Issue Date: April 18, 1997
Revision Date: November 21, 2002
ProTank, Inc.
VUP-5000 Underfill Tester
Volumetric Tank Tightness Test Method (Underfill)
| Certification | Leak rate of 0.1 gph with PD = 99.99% and PFA = 0.005%. |
|---|---|
| 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 11 and 95% full. |
| Waiting Time | Minimum of 6 hours between delivery and testing. None between dispensing and testing. There must be no delivery during waiting time. |
| Test Period | Minimum of 3 hours. Test data are acquired and recorded by system's computer. Leak rate is calculated from average of subsets of all collected data. There must be no dispensing or delivery during test. |
| Temperature | Average for product is determined by temperature sensor probes. A minimum 12 inches of product must be present for the temperature probes to operate properly. |
| Groundwater | Depth to groundwater in tank excavation backfill must be determined. If groundwater is above bottom of tank, product level must be adjusted during test to provide a minimum net pressure of 1 psi at bottom of tank during test. |
| Calibration | Temperature probes and floats must be checked for proper operation prior to each test. |
| Comments | Not evaluated using manifolded tank systems. Tests only portion of tank containing product. As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure). Consistent testing at low levels could allow a leak to remain undetected. EPA leak detection regulations require testing of the portion of the tank system which routinely contains product. |
- ProTank, Inc.
3545 Lomita Blvd., Suite G
Torrance, CA 90505
Tel: (800) 438-1111 - Evaluator: ADA Technologies
Tel: (303) 792-5615
Date of Evaluation: 09/09/92
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