Issue Date: November 22, 1995
Revision Date: May 23, 2011


Leak Computer Tank Test System


Hasstech is no longer in business.

Certification Leak rate of 0.1 gph with PD = 95% and PFA = 5%.
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. 
Tank Capacity Maximum of 12,000 gallons. 
Tank must be minimum 100% full.
Waiting Time Test data are acquired and recorded by system's computer that calculates a leak rate every minute, and determines waiting time for satisfactory data (test is finished when the standard deviation of 30 sequential leak rates is less than half of the last leak rate determined). 
There must be no dispensing or delivery during waiting time.
Test Period Minimum of 1 hour, 10 minutes. 
Test data are acquired and recorded by system's computer. 
Leak rate is calculated from data determined to be valid by statistical analysis. 
There must be no dispensing or delivery of product during test.
Temperature Average for product is determined by a minimum of 7 thermistors.
Groundwater If depth to groundwater in tank excavation backfill cannot be determined, tank must pass a two level test with at least a 3 foot difference in product level.
If depth to groundwater in tank excavation backfill can be determined, a single level test can be conducted provided a minimum net pressure of 1 psi exists at bottom of tank during test.
Calibration Level sensor must be calibrated before each test. 
Thermistors must be checked and, if necessary, calibrated in accordance with manufacturer's instructions.
Comments Not evaluated using manifolded tank systems. 
Evaluated at EPA Edison Risk Reduction Engineering Laboratory prior to the EPA standard protocols being written. 
System no longer being manufactured and no support is available.



Evaluator:  U.S. EPA Risk Reduction

out of business

Engineering Laboratory


Tel:  (201) 321-6631


Date of Evaluation:  11/88


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