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A KNOLOG <br />TECHNOLOGY FOR TANKS <br />AND THEIR ENVIRONMENT <br />Pre -Test <br />Qualification <br />Procedure <br />S.O.# 1, <br />Lj� 7 , CUST. � SITE # yS�7,5_ <br />I. If the tank product level is less than 5% or more than 90% of tank <br />capacity,. Do not test without specific instructions from your Region <br />Quality Control. <br />II. Safety check for tank bottom pressure differential. <br />1 Enter tank diameter (A) y� in. <br />2. Enter Tank Top to Surface Distance (B) 3 s_ in. <br />3. Calculate tank bottom to surface (A+B) = (C) 4) 7 in. <br />4. Enter water table distance from surface (D) P in. <br />5. Subtract water table (D) from tank bottom (C) <br />to obtain (E) � in. <br />*6. Calculate water head pressure at tank bottom <br />(E) x 0.036psi = (F) V psi. <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 />If total differential (G) exceeds 4.00 psi DO NOT TEST <br />without special instructions from your Region Quality <br />Control. *Give them the line 6 bottom pressure. <br />Surface <br />B D <br />C <br />Top of grater table <br />A E <br />Pre-test form 9/22/93 <br />TAK-24 (10/93) <br />