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Recommended Practices for the Testing and Verification of Spill,Overfill,Leak Detection and Secondary Containment Equipment at UST Facilities 7.3.3 Description of Test. The procedures in 8. Reconnect the probe cable and turn on power this test are for overfill alarms that are an integral to monitor. part of a typical ATG that uses magnetostrictive 9. Set the fuel float in the middle of the probe and probes for fuel level measurements in the UST.The verify that it is showing the correct inch read- ATG probe is removed from the tank. When the ing on the monitoring panel. product float is moved to the position correspond- ing to the 90 percent fill level, the alarm should 10.Slowly move the fuel float up the probe until activate. the overfill alarm is triggered. If the float is moved too quickly, it may not trigger the 7.3.4 Preparation. Use this test procedure in alarm conjunction with the monitoring system manufac- turer's installation and maintenance instructions. 11.Measure the distance from the bottom of the probe to the bottom of the fuel float (confirm Refer to the tank manufacturer's tank chart for the different manufacturers point of measurement capacity in gallons,the diameter and the volume of on the float) when the float first triggers the product that corresponds to the product level. alarm. When possible,print out the system setup to verify 12.On the tank chart, find the volume that corre- the proper configuration of the ATG. sponds to the height of the float and determine the percent of tank capacity. 7.3.5 Test Equipment. Test equipment shall include: Use this formula to determine the percent of tank capacity at which the alarm was triggered: • tools for the removal of the ATG probe; Percent Tank Capacity = (product volume • tape measure or gauge stick. when 90 percent alarm triggered/total tank 7.3.6 Test Procedure. volume)x 100 13.Clear the alarm condition. 1.Measure the product level in the tank riser where the ATG probe has been removed and 14.Compare the measurements in Steps 11 and 12 compare to the console reading to confirm ATG to the values programmed into the console. accuracy. If the reading does not agree, contact 15.Reinstall the ATG probe. the appropriate person. 2.Verify that the overfill alarm on the ATG is set to 7.3.7 Pass/Fail Criteria. provide a warning when the tank is no more than • If the overfill alarm(s)activates when the tank is 90 percent full. Consult the tank chart for the no more than 90 percent full, the overfill alarm inch-level setting for 90 percent tank volume. passes the test. 3.Verify on the ATG console that the overfill alarm • If the fuel level on the console does not agree circuit is operational. with the gauge stick reading,the system fails the 4.Activate the overfill alarm warning to verify test. its operation. If found defective, contact the • If the overfill alarm(s) does not activate in the appropriate person. test mode,it fails the test. 5.Remove the ATG probe cap and disconnect the • If the overfill alarm(s) does not activate or cable from the ATG. activates at any product level above 90 percent S.Remove the ATG probe from the tank. Use tank capacity,it fails the test. 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. pei.org