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I 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 7.2.3 Inspection Equipment. Test equipment shutoff device passes the inspection. shall include: If the automatic shutoff device does not function • equipment to remove the vent restriction device; as designed or complete shutoff of product flow • tape measure. is unable to occur until the tank is more than 95 percent full, the automatic shutoff device fails the 7.2.4 Description of Inspection. The ball float inspection. valve assembly is removed from the tank, inspect- ed for proper operation and measured to ensure that 7.2 Ball float Vales. The PEI Overfill, Release the ball float assembly is the proper dimension to Detection and Release Prevention Equipment Testing restrict flow into the tank when it is no more than Committee recommends that ball floats be removed from 90 percent full. USTs as overfill prevention devices and another method of overfill prevention be installed. 7.2,5 Preparation. Refer to the manufacturer's tank chart for the capacity in gallons, the diameter 7.2.1. General. Ball float valves are designed and the volume of product with respect to product to restrict product flow when product in the tank level. reaches a certain level by restricting vapor flow from the tank ullage.When vapor flow is restricted, Use this test procedure in conjunction with the man- pressure builds in the tank ullage,slowing the flow ufacturer's installation and maintenance instruc- of product into the tank. tions. To operate properly, the ball float valve must be Visually verify that all tank-tap fittings are leak- properly installed, positioned at the correct height free and vapor-tight before starting the test proce- inside the tank and compatible with UST configu- dure. If any fittings arc loose, the ball float valve ration. will not restrict flow. 7.2.2 Purpose. The purpose of this inspection is Inspect the drop tube to ensure that it does not have to verify that the ball float valve is installed prop- an overfill valve. erty,operates as designed,and is set to restrict flow when the tank is no more than 90 percent full. 7.2.6 Inspection Procedure. 1.Remove the ball float valve assembly from the tank. 2.Visually inspect the 6a11 float and cage.Remove any debris or foreign objects. P� Ij V i 12- r .r ,r gg a �` _ "m wzag �� o- t's.#' rast � �' }x"x�?�.'�'� IS a4 - ry^�n��c M. 3 �>�a u:.n FIGURE 7-2. Ball float assembly showing the ball in the FIGURE 7-3. To avoid damage when removing or rein- open position. The ball will float and cover the vapor stalling the ball float, use an extractor tool recommend- path if the product rises above the level of the cage. ed by the ball float manufacturer. pei.org