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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities i.3.3 ®escrlp4lon of %st. 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 correspond- ing to the 90 percent fill level, the alarm should activate. 7.3.4 Prepara@Ion. 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 %s4 Equipment. Test equipment shall include: • tools for the removal of the ATG probe; • tape measure or gauge stick. ,: 1. Measure the product level in the tank riser where the ATG probe has been removed and compare 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 appropriate 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. 7. Inspect the probe. The floats must move freely on the stem without binding. s3. Reconnect the probe cable and turn on power to monitor. 9. Set the fuel float in the middle of the probe and verify that it is showing the correct inch read- ing on the monitoring panel. 1®. Slowly move the fuel float up the probe until the overfill alarm is triggered. If the float is moved too quickly, it may not trigger the alarm. . Measure the distance from the bottom of the probe to the bottom of the fuel float (confirm different manufacturers point of measurement on the float) when the float first triggers the alarm. �.2.On the tank chart, find the volume that corre- sponds to the height of the float and determine the percent of tank capacity. Use this formula to determine the percent of tank capacity at which the alarm was triggered: Percent Tank Capacity = (product volume when 90 percent alarm triggered/total tank volume) x 100 13. Clear the alarm condition. 14. Compare the measurements in Steps 11 and 12 to the values programmed into the console. 1.5. Reinstall the ATG probe. • If the overfill alarms) activates when the tank is no more than 90 percent full, the overfill alarm passes the test. • If the fuel level on the console does not agree with the gauge stick reading, the system fails the test. • If the overfill alarms) does not activate in the test mode, it fails the test. • If the overfill alarms) does not activate or activates at any product level above 90 percent tank capacity, it fails the test.