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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)


Certified as equivalent to European leak detection standard EN-13160-2, Part 2, as a Class I leak detection system.

Operating Principle:
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.

Alarm Condition:
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.

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.

Manufacturer’s Specifications:
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.

Functional and operational safety tests must be performed annually in accordance with manufacturer’s instructions.

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.

OPW Fuel Management Systems

Evaluator:  Ken Wilcox Associates

6900 Santa Fe Dr.

Tel:  (816) 443-2494

Hodgkins, IL 60525-9909

Date of Evaluation:  01/05/04, 04/17/06

Tel: 708-485-4200



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Equipment should be installed and operated in accordance with all applicable laws and regulations.  For full details, please refer to our expanded "DISCLAIMER" page.