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Tank Installation InstRctions—All single and Able-wall tanks A1 . Handling A3. Pre-Installation Testing *ifting Tanks All tanks must be tested for leaks prior to installation using one of the seinslallation lift Iug(s)to lift tank. 4an1gle following methods.In the unlikely event a tank leak is discovered,call the ?r Larger tanks(10'and 12'dia.) O/C TAN KS Field Service Department to schedule a tank repair:phone have multiple lift lugs;all must be numbers are listed in section At 9. used.Guide the tanks with guide Testin Sin le Wall Tanks isual Air/Soo Testlines.Do not use chains or cables 9 9 N P ) around lank.Do not stand on tank Before installing tanks,remove fitting plugs,apply pipe dope and then while tank is being lifted. tighten fitting plugs.Pressurize 4'through 10'diameter tanks to 5 psi Onlyuselifting equipment to movemaximum:12'diameter tanks to 3 psi maximum.Cover the entire tank tanks.Capacity of lifting equip- outer surface with a soapy water solution(5 gallons of water with 8 ounces ment must be checked before of household dishwashing detergent).In freezing conditions,substitute 1 moving tanks. gallon of automotive windshield washer solution for 1 gallon of water. Double-wall tanks cannot be Soap the entire tank and fittings.The air test is of little value without soap- ing and a careful visual inspection for bubbles.Test at least 30 minutes to unloaded from the truck insure there are no leaks as indicated by soap bubbles ora drop in manually.Single wall fiberglass tanks,eight foot diameter or less.may pressure.Do not approach endcaps or manways while tanks are under be manually unloaded from the truck at the jobsite by the O/C TANKS pressure.Use an air gauge with half or quarter pound increments so that trained truck driver. changes in pressure can be easily observed.Do not use a vacuum Do not roll or drop tank.Fortemporary storage atthejobsite,settanks on gauge. smooth ground free of rocks and foreign objects and rechock with the Before backfilling to grade,O/C TANKS recommends a 5 psi air/soap test fires or sandbags provided. on all finished piping connections and unused fittings. if high winds are anticipated,the contractor is responsible for tieing down thetanks to prevent damage from being moved by high winds. Testing Double-Wall Tanks(Visual Air/Soap Test) Double-wall tanks 2,500 gallon capacity or larger may be delivered to the Before setting the the excavation, lu and ti hien all fittings. jobsite with bum per pads fastened to each end of the tank.The bum per 9 P 9 9 pads are removed du ring the air/soap test;the tank is installed without Pressure test tanks to 5 psi as follows: bumper pads. Outer Wall Test: A2. Bed and Backfill CAUTION:Pressurizing the tank cavity over 5 psi may damage the tank.For all tests,install an air gauge at the fitting where the air pressure hose is connected to the tank and a second gauge at the All excavated native soil must be other monitoring fitting.Use an air gauge with 1/.or 1h Ib. ? replaced with approved backfill. increments so that changes in pressure can be easily observed. 4 Do not mix a roved ravel natural) PP g Using the O/C TANKS supplied manifold system connected to the inner Y 1 with sand or native soil.Always tank and the cavil between the inner and outer tank,pressurize the tank rgraveld 3 use approved gravel.Do not cavity using air pressure from the inner tank. backfill n layers using sand or ns 4 native soil. Step#11: 1 If backfill does not meet With the manifold valve to the cavity closed,first pressurize the inner tank our 2 Y to 5 psi maximum. 1 the specified requirements, alternate materials may not be 4 used without written approval Pressurize the inner tank to 5 psi Maximum from O/C TANKS. *gauge to W supply Gravel ae supply calve open A clean naturally rounded aggre- ak gauge 1 gate with a mix of particle sizes not 4 less than 1/a"or more than%"is required. Crushed Stone or Crushed 3 Gravel crushed q Washed,crushed stone or gravelsystem(supplied vnih lank) stone 1 with angular particle size not less Step#1 moritanrig fining 2 than?angular more than 1h"are 1 required. 4 Note:All backfill materials must Step#2 meet ASTM C-33 paragraph 7.1 sClose upply air supply valve to the inner tank and then DISCCNNECT the air for quality and soundness.The supply. backfill should not have more than 3%passing a#8 sieve.The dry gravel density must be a minimum of 95 pounds per cubic foot. In freezing conditions backfill must be dry and free of Ice. Note:You shou Id require your backfill supplier to certify that the backfill meets this specification. . • 2