Issue Date: November 22, 1995
Revision Date: November 6, 1997
Schuster Instruments
Tel-A-Leak 1
Volumetric Tank Tightness Test Method (Overfill)
| Certification | Leak rate of 0.1 gph with PD = 99.86% and PFA = 0.14%. |
|---|---|
| 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 15,000 gallons. Tank must be minimum 100% full. |
| Waiting Time | Minimum of 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 manually and by system's computer. Leak rate is calculated from average of the last 10 consecutive 6 minute readings. There must be no dispensing or delivery during test. |
| Temperature | Average for product is determined by a minimum of 10 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 at bottom of tank during test. |
| Calibration | Temperature sensors must be checked annually and calibrated annually in accordance with manufacturer's instructions. |
| Comments | Not evaluated using manifolded tank systems. |
- Schuster Instruments
211 E. Grove St.
Kawkawlin, MI 48631
Tel: (517) 684-6638 - Evaluator: W. A. Kibbe and Associates
Tel: (517) 797-2425
Date of Evaluation: 11/26/90
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