UST Programs - LG 113

Issue Date: November 22, 1995
Revision Date: April 27, 2005

Purpora Engineering, Inc. (originally listed as Heath Consultants, Inc.)

Petro Tite II

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.
Tank Capacity	Maximum of 15,000 gallons. Tank must be minimum 100% full. An automatic product leveler must be used to maintain a constant product level during test.
Waiting Time	None between delivery and testing. There must be no dispensing or delivery during waiting time.
Test Period	Minimum of 2 hours. Test data are acquired and recorded manually. Leak rate calculated based on cumulative volume change during low level test (generally based on 1 hour average volume change). Product must be mixed continuously throughout test period. There must be no dispensing or delivery during test.
Temperature	Average for product is determined by a single DTS-2000 digital sensor.
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 a minimum net pressure of 4 psi at bottom of tank during test.
Calibration	Sensor calibration must be checked at each use and, if necessary, calibrated in accordance with manufacturer's instructions. The DTS-2000 digital sensor must be recertified a minimum of once every 3 years.
Comments	Not evaluated using manifolded tank systems.

Purpora Engineering LLC	Evaluator: Ken Wilcox Associates
P.O. Box 170591	Tel: (816) 443-2494
Milwaukee, WI 53207	Date of Evaluation: 11/01/90
Tel: (800) 352-2011
E-mail: sap@purporaengineering.com
URL: www.purporaengineering.com

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Equipment should be installed and operated in accordance with all applicable laws and regulations.
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