Issue Date: April 18, 1997
Revision Date: December 6, 2002
ProTank, Inc.
UTFP-5000 Ullage Tester
(Pressure Test)
Non-Volumetric Tank Tightness Test Method (Ullage)
| Certification | Leak rate of 0.1 gph with PD = 95.24% and PFA = 0%. |
|---|---|
| Leak Threshold | A tank system should not be declared tight when the pressure decay trend equals or exceeds ± 0.016 psi/hr. |
| Applicability | Gasoline, diesel, aviation fuel, fuel oil #4. Other liquids may be tested after consultation with the manufacturer. |
| Tank Capacity | Maximum ullage volume is 10,260 gallons. |
| Waiting Time | Minimum of 2 hours between delivery and testing. |
| Test Period | Minimum of 30 minutes (after data trend has been established). There must be no dispensing or delivery during test. |
| Test Pressure | Total pressure of 4.0 psi must be applied at bottom of tank. |
| Temperature | Ullage must be monitored during test, and a correction factor is applied to account for temperature changes. If ullage temperature changes exceed 5 degrees F, test must not be conducted. |
| Groundwater | Depth to groundwater in tank excavation backfill must be determined. If groundwater is above product level, net pressure must be maintained at a minimum of 1 psi in the ullage during test. |
| Comments | Not evaluated using manifolded tank systems. Evaluated using diesel. Tests only ullage portion of tank. Product-filled portion of tank must be tested using a volumetric underfill test method. |
- ProTank, Inc.
3545 Lomita Blvd., Suite G
Torrance, CA 90505
Tel: (800) 438-1111 - Evaluator: ADA Technologies, Inc.
Tel: (303) 792-5615
Date of Evaluation: 04/10/92
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