Issue Date: June 20, 2012
August 13, 2012
OPW Fuel Management
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
CONTINUOUS IN-TANK LEAK
(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%.
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
aviation fuel, fuel Oil #4, Solvents and biodiesel blends B6-B20 meeting
ASTM D7467, biodiesel B100 meeting ASTM D6751.
||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
of 397,883 gallons.
||The waiting time required prior
to the collection of data after a delivery event is less than 3 hours.
||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.
product is determined by a minimum of 5 thermistors.
||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.
||System must be checked
annually and, if necessary, calibrated in accordance with
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
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
Ken Wilcox Associates
Santa Fe Dr.
Tel: (816) 443-2494
Hodgkins, IL 60525
Dates of Evaluation:
Tel: (708) 485-4200