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Tank Installation Instr�ions—All single and dmwole-wall tanks j Ai. Handling A3. Visual Air/Soap Testing Lifting Tanks Testing Single Wall Tanks Use inslallaGonlAt lug(sj to lift tank. Before installing tanks.remove fitting plugs,apply pipe dope and then I`. Larger tanks(10'and12'dia.) tighten fitting plugs.Pressure test 4'through l O'diameter tanks to 5 psi. have multiple lift lugs;all must be 12'diameter tanks to 3 psi.Soap the entire lank and fittings.The air test is used.Guide the tanks with guidegangle of little value without soaping and a careful visual inspection for bubbles. lines.Do not use chains or cablesgo" Test at least 30 minutes to insure there are no leaks as indicated by soap around tank.DO NOT STAND ON bubbles or a drop in pressure.Do not approach endcaps or manways-TANK WHILE TANK IS BEING while tanks are under pressure.Use an air gauge with half or quarter LIFTED. pound increments so that changes in pressure can be easily observed. Only use lifting equipment to move Do not use a vacuum gauge. tanks.Capacity of lifting equip- Before backfilling to grade,O/C Tanks recommends a 5 psi air/soap test ment must be checked before on all finished piping connections and unused fittings. movingtanks. Double-walf tanks cannot be Testing Double-Wall Tanks unloaded from the truck manually.Single wall fiberglass tanks,12,000 Double-wall tanks are shipped to the jobsite with a vacuum on the tank gallon capacity or less,may be manually unloaded from the truck at the cavity between the inner and outer lank.The vacuum should be left on the jobsite by the O/C Tanks trained truck driver. tank until the tank is ready to be air tested by the contractor.In the unlikely Do not roll or drop tank.For temporary storage at the jobsite,set tanks on event of shipping damage,this temporary vacuum serves as an early smooth ground free of rocks and foreign objects and rechock with the warning device.The vacuum can detect relatively"large"leaks in the tires or sandbags provided. inner or outer tank,but it cannot detect"small"leaks.Therefore prior to high are anticipated,the contractor responsible for tieing down Installation,all tanks must also be air tested and soaped using the If hi g pa following procedure: the tanks to prevent damage from being moved by high winds. Double-wall tanks 2,500 gallon capacity or larger are delivered to the job- excavation the plugvacan in the tank cavity. Pressefore setting tanks tohe 5 the site with bumper pads fastened to each end of the tank.The tank may be follows: plug and tighten all fittings.Pressure test tanks to5psi as installed with or without the bumper pads attached. 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 1 All excavated native soil must be pressure hose is connected to the tank and a second gauge at the replaced with approved backfill. other monitoring fitting.Use an air gauge with Y4 or%lb. 4 DO NOT MIX APPROVED increments so that changes in pressure can be easily observed. naturally GRAVEL WITH SAND OR NATIVE Using the OCF supplied manifold system connected to the inner tank and rounded SOIL.Alwaysusea roved the cavil between the inner and outer lank,pressurize the tank cavity gravel 3 gravel.Do ot back6lPin layers using air pressure from the inner tank. p 4 using sand or native soil F- 1 Step#1: j\ If your backfill does not meet With the manifold valve to the cavity closed,first pressurize the inner tank the specified requirements, to 5 psi maximum. 4 alternate materials may not be tog used without written approval from O/C Tanks. Pressurize the inner tank to 5 psi Maximum Gravel 10 dfiupply a^R arses* A clean naturally rounded agg re- CbBeO va^'e open 1 gate with a mix of particle sizes not xgage gw q less than ya"or more than 3/4"is j 1 required. Crushed Stone or Crushed crushed3 Gravel scone 4 1 Washed,crushed stone or gravel ".v:aa shrenr(swcrea w+m rarxl with angular particle size not less 2 than required. more than'h"are Step#1 nxxga:yrm5 1 � required. 4 Note:All backfill materials must Step#2 meet ASTM C-33 paragraph 7.1 Close the air supply valve to the inner tank and then DISCONN ECT 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 should require your backfill supplier to certify that the backfill meets this specification. j ft r 2