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Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities 7.Using the automatic shutoff device manufac- To operate properly, the ball float valve must be turer's suggested procedure, examine the drop properly installed, positioned at the correct height tube and shutoff valve to determine if product inside the tank and compatible with UST configu- flow will be completely shut off at 95 percent of ration. tank capacity. Make any adjustments necessary to ensure that flow will be completely shut off 7.2.2 Purpose. The purpose of this inspection is when the tank is no more than 95 percent full. to verify that the ball float valve is installed prop- erly,operates as designed,and is set to restrict flow S.After inspection of the automatic shutoff device, when the tank is no more than 90 percent full. reinstall the drop tube. I FIGURE 7-1. Check the drop tube and flapper for dam- age. Make sure that the flapper moves freely and will in- move into the product flow path. 7.1.7 Pass/Fail Criteria. If the automatic shut- FIGURE 7-2. Ball float assembly showing the ball in the off device functions as designed and complete open position. The ball will float and cover the vapor shutoff of product flow is able to occur when the path if the product rises above the level of the cage. tank is no more than 95 percent full,the automatic shutoff device passes the inspection. 7.2.3 Inspection Equipment. Test equipment If the automatic shutoff device does not function shall include: as designed or complete shutoff of product flow . equipment to remove the vent restriction device; is unable to occur until the tank is more than 95 percent full, the automatic shutoff device fails the • tape measure. inspection. 7.2.4 Description of Inspection. The ball float 7.2 Ball Float Valves. The committee recommends valve assembly is removed from the tank,inspect- that ball floats be removed from USTs as overfill preven- ed for proper operation and measured to ensure that tion devices and another method of overfill prevention be the ball float assembly is the proper dimension to installed. restrict flow into the tank when it is no more than 90 percent full. 7.2.1 General. Ball float valves are designed to restrict product flow when product in the tank 7.2.5 Preparation. Refer to the manufacturer's reaches a certain level by restricting vapor flow tank chart for the capacity in gallons,the diameter from the tank ullage.When vapor flow is restricted, and the volume of product with respect to product pressure builds in the tank ullage,slowing the flow level. of product into the tank. peLorg