tank.See Figure 4-2. Never pressurize a wet interstitial space.Doing so could • Atest manifold is not required for testing a tank interstice filled result in damage to the primary tank and/or tank failure. with monitoring fluid. • All compartments of a multicompartment tank may be tested 4.2.I.Someone must bewith the tank atall times during pressure testing. simultaneously,or each compartment may be tested separately. 4.2.2.Prior to the pressure test,remove all plugs,apply sealant, • When pressure testing muldcompartment tanks,a test manifold and replace and tighten plugs. is needed for each compartment. 16 3:PREINSTALLATION INSPECTION AND TESTING/4:TESTING DURING INSTALLATION