Date: June 2, 2004
Revision Date: May 26, 2006
OPW Fuel Management Systems
(originally listed as Advanced Fuel Filtration
Vacuum Monitoring System (CVMS)
CONTINUOUS INTERSTITIAL TANK SYSTEM MONITORING METHOD (PRESSURE/VACUUM)
Certified as equivalent to European leak detection standard EN-13160-2,
Part 2, as a
Class I leak detection system.
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.
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.
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
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.
Fuel Management Systems
Evaluator: Ken Wilcox
6900 Santa Fe Dr.
Tel: (816) 443-2494
Date of Evaluation: