Issue Date: November 22, 1995
Revision Date: November 6, 1997
Ibex Industries
Ibex Precision Test System
Volumetric Tank Tightness Test Method (Overfill)
| Certification | Leak rate of 0.1 gph with PD = 99.5% and PFA = 0.5%. |
|---|---|
| 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 18,000 gallons. Tank must be between 92 and 100% full. |
| Waiting Time | Minimum of 12 hours between delivery and testing. Minimum of 3 hours between "topping off" and testing. There must be no product 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 valid by statistical analysis. There must be no dispensing or delivery during test. |
| Temperature | Average for product is determined by a minimum of 6 temperature sensors. |
| 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 net pressure of 2-4 psi on bottom of tank during test. |
| Calibration | Level sensors must be calibrated in accordance with manufacturer's instructions before each test. Temperature sensors must be calibrated in accordance with manufacturer's instructions semi-annually. |
| Comments | Not evaluated using manifolded tank systems. Tests only portion of tank containing product. |
- Ibex Industries
Moved and left no forwarding address or phone number. - Evaluator: Applied Research Center
Tel: (805) 664-2173
Date of Evaluation: 01/18/91
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