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YKNOL01 <br />TECHNOLOGY FOR TANKSJ <br />AND THEIR ENVIRONMENT <br />E <br />Pre -Test <br />Qualification <br />Procedure <br />S.O.# 1 CUST. ev" SITE # <br />tZ Y <br />the tank product level is less than 60% or more than 90% of tank <br />capacity, do not test without specific instructions from your Region <br />Ouality Control. <br />11. Safety check for tank bottom pressure differential. <br />1. Enter tank diameter (A) S in. <br />2. Enter Tank Top to Surface Distance (B) in. <br />3. Calculate tank bottom to surface (A+B) = (C) in. <br />C a 1) &U'A TC tL D GPT-. <br />4. Enter water table distance from surface (D) V- fiKF7- — in. <br />5. Subtract water table (D) from tank bottom (C) <br />to obtain <br />*6. Calculate water head pressure at tank bottom <br />036 <br />1 <br />7. To obtain tank bottom pressure differential (G), ADD water head <br />pressure (F) and the probe set point (2.0 for steel or 1.0 for fiberglass tanks). <br />(F) + 2.0 = (G) or (F) + 1.0 = (G) <br />Total differential equals (G) psi. <br />cei <br />TAK-24 (10/93) <br />Top of water table <br />Pre-test form 9/22/93 <br />