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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- turer's suggested procedure, examine the drop tube and shutoff valve to determine if product flow will be completely shut off at 95 percent of tank capacity. Make any adjustments necessary to ensure that flow will be completely shut off when the tank is no more than 95 percent full. S. After inspection of the automatic shutoff device, reinstall the drop tube. 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 7-1. Check the drop tube and flapper for dam- age. Make sure that the flapper moves freely and will move into the product flow path. 7.1.7 Pass/Fall Criteria. If the automatic shut- off device functions as designed and complete shutoff of product flow is able to occur when the Link 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 Valves. The committee recommends that ball floats be removed from USTs as overfill preven- tion 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. 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. :W]