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UST Program - LG 113

Issue Date:: October 22, 2013

OPW Fuel Management Systems

Site Sentinel Nano
(Model 924B with 2 inch dia Floats)

AUTOMATIC TANK GAUGING METHOD

Certification	Leak rate of 0.2 gph with PD = 98.18% and PFA = 1.82% with 2" dia float.
Leak Threshold	0.1 gph for leak rate of 0.2 gph for 2" dia and 4" dia floats. 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. Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer.
Tank Capacity	Maximum of 20,000 gallons. Tank must be minimum 50% full for leak rate of 0.2 gph.
Waiting Time	Minimum of 6 hours between delivery and testing. There must be no delivery during waiting time.
Test Period	Average data collection time of 2 hours using 924B probe for leak rate of 0.2 gph. Test data are acquired and recorded by system's computer. There must be no dispensing or delivery during test.
Temperature	Average for product is determined by a probe containing 5 thermistors.
Water Sensor	Minimum detectable water level that can be detected by the 2" dia float is 0.75 inch. Minimum detectable change in water level that can be detected by the 2" dia float is 0.080 inch.
Calibration	Thermistors and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions
Comments	Not evaluated using manifolded tank systems. Therefore, this certification is only applicable when there is a probe used in each tank and the siphon is broken during testing. Tests only portion of tank containing product. As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure). Consistent testing at low levels could allow a leak to remain undetected. EPA leak detection regulations require testing of the portion of the tank system which routinely contains product. 2012 console comparison with OPW iSite; which was based on 2-26-2008 evaluation of OPW iSite.

California regulations require at least one test per month after routine product delivery or when the tank is filled to within 10% of the highest operating level of previous month.

OPW Fuel Management Systems	Evaluator: Ken Wilcox Associates
6900 Santa Fe Dr.	Tel: (816) 443-2494
Hodgkins, IL 60525	Date of Evaluation: 08/03/2013
Tel: (708) 485-4200
E-Mail: info@opwfms.com
URL: www.opwglobal.com

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