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3.1.4. If the tank is a water/wastewater tank equipped for optional A WARNING preinstallation testing,after inspecting the tank(see section 3.2), Before beginning the pressure test,notify all people on the test follow procedures in the Preinstallation Testing Instructions for site to remain in a safe location.NEVER LEAVE ATANK UNDER Water/WastewaterTanks Factory-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 3.2.1.Thoroughly inspect the entire outside surface of the tank for PRESSURE TESTING signs of shipping or handling damage.Rotate or lift the tank to inspect 4.3.1.The pressure test pressure for 4-foot-diameter through the bottom of the tank. 10-foot-diameter tanks is 5 psig[35 kPa],and 3 psig[21 kPa]for 3.2.2.If damage of any kind is detected,contact the 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-di a meter 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 in Figure 4.1.Each pressure gauge must have a maximum full-scale the pressure teston anytank thatcan be safely sealed for testing.Tanks that reading of 15 psig[100 kPa]with graduations in 1/2 psig[2.5 kPa] cannot be sealed,including those with large access openings or with pipe increments,and a pressure-relief valve set at 6 psig[40 kPa](4 psig nozzles,may be tested hydrostatically if required. for 12-foot-diameter tanks). 4.1.2.We recommend that the following tanks we manufacture Figure 4-1 are pressure tested during installation: • fuel tanks • DEF tanks 4 Pressure Supply • chemical tanks • potable watertanks • oil/water separators • pipeline sump tanks Pressure-Supply Valve 4.1.3.All UL-label,ULC-label and potable water tanks must be pressure tested after backfill is brought close to the top of the tank. 4.1.4.Tanks that cannot be sealed and are note ui ed for Pressure q pp p ressure Gauge testing may require hydrostatic testing.They include the following: Pressure • watertanks Gauge • wastewatertanks 4.2.PRESSURE-TEST PRETESTING PROCEDURES Pressure-Relief NOTICE Device Do not install any piping or fittings other than testfittings 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 • A test manifold is not required for testing a tank interstice filled result in damage to the primary tank and/ortank failure. with monitoring fluid. • All compartments of a multicompartment tank may be tested 4.2.1.Someone must be with 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 multicompartment tanks,a test manifold and replace and tighten plugs, is needed for each compartment. 16