Issue Date: November 22, 1995
Revision Date: November 6, 1997
Leak Detection Systems, Inc.
Tank Auditor, Version RTD V.2.16
Volumetric Tank Tightness Test Method (Overfill)
| Certification | Leak rate of 0.1 gph with PD = 99.98% and PFA = 0.02%. |
|---|---|
| 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, except as noted below. If using two level testing, the level is changed by 3 feet between the two tests and a tank system should not be declared tight if the net change between the two tests is greater than 0.02 gph. |
| 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 15,000 gallons. Tank must be minimum 100% full. |
| Waiting Time | Minimum is variable depending on site conditions, but not be less than 6 hours between delivery and testing. Minimum of 1 hour between "topping off" and testing. There must be no dispensing or delivery during waiting time. |
| Test Period | Minimum of 1 hour. 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 during test. |
| Temperature | Average for product is determined by a temperature averaging probe. |
| Groundwater | If depth to groundwater cannot be determined, two tests must be performed with a level change of at least 3 feet between tests. If depth to groundwater in tank excavation backfill can be determined and it is above bottom of the tank, product level must be adjusted to provide height differential of 3 feet between product and groundwater in tank excavation backfill during test. |
| Calibration | Temperature averaging probe and level sensors must be calibrated in accordance with manufacturer's instructions before each test. |
| Comments | Not evaluated using manifolded tank systems. Evaluation of system did not include a field evaluation of groundwater compensation by two level testing. |
- Leak Detection Systems, Inc.
106 Longwater Dr.
Norwell, MA 02061
Tel: (617) 878-7766 - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 11/29/91
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