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PEIlRP1200-12 3. Check the ball for holes and cracks. It should move freely in the cage. Replace any missing or defective parts. 4. Check the vent orifice in the vent -restriction pipe. It must be open and located near the top of the tank. 5. Use the ball float valve manufacturer's suggest- ed inspection procedure to determine if vapor flow will be restricted when the tank is no more than 90 percent full. Make any adjustments nec- essary to ensure that flow will be restricted when the tank is no more than 90 percent full. 6. After inspection of the ball float valve assembly, reinstall it following the manufacturer's installa- tion instructions. 7.2.7 Pass/Fail Criteria. The ball float valve passes the inspection if the ball float valve func- tions as designed, flow restriction occurs when the tank is no more than 90 percent full, and the tank - top fittings are vapor -tight. If any of the following configurations exist, the overfill prevention system fails the inspection: • ball float valves installed in storage systems that are equipped with suction pumps and air elimi- nators; • ball float valves installed with coaxial Stage I vapor recovery; • ball float valves used on tanks equipped with remote -fill pipes and gauge openings without the use of "trap door" devices; or • ball float valves installed in storage systems that also are equipped with automatic shutoff devices and the ball float valve is set to restrict flow before the tank is 95 percent full. If the ball float valve does not function as designed, flow restriction does not occur until the tank is more than 90 percent full, or the tank -top fittings are not vapor -tight, the ball float valve fails the inspection. 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 90 percent level during a delivery. They are often an integral part of the ATG system. An overfill alarm does not stop or restrict product flow. 0 pei.org 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 is no more than 90 percent full. 7.3.3 Description of Test. The procedures in this test are for overfill alarms that are an integral part of a typical ATG that uses magnetostrictive probes for fuel level measurements in the UST. The ATG probe is removed from the tank. When the product float is moved to the position cor- responding to the 90 percent fill level, the alarm should activate. 7.3.4 Preparation. Use this test procedure in conjunction with the monitoring system manufac- turer's installation and maintenance instructions. Refer to the tank manufacturer's tank chart for the capacity in gallons, the diameter and the volume of product that corresponds to the product level. When possible, print out the system setup to verify the proper configuration of the ATG. 7.3.5 Test Equipment. Test equipment shall include: • tools for the removal of the ATG probe; • tape measure or gauge stick. 7.3.6 Test Procedure. 1. Measure the product level in the tank and com- pare to the console reading to confirm ATG accuracy. If the reading does not agree, contact the appropriate person. 2. Verify that the overfill alarm on the ATG is set to provide a warning when the tank is no more than 90 percent full. Consult the tank chart for the inch -level setting for 90 percent tank volume. 3. Verify on the ATG console that the overfill alarm circuit is operational. 4. Activate the overfill alarm warning to verify its operation. If found defective, contact the appro- priate person. 5. Remove the ATG probe cap and disconnect the cable from the ATG. 6. Remove the ATG probe from the tank. Use care to ensure that the product float on the stem does not catch on the bottom of the riser during removal.