UST Programs - LG 113

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

Schuster Instruments

Tel-A-Leak 1

VOLUMETRIC TANK TIGHTNESS TEST METHOD (OVERFILL)

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. Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer.
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

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.
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