Issue Date: March 10, 2000
Steel Tank Institute
Permatank Precision Interstitial Vacuum Monitor
Interstitial Tank Tightness Test Method
| Certification | Leak rate of 0.1 gph with PD = 100% and PFA =0%. |
|---|---|
| Leak Threshold | 0.01 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. |
| Tank Capacity | Maximum of 50,000 gallons. |
| Waiting Time | None. |
| Test Period | 12 hours for tanks less than 10,000 gallons. 24 hours for tanks 10,000 gallons to 50,000 gallons. |
| Comments | System performs post installation tank tightness test of Steel Tank Institute's double wall Permatank prior to adding product to tank. System conducts vacuum test on interstitial space between inner steel wall and outer fiberglass wall of Steel Tank Institute's Permatank and detects breaches in either inner or outer wall. For use only on Permatank underground storage tanks manufactured by Steel Tank Institute. Minimum initial vacuum on interstitial space is 13 inches mercury. Tank declared tight when vacuum decrease is less than 5 inches mercury over specified test period. Vacuum readings must be recorded on Steel Tank Institute's installation checklist. |
- Steel Tank Institute
570 Oakwood Rd.
Lake Zurich, IL 60047
Tel: (847) 438-8265 - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 03/25/93
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