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UST Program - LG 113
Absolute
Precision Testing Systems
APT/BKG
1000
VOLUMETRIC TANK TIGHTNESS TEST METHOD (OVERFILL)
| Certification | Leak rate of 0.05 gph with PD = 99.2310% and PFA = 0.5451%. |
| Leak Threshold |
0.02587
gph. A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold. |
| Applicability |
Gasoline,
diesel, aviation fuel, fuel oil #4. Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer. |
| Tank Capacity | Maximum of 6,000 gallons. Tank must be minimum 100% full. |
| Waiting Time | Minimum of 36 hours between delivery and testing. Minimum of 1.5 hours between "topping off" and testing. Total minimum waiting time is 36 hours. There must be no dispensing or delivery during waiting time. |
| Test Period |
Minimum
of 1 hour, 48 minutes. Volume data is collected and recorded by a computer. Leak rate is calculated from 1 minute of test. There must be a minimum of 10 tests performed to conclusively declare a tank tight or declare a leak. There must be no dispensing or delivery during test. |
| Temperature | Average for product is determined by a resistance temperature sensor. |
| Groundwater |
Depth
to groundwater in tank excavation backfill must be determined. If groundwater is above bottom of tank, product level must be adjusted to provide a height difference of 6 feet between product and water level. |
| Calibration |
Level
sensors must be calibrated before each test. Temperature sensor must be checked and, if necessary, calibrated in accordance with manufacturer's instructions. |
| Comments | Not evaluated using manifolded tank system. |
|
Absolute
Precision Testing Systems
|
Evaluator: Dixon Consulting Inc.
|
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Appearance
on this list is not to be construed as an endorsement by any regulatory
agency nor is it any guarantee of the performance of the method or equipment.
Equipment should be installed and operated in accordance with all applicable
laws and regulations.
For full details, please refer to our expanded "DISCLAIMER"
page.
