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12.1.3.1. Contamination can be avoided by doing one of the 13.2.6. If the tank is a dry-monitor, double-wall tank with the following: interstice not under vacuum, bleed pressure from the primary 12.1.3.1.1. ballast the tank with a liquid compatible with the tank to the interstice. product being stored,or 13.2.7.Hold and monitor the pressure in the interstitial space for 12.1.3.1.2, clean the tank after ballasting to eliminate any con- a minimum of 1 hour. If pressure drops in the interstice more taminating product. than 1 psig,contact the plant from which the tank was shipped. 13.2.8. Carefully release the air pressure from the tank. 13. POSTINSTALLATION TESTING 13.2.9. Remove the test manifold and replace the protective ® WARNING covers in the service fittings. Inert the tank and use inert gases(not air)to pressure test a 13.2.10. If the air test was not successful,contact the plant tank that contains or has contained flammable or combustible from which the tank was shipped, liquids or vapors.Failure to follow this warning could result in 13.3. OPTIONAL HYDROSTATIC TESTING an explosion,and could result in death or serious injury. 13.3.1.This optional test is typically used for water or wastewater ® WARNING tanks that are not air-testable due to the accessories on the tank. If flammable or combustible product is used as ballast,exer- 13.3.2.These instructions are for an optional hydrostatic test - cise special care in handling.Safeguard against sparks,fire or after backfilling is completed to the top of the tanks. product spills.Failure to follow this warning could result in a fire - or an explosion,and could result in death or serious injury. NOTICE 13.1. GENERAL If the tank is to be hydrostatically tested,it must be sup- 13.1.1.After backfill is brought close to the top of the tank, ported by backfill on all sides to at least 75 percent of the take a diameter measurement. way up the tank.Failure to follow this notice may result in damage to the tank and/or surrounding property. 13.1.2.Typically,tanks should be air tested before ballasting. 13.3.3.Seal off the influent and effluent piping,and any fittings 13.1.2.1. Do not use atmospheric air when testing air-testable that are below the tank top with watertight caps or plugs. tanks that have held product. Use nitrogen or other inert gas when testing these tanks. 13.3.4. Fill the tank with water to a level that is 3 inches into the access openings after the hole is backfilled at least 75 per- 13.2. AIR TESTING TANKS cent of the way up the tank. 13.2.1.If the tank is a wastewater tank equipped for air test- 13.3.5. Let the water stand in the tank for a minimum of 1 hour ing,follow the procedures in the Xerxes supplement, Preinstal- (or longer if required by applicable local codes). lation Testing Instructions for Water/Wastewater Tanks Factory-Equipped for Pressure Testing. See SECTION 20 for 13.3.6. If the water level drops,check to see that plugs or information on how to obtain this supplement. caps sealing off the piping are tight.Then add more water to fill air voids and return the water level back to the standard 13.2.2.All UL-labeled tanks, chemical tanks and potable water testing level.See Point 13.3.3. tanks must be air tested after backfill is brought close to the top of the tank. 13.3.7. If the water level does not stabilize,contact the plant 13.2.3.To air test a tank,pressurize the primary tank to 5 psig(3 psig from which the tank was shipped. for 12-foot-diameter tanks)using a test manifold(see FIGURE 3-2). 14, PIPING AND VENTING 13.2.3.1.Soap all service fittings and manways on the top of 14.1. INTERNAL PIPING - thetank. 14.1.1.All piping must conform to all applicable codes and NOTE: If the tank is ballasted with water,the tank can be standards. pressurized for air testing.See POINT 13.2.3. 13.2.4. If the interstitial space of the tank is filled with monitor- NOTICE ing fluid, check the fluid level and check that there is no moni- All internal piping must be at least 4 inches from the tank toring fluid in the interior of all tank compartments. bottom.Failure to follow this notice may result in damage to 13.2.4.1.Watch for active air bubbles in the reservoir,which the tank and/or surrounding property. indicate a problem. INOTICE 13.2.5. If the interstitial space of the tank was shipped under All metal fittings and other metal components must be coated vacuum and the factory-supplied vacuum has not been re- to protect against corrosion.Failure to do this may result in leased,check that the vacuum gauge shipped with the tank damage to these parts,the tank and/or surrounding property. reads 12 inches of mercury or more. 14.1.2. For tanks equipped with manways,refer to FIGURE 13.2.5.1. If the vacuum gauge reads less than 12 inches of 14-1 along with TABLE 14-1 to determine the correct dimen- mercury,contact the plant from which the tank was shipped. sions for sizing internal piping. 20