Issue Date: June 2, 2004
Revision Date: May 26, 2006
OPW
Fuel Management Systems
(originally listed as
Advanced Fuel Filtration Systems, Inc.)
Continuous
Vacuum Monitoring System (CVMS)
CONTINUOUS
INTERSTITIAL TANK SYSTEM MONITORING METHOD (PRESSURE/VACUUM)
Certification
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Certified
as equivalent to European leak detection standard EN-13160-2,
Part 2, as a Class I leak detection system.
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Operating
Principle
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System
uses vacuum generated by the turbine pump to continuously
maintain a partial vacuum within the interstitial space
of double-walled tanks and double-walled piping.
System is designed to activate a visual and acoustic alarm,
and optional turbine pump shutdown before stored product
can escape to the environment, and is capable of detecting
breaches in both the inner and outer walls of double-walled
tanks and double-walled piping.
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Alarm
Condition
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System alarms when a liquid
or air leak occurs which causes the interstitial vacuum
to decrease (pressure to increase) and the system is unable
to maintain minimum vacuum. System will also alarm if
liquid is detected in the interstitial space, or if the
vacuum level decreases to the designated "Pump On"
pressure a fixed number of times within a designated time
period. The current default values are 2 times within
5 minutes, but a qualified technician may adjust these
values at the time of installation. Maximum values
shall not exceed 24 times within 60 minutes.
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Applicability
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Underground double-walled
tank, connected double-walled piping, and other connected
interstitial spaces where tank and piping contain gasoline,
gasohol, diesel, heating oil #2, kerosene, aviation fuel,
motor oil, water.
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Manufacturer's
Specifications
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Leak detector operates at
a vacuum level between 20” and 120" H2O column (-0.72
and -4.33 psi.). The interstitial space shall be rated
for the operating vacuum of the leak detector, regardless
of temperature and groundwater level fluctuations. Volume
of monitored interstitial space must not exceed 8 m3 for
tanks and 10 m3 for piping. Suction line must be located
at lowest point of interstitial space.
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Calibration
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Functional
and operational safety tests must be performed annually
in accordance with manufacturer's instructions. |
Comments
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Interstitial space is
tested continuously.
System is connected to the interstitial space by a suction
line and a pressure measuring (vacuum sensing) line.
Vacuum is generated by the turbine pump and is measured
and controlled by a differential pressure switch.
Vacuum (air) leaks can be traced to a specific containment
area using a permanently installed vacuum dial gauge
assembly (optional).
System should be installed with a vacuum dial gauge
at the point furthest from the source of the vacuum.
This system may not be compatible with all secondarily
contained tanks and/or piping. Always consult with the
tank and/or piping manufacturer and the manufacturer's
applicable recommended installation practices before
installing this system, or damage may be caused to the
tank or piping by its use.
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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 60525-9909
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Dates
of Evaluation: 01/05/04, 04/17/06
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Tel: 708-485-4200
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Email: info@opwfms.com
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URL:
www.opwfms.com
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