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2. Pumping the fuel from the delivery tanker into the receiving <br /> tank. <br /> CSI installation instructions state that "pressurized product <br /> deliveries are not recommended as tank damage may occur". <br /> However, they go on to provide the following instructions in the <br /> event that the fuel delivery is pumped. <br /> • Install positive shut-off equipment in the lines and on the <br /> truck to prevent the tank from being overfilled. <br /> • Pressurization from over filling will damage the tank, even <br /> if the tank vent is unrestricted. <br /> • Do not use a ball float valve for overfill protection. <br /> When the delivery will be pumped, an acceptable method of <br /> providing tank over pressurization protection, for tanks <br /> 1,000 gallons or larger in capacity, is to install a shut-off valve in <br /> the tank fill tube set to close when the fuel level reaches 90% of <br /> the tank capacity. <br /> One such device is the OPW Model 61 FSTOP Overfill Prevention <br /> Valve. This valve is designed to prevent overfilling of above <br /> ground storage tanks by providing a positive shut-off during a <br /> pressurized-fill (pump-on fill) delivery. It threads into the fill <br /> opening and is an integral part of the fill tube. It may also be <br /> installed in an underground tank. The installation instructions <br /> include the proper positioning of the valve to provide shut-off <br /> when the fuel level reaches 90% of the tank capacity. <br /> In summary, a properly installed and operating OPW Model <br /> 61 FSTOP Overfill Prevention Valve or equivalent installed in the <br /> tank fill tube will provide the required tank protection against <br /> over pressurization. <br /> 2of2 <br />