Issue Date: November 22, 1995
Revision Date: November 6, 1997

Schuster Instruments

Tel-A-Leak 1


Certification Leak rate of 0.1 gph with PD = 99.86% and PFA = 0.14%.
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 15,000 gallons. 
Tank must be minimum 100% full.
Waiting Time Minimum of 6 hours between delivery and testing. 
Minimum of 1 hour between "topping off" and testing. 
There must be no dispensing or delivery during waiting time.
Test Period Minimum of 1 hour. 
Test data are acquired and recorded manually and by system's computer. 
Leak rate is calculated from average of the last 10 consecutive 6 minute readings. 
There must be no dispensing or delivery during test.
Temperature Average for product is determined by a minimum of 10 temperature sensors.
Groundwater Depth to groundwater in tank excavation backfill must be determined. 
If groundwater is above bottom of tank, product level must be adjusted to provide net pressure of 2-4 psi at bottom of tank during test.
Calibration Temperature sensors must be checked annually and calibrated annually in accordance with manufacturer's instructions.
Comments Not evaluated using manifolded tank systems.


Schuster Instruments

Evaluator:  W. A. Kibbe and Associates

211 E. Grove St.

Tel:  (517) 797-2425

Kawkawlin, MI  48631

Date of Evaluation:  11/26/90

Tel:  (517) 684-6638



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