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Certification |
Leak rate of 0.2 gph with PD = 96.6% and PFA = 3.35%. (FMP-LL2 Probe)
Leak rate of 0.2 gph with PD = 97.64% and PFA = 2.36%. (FMP-LL3 Probe)
Leak rate of 0.1 gph with PD = 96.4% and PFA = 3.64%. (FMP-LL2 Probe)
Leak rate of 0.1 gph with PD = 95.6% and PFA = 4.36%. (FMP-LL3 Probe)
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Leak Threshold |
0.1 gph for leak rate of 0.2 gph.
0.05 gph for leak rate of 0.1 gph.
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold. |
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Applicability |
Gasoline, diesel, aviation fuel, fuel oil #4, solvents, waste oil, bio-diesel and ethanol blends compatible with probe floats.
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Tank Capacity |
Maximum of 30,000 gallons for leak rate of 0.2 gph.
Maximum of 20,000 gallons for leak rate of 0.1 gph.
Minimum product level is 14% tank capacity. |
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Waiting Time |
Average of 6 hours between delivery and testing for leak rate of 0.2 gph.
Average of 6 hours 4 minutes between delivery and testing for leak rate of 0.1 gph.
None between dispensing and testing. |
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Test Period |
Length of the test is determined automatically based on quality of test data.
Average data collection time during evaluation was 7 hours 25 minutes for leak rate of 0.2 gph.
Average data collection time during evaluation was 5 hours 19 minutes for leak rate of 0.1 gph. (FMP-LL2 Probe)
Average data collection time during evaluation was 4 hours 17 minutes for leak rate of 0.1 gph. (FMP-LL3 Probe)
There must be no dispensing or delivery during the test. |
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Temperature |
Probe contains a minimum of 5 thermistors to monitor product temperature.
At least one thermistor must be submerged in product during testing. |
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Water Sensor |
Must be used to detect water ingress.
Minimum detectable water level in the tank is 0.201 inch (FMP-LL2 Probe).
Minimum detectable water level in the tank is 0.208 inch (FMP-LL3 Probe).
Minimum detectable water level change is 0.011 inch (Both FMP-LL2 and FMP-LL3 Probes). |
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Calibration |
Thermistors and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions. |
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Comments |
Not evaluated using manifolded tank systems. Therefore, this certification is only applicable when there is a probe used in each tank and the siphon is broken during testing.
Tests only portion of tank containing product.
As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure). Consistent testing at low levels could allow a leak to remain undetected.
EPA leak detection regulations require testing of the portion of the tank system which routinely contains product. |
