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LANDNOLOG Pre-Test <br /> OLOGY FOR TANKS Qual i f i cation <br /> EIR ENVIRONMENT 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) 9S/ in. <br /> 2. Enter Tank Top to Surface Distance (B) 3O 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) ? In. <br /> to obtain (E) <br /> 6. Calculate water head pressure at tank bottom Psi <br /> (E) x 0.036psi - (F) <br /> 7. To obtain tank bottom pressure differential (G), ADD water head <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 6 (G) <br /> Total diferential equals (G) psi <br /> If total diferential (G) exceeds 4.00 psi DO NOT TEST <br /> without special instructions from Houston Quality <br /> Control. <br /> Surf ace <br /> B Ip <br /> C <br /> Top of water table <br /> A E <br /> gr <br /> 'PE's TANKNOLOGY CORPORATION INTERNATIONAL <br /> -8563 Fax:(713)690-2255 <br /> TAK-24 5225 Hnllister SI. • Houstnn.Texas 77040-6294 • (713)690-8265• 1 18001 88R • <br />