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KNO <br />TECHNOLOGY FOR TANKS <br />AND THEIR ENVIRONMENT <br />Pre-Test'. <br />Qualification <br />Procedure <br />S.O.# / �?,3L__ OUST.�a� ��oN SITE # f5775- <br />Pre-Test'. <br />s77s <br />I. If 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 />Quality Control. <br />II. Safety check for tank bottom pressure differential. <br />1. Enter tank diameter (A) <br />,(0 <br />in. <br />2. Enter Tank Top to Surface Distance (B) 31/ in. <br />3. Calculate tank bottom to surface (A+B) = (C) q in. <br />(,alar C-1- lA'1 i5 A-,- <br />4. <br />-4. Enter water table distance from surface (D) 16, 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 0.036 psi = (F) �✓ 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) IV14 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 />ti <br />TAK-24 (10/93) <br />Surface <br />B D <br />1 <br />E <br />.Top of water table <br />Pre-test form 9/22/93 <br />