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Certification |
Leak rate of 0.2 gph with PD = 97.49% and PFA = 2.51%.
Leak rate of 0.1 gph with PD = 97.10% and PFA = 2.90%.
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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, other
bio-diesel and ethanol blends compatible with probe floats. |
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Tank Capacity |
Maximum of 20,650 gallons.
Tank must be minimum 14% full for leak rate
of 0.2 gph.
Tank must be minimum 15% full for leak rate of 0.1 gph. |
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Waiting Time |
Minimum of 8 hours between delivery and testing for leak rate of 0.2 gph.
Minimum of 12 hours between delivery and testing for leak rate of 0.1
gph.
There must be no delivery during waiting time. |
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Test Period |
Minimum collection time of 2 hours for leak rate of 0.2 gph.
Minimum
collection time of 4 hours for leak rate of 0.1 gph.
Test data are
acquired and recorded by system's computer.
There must be no
dispensing or delivery during test.
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Temperature |
Average for product is determined by a probe containing 5 thermistors. |
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Water Sensor |
Minimum detectable water level that can be detected is 0.681 inch.
Minimum detectable change in water level that can be detected is 0.0098
inch.
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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.
Evaluated with 2” diameter OPW fuel floats and
2” diameter DMP water floats.
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. |
