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•' �+ TANK Molmaoww—FOR <br />i PER 'NCE IN <br />DOUBLE- LEAK DETEmON ..AND TANK TESTING <br />Background <br />Owens-Corning recommends the <br />Hydrostatic Tank Monitor for double-wall <br />tank monitoring because of its superior <br />leak detection capability. By filling the <br />cavity between the inner and outer tank <br />walls with a liquid, hydrostatic pressure <br />is continuously applied to both the <br />primary and secondary tank. This pres- <br />sure is capable of detecting tank leaks <br />in either the primary or secondary tank <br />walls for all installed circumstances. <br />The Hydrostatic Tank Monitor can also <br />serve the dual function of a precision <br />tank test. Because the hydrostatic pres- <br />sure is continuous, this tank testing <br />method is less prone to potential false <br />readings caused by minute changes in <br />product temperature, tank deflection <br />under loads, or human error. <br />The Hydrostatic Tank Monitor has been <br />independently tested and statistically <br />validated to meet the National Fire Pro- <br />tection Association's criteria as a preci- <br />sion tank test. This device is capable of <br />detecting leaks as small as OA5 gallons <br />per hour with a 99% probability of detec- <br />tion and a 0.1% probability of a false <br />alarm. <br />All of the Owens-Corning double-wall <br />tanks in this catalog include the "built- <br />in" hydrostatic tank monitor as a <br />standard feature. <br />4rete <br />Reservoir <br />Co <br />Traffic <br />Optlonal <br />Lquid Level Sensor <br />Pad <br />Stable Reservoir <br />Liquid Level <br />Stored <br />! <br />re; <br />Product <br />Double -Wall <br />Underground Tank <br />.� DrasReservoir <br />rkams <br />Inner <br />Wall <br />Breach <br />Normal Conditions <br />The reservoir liquid level will be stable <br />if both the inner and outer tank are tight. <br />The optional reservoir sensor will activate <br />an alarm if the reservoir drains or over- <br />fills. <br />Inner Wall Breach <br />Monitor fluid drains into the primary <br />tank causing the reservoir to drain. No <br />petroleum product escapes from the <br />primary tank to pollute the site. <br />Outer Wall Breach <br />If the groundwater is below the tank <br />top, the monitor fluid drains into the <br />ground causing the reservoir to drain. <br />If the groundwater is over the tank top, <br />the reservoir will overfill with ground- <br />water and activate the high level alarm <br />on the reservoir sensor. <br />E7 I. <br />El <br />