Issue Date: November 22, 1995
Revision Date: May 23, 2011
Hasstech
Leak Computer Tank Test System
Volumetric Tank Tightness Test Method (Overfill)
Hasstech is no longer in business
| Certification | Leak rate of 0.1 gph with PD = 95% and PFA = 5%. |
|---|---|
| Leak Threshold | 0.05 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 12,000 gallons. Tank must be minimum 100% full. |
| Waiting Time | Test data are acquired and recorded by system's computer that calculates a leak rate every minute, and determines waiting time for satisfactory data (test is finished when the standard deviation of 30 sequential leak rates is less than half of the last leak rate determined). There must be no dispensing or delivery during waiting time. |
| Test Period | Minimum of 1 hour, 10 minutes. Test data are acquired and recorded by system's computer. Leak rate is calculated from data determined to be valid by statistical analysis. There must be no dispensing or delivery of product during test. |
| Temperature | Average for product is determined by a minimum of 7 thermistors. |
| Groundwater | If depth to groundwater in tank excavation backfill cannot be determined, tank must pass a two level test with at least a 3 foot difference in product level. If depth to groundwater in tank excavation backfill can be determined, a single level test can be conducted provided a minimum net pressure of 1 psi exists at bottom of tank during test. |
| Calibration | Level sensor must be calibrated before each test. Thermistors must be checked and, if necessary, calibrated in accordance with manufacturer's instructions. |
| Comments | Not evaluated using manifolded tank systems. Evaluated at EPA Edison Risk Reduction Engineering Laboratory prior to the EPA standard protocols being written. System no longer being manufactured and no support is available. |
- Hasstech
Out of business
- Evaluator: U.S. EPA Risk Reduction
Engineering Laboratory
Tel: (201) 321-6631
Date of Evaluation: 11/88
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