UST Programs - LG 113

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	Evaluator: Ken Wilcox Associates
570 Oakwood Rd.	Tel: (816) 443-2494
Lake Zurich, IL 60047	Date of Evaluation: 03/25/93
Tel: (847) 438-8265

Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the performance of the method or equipment.
Equipment should be installed and operated in accordance with all applicable laws and regulations.
For full details, please refer to our expanded "DISCLAIMER" page.