Issue Date: November 22, 1995
Revision Date: November 6, 1997
Western Environmental Resources
AES System II (Large Tanks)
Volumetric Tank Tightness Test Method (Overfill)
| Certification | Leak rate of 0.1 gph with PD = 98.9% and PFA = 1.1%. |
|---|---|
| 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 75,000 gallons. Tank must be minimum 100% full. |
| Waiting Time | Minimum of 24 hours after delivery. Between "topping off" and beginning test, waiting time is computer-dictated by real-time analysis of level and temperature data and must be minimum of 1 hour. There must be no dispensing or delivery during waiting time. |
| Test Period | Minimum of 4 hours. Test data are acquired and recorded by system's computer. Leak rate is calculated from the last 3 hours of test period data. There must be no dispensing or delivery during test. |
| Temperature | Average for product is determined by a minimum of 12 thermistors. |
| 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 minimum net pressure of 2 psi at bottom of the tank during test. |
| Calibration | Level sensors must be calibrated before each test in accordance with manufacturer's instructions. Thermistors must be checked annually and, if necessary, calibrated in accordance with manufacturer's instructions. |
| Comments | Not evaluated using manifolded tank systems. |
- Western Environmental Resources
PO Box 37
Bakersfield, CA 93302
Tel: (805) 326-0173 - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 02/28/92
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