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OVERCOMING UNDERGDOUND <br />ATER PRESSURES FOR HDROSAhTIS TANK TESTING <br />wl� 'o INTERNAL ADVANTAGE m -r <br />WITH OF 1.5 psi <br />CALCULATION SHEET <br />Z (Y -X).036 1.5 -Y <br />r <br />(1) SUBTRACT (Y -X) <br />(2) TAKE RESULT OF AND MULTIPLY BY .036 <br />(3) TAKE RESULT OF (2) AND ADD 1.5 <br />(4) TAKE RESULT OF ( 3 ) AND DIVIDE BY r <br />(5) TAKE RESULT OF (4) AND SUBTRACT Y <br />33 <br />(6) THE RESULT OF (5) EQUALS THE NUMBER OF INCHES OF PRODUCT ABOVE GRADE <br />A/0 <br />