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UST Program - LG 113

UST Programs - LG 113

Issue Date: March 10, 2000 


Steel Tank Institute

Permatank Precision Interstitial Vacuum Monitor


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


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Equipment should be installed and operated in accordance with all applicable laws and regulations.
For full details, please refer to our expanded "DISCLAIMER" page.