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5.5.1.5.Contamination can be avoided by doing one of the following: NOTICE • ballast the tank with a liquid compatible with the product being All internal piping must be at least 4 inches[10 cm]from stored OR the tank bottom.Failure to follow this notice could result • clean the tank after ballasting to eliminate any contaminating product in damage to the tank and/or surrounding property. A WARNING NOTICE Inert the tank and use inert gases(not air)to pressure test All metal fittings and other metal components must be coated a tank that contains or has contained flammable or combustible to protect against corrosion.Failure to do this could result in liquids or vapors.Failure to follow this warning could result damage to these parts,the tank and/or surrounding property. in an explosion,and could result in death or serious injury. 7.1.2.For tanks equipped with manways,see table and relevant figure A WARNING in Piping Sidebarto determine the correct length for internal piping. If flammable or combustible productis used as ballast,exercise 7.1.3.For tanks equipped with access openings,see table special care in handling.Safeguard against sparks,fire or product and relevant figure in Piping Sidebar to determine the correct spills.Failure to follow this warning could result in a fire or an length for internal piping. explosion,and could result in death or serious injury. 7.2.EXTERNAL PIPING 6: POSTINSTALLATION TESTING A WARNING The tank must be isolated from all piping when the external 6.1.PRESSURE TESTING TANKS piping is being pressure tested.The test pressures for external piping could cause tank failure,and could result in death 6.1.1.If the tank is a water/wastewater tank equipped for pressure or serious injury. testing,follow the procedures in the Preinstallation Testing Instructions for Water/Wastewater Tanks Factory-Equipped for Pressure Testing 7.2.1.When extending monitoring or vapor-recovery piping to the surface,make sure the at-grade fittings are different from supplement.See the Introduction for information on how to obtain any fill fittings and will not accept standard fill hoses. this supplement. 6.1.2.All UL-label,ULC-label and potable watertanks must be NOTICE pressure tested after backfill is brought close to the top of the tank. All connections to the tank must be flexible.Provisions must be made to accommodate movement and misalignment between 6.1.3.If the tank is ballasted with water,the tank can be pressurized the piping and the tank.Failure to do this could result in damage for pressure testing.See Pressure-Testing Sidebar. to the tank and/or surrounding property. 6.2.OPTIONAL HYDROSTATIC TESTING 7.3.VENTING TANKS 6.2.1.This optional test is typically used for water or wastewater A WARNING tanks that are not pressure-testable due to the accessories on the tank. All underground tanks/compartments shall be adequately 6.2.2.Use the following procedure for this test: vented to prevent the development of vacuum or pressure • Seal off the influent and effluent piping,and any fittings that when filling or emptying the tank.Failure to properly vent are below the tank top with watertight caps or plugs. a tank or compartment could cause tank failure,and could • Fill the tank with water to a level that is 3 inches[7.6 cm]into result in death or serious injury. the access openings after the backfill is at least 75 percent of the 7.3.1.The primary tank is designed to operate at atmospheric way up the tank. pressure. • Let the water stand in the tank for a minimum of 1 hour(or longer if required by applicable local codes). 7.3.2.The tank's venting system must be adequately sized to ensure • Allow sufficient time so that the water temperature stabilizes. that atmospheric pressure is maintained at all times,including during • If the water level drops,check to see that plugs or caps sealing off filling and emptying of tank. the piping are tight.Then add more water to fill air voids and return 7.3.3.Whenever installing overfill protection,such as an alarm,an the water level back to the standard testing level. automatic shut-off device(fill pipe flapper valve)or a vent-restriction • If the water level does not stabilize,contact the manufacturing facility device(ball-float valve),follow the instructions provided by the manu- that shipped the tank. facturer of the overfill-protection device and consult the authority having jurisdiction to determine the level at which the overfill protection should 7: PIPING, VENTING AND operate. • Some jurisdictions do not allow ball-float valves. CONTAINMENT SUMPS • Consult applicable codes and regulations. 7.1.INTERNAL PIPING A WARNING Vent-restriction devices for overfill should not be installed if 7.1.1.All piping must conform to all applicable codes and standards. owner/operator will allow pump-or pressure-filling of tank. Failure to follow this warning could cause tank failure, and could result in death or serious injury. 23