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OCT 20 196 17:48 TO 12094640138 FROM Helmick/Lerner, Inc. T-673 P.05 <br /> Tank <br /> Institute <br /> .. COMPOSITE STEEL <br /> UNDERGROUND STORAGE <br /> I - * Khi& <br /> NOVEMBER 1995 <br /> 1.0 Excavation and Bedding to prevent washout of sand and prevent the infiltration <br /> of native soil into the backfill during the design life of <br /> 1.1 The excavation shall be free from any hard or sharp the system. <br /> material that may cause damage to the composite <br /> tank. (Care shall be taken during installation that 2.0 Initial Air Test at Jobsite <br /> foreign matter is not introduced into the excavation Tnd t he temporary plugs or backfill.) read protectors installed <br /> by the manufacturer shall be removed. Apply <br /> 1.2 Bedding and backfill material shall be clean, compatible,non-hardening pipe sealant to internal <br /> homogenous granular material made of either sand, bushing threads. Permanent metal plugs shall be <br /> pea gravel or#8 crushed stone,with no particle size installed at all unused openings. <br /> greater than ;V (13 mm)and shalt be free of sharp dielectric bushings in the tanks shall in <br /> edges which can damage the FRP laminate. remo am the unused openin s used to <br /> REMOVE LARGE OR SHARP ROCK ternporarify a tank for ove ground air test, <br /> FROM ExCMATION �,A but later removed installation,s, all not be <br /> I'MINIMUM I'MINIMUM over-tighten re she Een not to crossthread <br /> or daviagflFs non-metallic busfijbigg4thisn replacing <br /> SLOPE AS La_ gs or installing required tank piping. <br /> OETE9MINEDBY SOIL TYPE .x <br /> F NYLON <br /> 7 s- � BUSHING <br /> CIEAN.INERT SAND,.. <br /> r PEA ORAVEL i -- <br /> .� UR CRUSHED STONE. . <br /> APPLY U.L.CLASStFIED I NOTE.FULL tNS6RT0 <br /> 1.3 The bottom of the excavation shall be covered to a PIPE SEALANT TO THE A OR PIPI=OR PF U¢TD <br /> depth of t foot, (305 mm)suitably graded and leveled. THE i rRE LSURFACE N I bELaTIN6 AS3ATEg4Ef ICAL <br /> 1.4 The excavation shall extend a distance of at least 1 BUSHING THREAD <br /> foot(305 mm)around the perimeter of the tank <br /> providing sufficient clearance. 2.3 Test pressure should be maintained at, but not <br /> ARCHOR . WWRAL exceed, 5 pounds per-square-inch (PSG) (34.47 <br /> STRAP THREADED KPA)while a soap solution is applied to the area of <br /> ADJUSTMEN pipe connections and watda. <br /> tN6UI.AnNG D I <br /> MATERIAL �� � ' <br /> ABOVE GROUND AIR TEST <br /> SOAP AREA OF PIPE <br /> yx r. ` CONNECTIONS <br /> ANCHOR ' „. AND MLDS <br /> 80LT � <br /> b'MINIMUM <br /> 401 <br /> 1.5 Where anchoring by means of a concrete Slat)is UNDMROUND <br /> required,the tanK shall not be placed directly on the STORAGE <br /> pad. Bedding material at least 6 inches(152 mm) TANK <br /> deep must be spread evenly over the dimensions of <br /> fihe pad to separate the tank from the pad.The tank <br /> shall not be placed on any other hard or sharp 2.4 Dual wall tanks will require different air pressure <br /> testingprocedures. Do not connect a high pressure air <br /> material. line dectly to the interstitial monitoring port.A factory <br /> 1.6 If installation is in a tidal area, the tank"bedding" applied vacuum within the interstitial space can be <br /> material should be#8 crushed stone or pea gravel. used in lieu of, or in addition to,the air test procedure- <br /> Sand backfill may be used only if measures are taken Consult tank fabricator for air test recommendations. <br />