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UST Program - LG 113

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

Ibex Industries

Ibex Precision Test System

VOLUMETRIC TANK TIGHTNESS TEST METHOD (OVERFILL)

Certification	Leak rate of 0.1 gph with PD = 99.5% and PFA = 0.5%.
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. Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer.
Tank Capacity	Maximum of 18,000 gallons. Tank must be between 92 and 100% full.
Waiting Time	Minimum of 12 hours between delivery and testing. Minimum of 3 hours between "topping off" and testing. There must be no product dispensing or delivery during waiting time.
Test Period	Minimum of 1 hour. Test data are acquired and recorded by system's computer. Leak rate is calculated from data determined valid by statistical analysis. There must be no dispensing or delivery during test.
Temperature	Average for product is determined by a minimum of 6 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 on bottom of tank during test.
Calibration	Level sensors must be calibrated in accordance with manufacturer's instructions before each test. Temperature sensors must be calibrated in accordance with manufacturer's instructions semi-annually.
Comments	Not evaluated using manifolded tank systems. Tests only portion of tank containing product.

Ibex Industries	Evaluator: Applied Research Center
Moved and left no forwarding address	Tel: (805) 664-2173
or phone number.	Date of Evaluation: 01/18/91

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