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3.1.4. If the tank is a water/wastewater tank equipped for optional preinstallation testing, after inspecting the tank (see section 3.2), follow procedures in the Preinstallation Testing Instructions for Water/WastewaterTanks Factory -Equipped for Pressure Testing. See the Introduction for information on how to obtain this supplement 3.1.5. If damage of any kind is detected, contact the manufacturing facility that shipped the tank before installing the tank. NOTE: Do not attempt unauthorized repairs. 3.2. INSPECTING THE TANK 3.2.1. Thoroughly inspect the entire outside surface of the tank for signs of shipping or handling damage. Rotate or lift the tank to inspect the bottom of the tank. 3.2.2. If damage of any kind is detected, contact the manufacturing facility that shipped the tank before installing the tank. NOTE: Do not attempt unauthorized repairs. 4: TESTING DURING INSTALLATION 4.1. TANK TYPES 4.1.1. Typically, all underground storage tanks need to be tested in the field to confirm that there are no problems with the tank. We recommend the pressure test on any tank that can be safely sealed for testing. Tanks that cannot be sealed, including those with large access openings or with pipe nozzles, may be tested hydrostatically if required. 4.1.2. We recommend that the following tanks we manufacture are pressure tested during installation: • fuel tanks • DEF tanks • chemical tanks • potable watertanks • oil/water separators • pipeline sump tanks 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 not equipped for pressure testing may require hydrostatic testing. They include the following: • watertanks • wastewatertanks 4.2. PRESSURE -TEST PRETESTING PROCEDURES NOTICE Do not install any piping orfittings otherthan testfittings until all preinstallation testing has been completed. Failure to follow this notice could result in property damage. NOTICE Never pressurize a wet interstitial space. Doing so could result in damage to the primary tank and/ortank failure. 4.2.1. Someone must be with the tank at all times during pressure testing 4.2.2. Prior to the pressure test, remove all plugs, apply sealant, and replace and tighten plugs. Tel A WARNING Before beginning the pressure test, notify all people on the test site to remain in a safe location. NEVER LEAVE ATANK UNDER PRESSURE UNATTENDED. Stand clear of manways, fittings and tank ends during the test. When the tank is under pressure, the manways, access openings and/or fittings may dislodge, or the tank could rupture, and this could result in death or serious injury. 4.2.3. If the tank being installed is not a pressure -testable tank, proceed to section 5. 4.3. PREPARING THE TANK FOR PRESSURE TESTING 4.3.1. The pressure test pressure for 4 -foot -diameter through 10 -foot -diameter tanks is 5 psig [35 kPa], and 3 psig [21 kPa] for 12 -foot -diameter tanks. A WARNING Do not overpressurize the tank. Position the pressure gauges so that the pressure readings can be clearly read at all times. The pressure 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 this warning could result in death or serious injury. 4.3.2. The tester is responsible forverifying that all of the test equipment is in good working condition, and is properly configured and calibrated. 4.3.3. Construct a test manifold with two pressure gauges as shown in Figure 4.1. Each pressure gauge must have a maximum full-scale reading of 15 psig 1100 kPa] with graduations in 1/2 psig [2.5 kPa] increments, and a pressure -relief valve set at 6 psig [40 kPa] (4 psig for 12 -foot -diameter tanks). 4.3.4. Take particular care to note the following: • An interstitial test manifold is needed for testing the dry interstitial space of a pressure -testable double-wall tank. See Figure 4-2. • A test manifold is not required for testing a tank interstice filled with monitoring fluid. • All compartments of a multicompartment tank may be tested simultaneously, or each compartment may be tested separately. • When pressure testing multicompartment tanks, a test manifold is needed for each compartment.