UST Programs - LG 113

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

Tank Automation, Inc.

Automated Precision Tank Testing System (APTT System) R-2

VOLUMETRIC TANK TIGHTNESS TEST METHOD (OVERFILL)

Certification	Leak rate of 0.1 gph with PD = 99% and PFA = 1%.
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 10 hours, 30 minutes between delivery and testing. Minimum of 2 hours, 30 minutes 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 for level measurement and by system's computer for temperature measurement. Leak rate is calculated from last 1 hour of test period data. There must be no dispensing or delivery during test.
Temperature	Average for product is determined by a minimum of 10 thermistors.
Groundwater	Groundwater presence must be determined to a depth of 5 feet below grade in tank excavation backfill. Product level must be a minimum of 5 feet 6 inches above grade to ensure a minimum net pressure of 1 psi at bottom of tank during test.
Calibration	Thermistors and level sensors must be checked annually and, if necessary, calibrated in accordance with manufacturer's instructions.
Comments	Not evaluated using manifolded tank systems.

Tank Automation, Inc.	Evaluator: Wildwood Engineering
P.O. Box 1395	Tel: Not Available
Wall, NJ 07719	Date of Evaluation: 11/14/90
Tel: (800) 762-4103

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.
For full details, please refer to our expanded "DISCLAIMER" page.