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12.1.3.1.Contamination can be avoided by doing one of the 13.2.7.Hold and monitor the pressure in the interstitial space for following: a minimum of 1 hour.If pressure drops in the interstice more 12.1.3.1.1.ballast the tank with a liquid compatible with the than 1 psig,contact the plant from which the tank was shipped. product being stored,or 13.2.8.Carefully release the air pressure from the tank. 12.1.3.1.2.clean the tank after ballasting to eliminate any con- 13.2.8.Remove the test manifold and replace the protective taminating product covers in the service fittings. 13. POSTINSTALLATION TESTING 13.2.10.If the air test was not successful,contact the plant from which the tank was shipped. WARNING 13.3. OPTIONAL HYDROSTATIC TESTING Inert the tank and use inert gases(not air)to pressure test a 13.3.1.This optional test is typically used for water or waste- tank that contains or has contained flammable or combustible water tanks that are not air-testable due to the accessories on liquids or vapors.Failure to follow this warning could result in the tank. an explosion,and could result in death or serious injury. 13.3.2.These instructions are for an optional hydrostatic test A WARNING after backfilling is completed to the top of the tanks. If flammable or combustible product is used as ballast,exer- CAUTION cise special care in handling.Safeguard against sparks,fire or product spills.Failure to follow this warning could result in a fire If the tank is to be hydrostatically tested,it must be sup- or an explosion,and could result in death or serious injury. ported by backfill on all sides to the top of the tank.Failure 13.1. GENERAL to follow this caution may result in damage to the tank and/or surrounding property. 13.1.1.After backfill is brought close to the top of the tank, take a diameter measurement. 13.3.3.Seal off the influent and effluent piping,and any fittings that are below the tank top with watertight caps or plugs. 13.1.2.Typically,tanks should be air tested before ballasting. 13.3.4.Fill the tank with water to a level that is 3 inches into 13.1.2.1.Do not use atmospheric air when testing air-testable the access openings after the hole is backfilled at least 75 per- tanks that have held product.Use nitrogen or other inert gas cent of the way up the tank. when testing these tanks. 13.3.5.Let the water stand in the tank for a minimum of 1 hour 13.2. AIR TESTING TANKS (or longer if required by applicable local codes). 13.2.1.If the tank is a wastewater tank equipped for air test- 13.3.6.If the water level drops,check to see that plugs or ing,follow the procedures in the Xerxes supplement,Preinstal- caps sealing off the piping are tight.Then add more water to lation Testing Instructions for Water/Wastewater Tanks fill air voids and return the water level back to the standard Factory-Equipped for Pressure Testing.See SECTION 20 for testing level.See Point 13.3.3. information on how to obtain this supplement. 13.3.7.If the water level does not stabilize,contact the plant 13.2.2.All UL-labeled tanks,chemical tanks and potable water from which the tank was shipped. tanks must be air tested after backfill is brought close to the top of the tank. 14. PIPING AND VENTING 13.2.3.To air test a tank,pressurize the primary tank to 5 psig 14.1. INTERNAL PIPING (3 psig for 12-foot-diameter tanks)using a test manifold(see FIGURE 3-2). 14.1.1.All piping must conform to all applicable codes and standards. 13.2.3.1.Soap all service fittings and manways on the top of the tank. CAUTION 13.2.4.If the interstitial space of the tank is filled with monitor- All internal piping must be at least 4 inches from the tank ing fluid,check the fluid level and check that there is no moni- bottom.Failure to follow this caution may result in damage toring fluid in the interior of all tank compartments. to the tank and/or surrounding property. 13.2.5.If the interstitial space of the tank was shipped under CAUTION vacuum and the factory-supplied vacuum has not been re- All metal fittings and other metal components must be leased,check that the vacuum gauge shipped with the tank coated to protect against corrosion.Failure to do this may reads 12 inches of mercury or more. result in damage to these parts,the tank and/or surrounding 13.2.5.1.If the vacuum gauge reads less than 12 inches of property. mercury,contact the plant from which the tank was shipped. 14.1.2.For tanks equipped with manways,refer to FIGURE 13.2.6.If the tank is a dry-monitor,double-wall tank with the 14-1 along with TABLE 14-1 to determine the correct dimen- interstice not under vacuum,bleed pressure from the primary sions for sizing internal piping. tank to the interstice. 20