Revision Date: November 6, 1997
Tank Automation, Inc.
Automated Precision Tank Testing System (APTT System) R-2
Volumetric Tank Tightness Test Method (Overfill)
| Certification | Leak rate of 0.1 gph with PD = 99% and PFA = 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 15,000 gallons. Tank must be minimum 100% full. |
| Waiting Time | Minimum of 10 hours, 30 minutes between delivery and testing. Minimum of 2 hours, 30 minutes 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 for level measurement and by system's computer for temperature measurement. Leak rate is calculated from last 1 hour of test period data. There must be no dispensing or delivery during test. |
| Temperature | Average for product is determined by a minimum of 10 thermistors. |
| Groundwater | Groundwater presence must be determined to a depth of 5 feet below grade in tank excavation backfill. Product level must be a minimum of 5 feet 6 inches above grade to ensure a minimum net pressure of 1 psi at bottom of tank during test. |
| Calibration | Thermistors and level sensors must be checked annually and, if necessary, calibrated in accordance with manufacturer's instructions. |
| Comments | Not evaluated using manifolded tank systems. |
- Tank Automation, Inc.
P.O. Box 1395
Wall, NJ 07719
Tel: (800) 762-4103 - Evaluator: Wildwood Engineering
Tel: Not Available
Date of Evaluation: 11/14/90
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