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Pressure Variations <br /> Not applicable because no head pressure Induced by overfill . <br /> Tank Deflection <br /> The 12 hour wait after the last delivery before testing is sufficient for <br /> residual effects of tank wall deflection to be small . <br /> IV. PROTOCOL FOR USING TANK MONITOR AS AN UNDERGROUND TANK TEST <br /> 1 . Tank should be filled to 95k of capacity, <br /> 2 , wait for 12 hours after last delivery. Fuel cannot be dispensed or <br /> added during this period. <br /> j. Begin test by putting Tank Monitor In shut down mode. This mode is <br /> activated by removing key from. console . These must be run for a minimum <br /> of A hours after shut down mode Is activated. <br /> 1, OIHER KLY ADVANTAGES <br /> 0 As the Tank Monitor does not require any special set up or equlprncnt it <br /> can be activated to monitor for leaks at the operators convenience or <br /> anytime that the lank is not in use . <br /> 0 independent retest of the tank can be eoslly conducted at no cost to <br /> reduce the chance of false alarms or missed detection. <br /> o The Tank Monitor provides continuous fuel monitoring, precise inventory <br /> control and an operator/management Information system. <br /> g Highly precise acoustic measurement of fuel helght are made. Ibis <br /> allows leek detection tests to be made at any product level in the tank. <br /> o Average temperature change is measured over the entire vertical extent <br /> of the product In the tank, not just at one or a few locatlons. . <br /> o Requires no operator or pr.aperatory time and equipment for set up. <br /> 0 Tank Monitor can be activated for leak detection by operator or <br /> employees at the site . Does not require scheduling of third party <br /> operators to conduct test , <br /> JBM/mj <br />