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INSTALLATION PROCEDURES FOR UNOERGROUNO STORAGE TANKS <br /> GLASTEELL- BED AND BACKFILL : <br /> ALL EXCAVATED NATIVE SOIL MUST BE REPLACED WITH APPROVED BACKFILL . DO <br /> NOT BACKFILL IN LAYERS USING DIFFERENT MATERIALS . <br /> APPROVED BACKFILL MATERIALS ARE : <br /> I . CLEAN WASHED SAND <br /> 2 . GRAVEL <br /> A CLEAN . NATURALLY ROUNDED AGGREGATE WITH A MIX OF PARTICLE SIZES NOT <br /> LESS THAN 1 /8 ' NOR MORE THAN 3/4 ' IS REQUIRED . THIS MATERIAL IS <br /> COMMONLY CALLED PEA GRAVEL . <br /> 3 . STONE OR GRAVEL CRUSHINGS <br /> WASHED STONE OR GRAVEL CRUSHINGS WITH ANGULAR PARTICLE SIZE NOT LESS <br /> THAN 1 /8 ' NOR MORE THAN 1 /2 ' IS REQUIRED . <br /> LEAK TEST PROCEDURES FOR DOUBLE WALL TANK AT JOBSITE WHILE TANK <br /> TANK IS EMPTY : <br /> 1 . IF OUTER TANK IaAINTAINS AT LEAST 5 . 3 IN . HG . OF VACUUM FOR ONE HOUR <br /> BOTH THE INNER TANK AND OUTER TANK MAY BE CONSIDERED PROPERLY <br /> TESTED. <br /> 2 . INNER TANK TO BE PRESSURIZED AT NOT LESS THAN 3 PSI AND NOT MORE <br /> THAN 5 PSI MAXIMUM AND MAINTAINED WHILE CHECKING FOR PRESSURE DROP . <br /> 3 . AFTER MAKING SURE THERE IS NO PRESSURE DROP ( LEAKS ) MAINTAIN <br /> PRESSURE ON INNER TANK AND APPLY PRESSURE ON OUTER TANK . DO NOT <br /> EXCEED INNER TANK PRESSURE ON OUTER TANK . IF. THIS IS DONE IT COULD <br /> COLLAPSE THE INNER TANK . <br /> 4 . AFTER BEING ASSURED OF NO LEAKS . RELEASE PRESSURE ON OUTER TANK . <br /> THEN RELEASE PRESSURE ON INNER TANK . ACCURATE LOW PRESSURE GAGES MUST <br /> BE USED ON BOTH OUTER AND INNER TANK . ( 15 PSI MAXIMUM ON DIAL . ) CARE <br /> MUST BE TAKEN WHEN FILLING OUTER TANK WITH AIR DUE TO MUCH SMALLER <br /> VOLUME OF AIR REQUIRED FOR PRESSURE . <br /> TANK HANDLING : <br /> UNDERGROUND TANK( S ) ARE SUPPLIED WITH EITHER ONE OR TWO INSTALLED LIFTING <br /> LUGS . DEPENDENT ON TANK SIZE . REFER TO SPECIFIC TANK DRAWING TO DETERMINE <br /> THE EMPTY LIFTING WEIGHT OF THE TANK . SEE -FINISHING INSTRUCTIONS . " ITEM <br /> NUMBER 7 : FOR APPLICATION OF LIFTING LUG COVERS TO "GLASTEEL - TANKS PRIOR TO <br /> BACKFILLING OR COVERING THE TANK . <br /> DO NOT DROP OR ROLL TANK( S ) FROM TRUCK INTO EXCAVATED OPENING . <br /> LIFTING PROCEDURES : <br /> 0° MAXIMUM <br /> 50°MINIMUM <br /> ----------------------------------------- <br /> THESE <br /> --------------------------------------- <br /> THESE INSTALLATION INSTRUCTIONS TAKE PRECEDENCE OVER ACT 100 INSTRUCTIONS <br /> IN ANY AREA OF DIFFERENCE . <br /> 9/94 PAGE 2 OF 2 <br />