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�J.MJIVKNOLO <br />:ECHNOLOCYFOR TANKS <br />AND THEIR ENVIRONMENT <br />i <br />Pre -Test Qualification Procedure <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 Houston <br />Quality Control_ <br />11. Safety check for tank bottom pressure diferential. <br />1 Enter tank diameter (A) in. <br />2. Enter Tank Top to Surface Distance (B) <br />In. <br />3. Calculate tank bottom to surface (A+B) = (C) in. <br />4. Enter water table distance from surface (D) in. <br />5. Subtract water table (D) from tank bottom (C) <br />to obtain (E) <br />in. <br />6. Calculate water head pressure at tank bottom <br />(E) x 0.03,6psi = (F) psi. <br />7. To obtain tank bottom pressure differential (G), ADD ,,rater read <br />pressure (F) and the probe set point (1.2 for steel or 0.5 for fiberglass tanks). <br />(F) + 1.2 = (G) or (F) 0.5 = (G) <br />Total diferential equals (G) psi <br />If total diferential (C) exceeds 4.00 psi DO NOT TEST <br />without special instructions from Houston Quality <br />Control. <br />Surface <br />T <br />T T <br />411111411 TANKNOLOGY CORPORATION INTERNATIONAL <br />-PEI ; Western Region • 4980-F Allison Parkway a Vacaville, CA 95888 <br />�••..,...•.; (707) 448.2494 9 (8001826-5837 a FAX (7071446-2495 <br />Top of'wat.er t°ble <br />FORM 7 <br />