Issue Date: June 20, 2012

Revision Date:  August 13, 2012

OPW Fuel Management Systems

Site Sentinel Model iSite and Site Sentinel Integra with SLD Version 1
(Model 924B Magnetostrictive Probes with 2 inch diameter or 4 inch diameter Floats or Q0400-4xx Magnetostrictive Probe)

(Continuous Automatic Tank Gauging)


Single Tanks - Leak rate of 0.2 gph with PD = 99.9% and PFA = 0.5%.

Manifolded Tanks - Leak rate of 0.2 gph with PD = 97.7% and PFA = 0.1%.

Leak Threshold 0.1 gph. 
A tank system should not be declared tight and optionally a message printed for the operator and/or other method should be used to alert the operator, if the test results indicate a loss or gain that exceeds this threshold.

Gasoline, diesel, aviation fuel, fuel Oil #4, Solvents and biodiesel blends B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751. 

Tank Capacity Maximum of 30,258 gallons for single tanks and for manifolded tank groups up to a maximum of 3 tanks.  System is able to collect data for tests between 14.7% and 93.7% full.
Throughput Monthly maximum of 397,883 gallons.
Waiting Time The waiting time required prior to the collection of data after a delivery event is less than 3 hours.
Test Period Data collection time ranges from 28 to 30 days. 
Data sampling frequency is every 1 to 4 seconds. 
System collects data at naturally occurring product levels without interfering with normal tank operation, and discards data from unstable periods when system performs test.
Temperature Average for product is determined by a minimum of 5 thermistors.
Water Sensor Must be used to detect water ingress. 
Minimum detectable water level in the tank is 0.848 inch for all probe models 924B and Q400-4xx with 4" floats and 0.75 inch for 2" floats. 
Minimum detectable change in water level is 0.043 inch with 4" floats and 0.08 inch with 2" floats.
Calibration System must be checked annually and, if necessary, calibrated in accordance with manufacturer's instructions.

System reports a result of "pass" or "fail."
Evaluated using both single and manifolded tank systems
with probes in each tank
For valid monthly testing, a conclusive test report must be produced for each tank every month. 
System warns operator if there are no "passing" tests completed during the month. 
For very active tanks, a tank shut down may become necessary in order for the system to collect enough quiet-time data for a test. 
Constant and variable leaks were mathematically induced into tight tank test records which were collected by systems installed at various active tank sites.

The database for evaluation of the system included sites with vapor recovery.

Tanks used in this evaluation contained gasoline and diesel.


OPW Fuel Management Systems

Evaluator:  Ken Wilcox Associates

6900 Santa Fe Dr.

Tel:  (816) 443-2494

Hodgkins, IL 60525

Dates of Evaluation:  03/07/12, 07/24/12 

Tel: (708) 485-4200



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