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Recommended Practices for the Testing and Verification of Spill,Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities <br /> 7. Using the automatic shutoff device manufac- To operate properly, the ball float valve must be <br /> turer's suggested procedure, examine the drop properly installed, positioned at the correct height <br /> tube and shutoff valve to determine if product inside the tank and compatible with UST configu- <br /> flow will be completely shut off at 95 percent of ration. <br /> tank capacity. Make any adjustments necessary <br /> to ensure that flow will be completely shut off 7.2.2 Purpose. The purpose of this inspection is <br /> when the tank is no more than 95 percent full. to verify that the ball float valve is installed prop <br /> erly,operates as designed,and is set to restrict flow <br /> S. After inspection of the automatic shutoff device, when the tank is no more than 90 percent full. <br /> reinstall the drop tube. <br /> `J <br /> Ilk. rs. <br /> O <br /> FIGURE 7-1. Check the drop tube and flapper for dam- 3 <br /> age. Make sure that the flapper moves freely and will <br /> move into the product flow path. <br /> 7.1.7 Pass/Fall Criteria. If the automatic shut- FIGURE 7-2. Ball float assembly showing the ball in the <br /> off device functions as designed and complete open position. The ball will float and cover the vapor <br /> shutoff of product flow is able to occur when the path if the product rises above the level of the cage. <br /> tank is no more than 95 percent full, the automatic <br /> shutoff device passes the inspection. 7,2,3 Inspection Equipment. Test equipment <br /> If the automatic shutoff device does not function shall include: <br /> as designed or complete shutoff of product flow . equipment to remove the vent restriction device; N <br /> is unable to occur until the tank is more than 95 <br /> percent full, the automatic shutoff device fails the • tape measure. <br /> inspection. 7.2.4 Description of Inspection. The ball float <br /> 7.2 Ball Float Valves. The committee recommends valve assembly is removed from the tank, inspect- <br /> that ball floats be removed from USTs as overfill preven- ed for proper operation and measured to ensure that <br /> tion devices and another method of overfill prevention be the ball float assembly is the proper dimension to <br /> installed. restrict flow into the tank when it is no more than <br /> 90 percent full. <br /> 7.2.1 General. Ball float valves are designed <br /> to restrict product flow when product in the tank 7.2.5 Preparation. Refer to the manufacturer's <br /> reaches a certain level by restricting vapor flow tank chart for the capacity in gallons, the diameter <br /> from the tank tillage.When vapor flow is restricted, and the volume of product with respect to product <br /> pressure builds in the tank tillage, slowing the flow level. <br /> of product into the tank. <br /> pei.org <br />