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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities tank is no more than 95 percent full, the automatic shutoff device passes the inspection. If the automatic shutoff device does not function as designed or complete shutoff of product flow is unable to occur until the tank is more than 95 percent full, the automatic shutoff device fails the inspection. 7.2 Ball Float Vales. The PEI Overfill, Release Detection and Release Prevention Equipment Testing Committee recommends that ball floats be removed from USTs as overfill prevention devices and another method of overfill prevention be installed. 7.2.1 General. Ball float valves are designed to restrict product flow when product in the tank reaches a certain level by restricting vapor flow from the tank ullage. When vapor flow is restricted, pressure builds in the tank ullage, slowing the flow of product into the tank. To operate properly, the ball float valve must be properly installed, positioned at the correct height inside the tank and compatible with UST configu- ration. 7.2.2 Purpose. The purpose of this inspection is to verify that the ball float valve is installed prop- erly, operates as designed, and is set to restrict flow when the tank is no more than 90 percent full. FIGURE 7-2. Ball float assembly showing the ball in the open position. The ball will float and cover the vapor path if the product rises above the level of the cage. 7.2.3 Inspection Equipment. Test equipment shall include: • equipment to remove the vent restriction device; • tape measure. 7.2.4 Description of Inspection. The ball float valve assembly is removed from the tank, inspect- ed for proper operation and measured to ensure that the ball float assembly is the proper dimension to restrict flow into the tank when it is no more than 90 percent full. 7.2,5 Preparation. Refer to the manufacturer's tank chart for the capacity in gallons, the diameter and the volume of product with respect to product level. Use this test procedure in conjunction with the man- ufacturer's installation and maintenance instruc- tions. Visually verify that all tank -tap fittings are leak - free and vapor -tight before starting the test proce- dure. If any fittings arc loose, the ball float valve will not restrict flow. Inspect the drop tube to ensure that it does not have an overfill valve. 7.2.6 Inspection Procedure. 1. Remove the ball float valve assembly from the tank. 2. Visually inspect the ball float and cage. Remove any debris or foreign objects. FIGURE 7-3. To avoid damage when removing or rein- stalling the ball float, use an extractor tool recommend- ed by the bail float manufacturer. peLorg