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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 IN-TANK LEAK
DETECTION METHOD
(Continuous Automatic Tank Gauging)
| Certification |
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. |
| Applicability |
Gasoline, diesel,
aviation fuel, fuel Oil #4, Solvents and biodiesel blends B6-B20 meeting
ASTM D7467, biodiesel B100 meeting ASTM D6751.
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| 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. |
| Comments |
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. |
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OPW Fuel Management Systems
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Evaluator:
Ken Wilcox Associates
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6900
Santa Fe Dr.
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Tel: (816) 443-2494
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Hodgkins, IL 60525
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Dates of Evaluation:
03/07/12, 07/24/12
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Tel: (708) 485-4200
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E-Mail:
info@opwglobal.com |
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URL: www.opwglobal.com |
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