Laserfiche WebLink
During the test period , changes in product volume are <br /> measured in the standpipe with a graduated cylinder. The average <br /> product temperature is also measured and recorded every 15 <br /> minutes . The product volume changes are adjusted or compensated <br /> for expansion or contraction that will result as temperature <br /> changes . The product volume changes versus temperature are <br /> calculated, using the known coefficient of expansion for products <br /> taken from reference tables . <br /> If the tank and/or piping system is leaking at a detectable <br /> rate, the accumulated data over an hour will show a net loss of <br /> 0 .05/gallon or greater. <br /> 3.2 Horner EZY-CHEK <br /> This method measures volumetric change of product in the <br /> filled tank, filled tank and piping system or tank/piping system <br /> and standpipe. The most frequently used approach has the tank <br /> and piping system filled to a level within about 12 inches of <br /> grade surface. All piping system and manway cavities should be <br /> vented to remove air/gas and completely filled with product. <br /> The method measures small liquid level changes in the <br /> fillpipe, which occur with product volume changes. A constant <br /> gas flow bubbler outlet is placed in the upper 1/2 inch of liquid <br /> in the fillpipe. As the liquid level changes, the resulting <br /> pressure change in the bubbler tube is recorded. Thus volume <br /> changes , which are directly related to liquid level , are <br /> recorded. <br /> -2- <br />