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I PEMP1200 - 17 I Use this test procedure in conjunction with the as designed, flow restriction occurs when the tank manufacturer ' s installation and maintenance is no more than 90 percent full, and the tank-top instructions . fittings are vapor-tight. Visually verify that all tank-top fittings are leak- If any of the following configurations exist, the free and vapor-tight before starting the test proce- overfill prevention system fails the inspection: dure. If any fittings are loose, the ball float valve ball float valves are installed in storage systems will not restrict flow. that are equipped with suction pumps and air Inspect the drop tube to ensure that it does not have eliminators ; an automatic shut off device. the ball is cracked or damaged; 7 . 2. 6 Inspection Procedure. the ball float cannot be removed; 1. Remove the ball float valve assembly from the the orifice is not at the top of the assembly, or is tank. clogged with debris or corroded, which would 2 . Visually inspect the ball float and cage. Remove prevent proper air flow after activation; any debris or foreign objects . ball float valves are installed with coaxial Stage 3 . Check the ball for holes and cracks . It should I vapor recovery; move freely in the cage. Check for corrosion ball float valves are used on tanks equipped with that affects the operation of the ball float. remote-fill pipes and gauge openings without 4. Check the vent orifice in the vent-restriction the use of "trap door" devices ; or pipe. It must be open and located near the top of ball float valves are installed in storage systems the tank. that also are equipped with automatic shutoff devices and the ball float valve is set to restrict 5. Use the ball float valve manufacturer ' s flow before the tank is 95 percent full. installation procedure to determine if vapor flow will be restricted when the tank is no more than If the ball float valve does not function as designed, 90 percent full. flow restriction does not occur until the tank is 6. After inspection of the ball float valve assembly, more than 90 percent full, or the tank-top fittings reinstall it following the manufacturer 's installa- are not vapor-tight, the ball float valve fails the tion instructions . inspection . 7 . 2 . 7 Pass/Fall Criteria . The ball float valve NOTE : When permanently removing a ball passes the inspection if the ball float valve functions float, ensure that the entire assembly is removed so as not to interfere with other methods of overfill prevention. y 7. 3 Overfill Alarms . 7 . 3. 1. General . Overfill alarms provide an audi- ble and/or visible warning to the fuel delivery driver if the product level in the UST reaches the IV 90 percent level during a delivery. They are often an integral part of the automatic tank gauge (ATG) system. An overfill alarm does not stop or restrict product flow. Ir +_ 7.3 . 2 Purpose. The purpose of this inspection is to verify that the overfill alarm is operating cor- - rectly and is set to provide a warning when the tank FIGURE 7-3 . To avoid damage when removing or rein- is no more than 90 percent full. stalling the ball float, use an extractor tool recommend- ed by the ball float manufacturer. ® pei . org