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Appendix <br /> The leak rate for each interstice will affect the 'Time to No Vac',which is the time it would take for the vacuum to be <br /> lost if the STP did not turn on to replenish it. However,the smaller the volume, the greater the impact of a small <br /> leak on the 'Time to No Vac'. A general guideline is to eliminate any leaks so that the 'Time to No Vac' reads 100 <br /> hours, which is the maximum displayed value. <br /> Use the chart below to record Vac Sensor test values. <br /> TANK VAC SENSOR LEAK RATE TIME TO NO VAC <br /> (gph) (hr) <br /> Product Line <br /> Vapor Return Line <br /> Tank or Tank Vent <br /> Containment Sum <br /> Product Line <br /> Vapor Return Line <br /> Tank or Tank Vent <br /> Containment Sum <br /> Product Line <br /> Vapor Return Line <br /> Tank or Tank Vent <br /> Containment Sum <br /> Product Line <br /> Vapor Return Line <br /> Tank or Tank Vent <br /> Containment Sum <br /> Product Line <br /> Vapor Return Line <br /> Tank or Tank Vent <br /> Containment Sump <br /> A-1 <br />