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Issue Date: November 17,
2005
Franklin Fueling Systems
Secondary
Containment Monitoring (SCM)
Incon TS-SCM and EBW AS-SCM
CONTINUOUS INTERSTITIAL TANK
SYSTEM MONITORING METHOD (PRESSURE/VACUUM)
Certification:
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.
System 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 the interstitial vacuum level decreases at a rate
exceeding manufacturer’s allowable values.
Allowable values are based on an “AutoLearn line leak algorithm.” The unit will
record two curves (up curve and down curve) while a calibrated leak orifice is
connected to the interstitial space being monitored. The “up” curve is learned
while the vacuum pump is on and evacuating the interstice. The “down” curve is
learned when the vacuum pump is off and interstitial vacuum is decaying. During
normal operation when the vacuum level is between the upper and lower limits,
the system is continuously comparing vacuum decay rates to the learned curves
stored in memory.
Applicability:
Underground double-walled tank, connected double-walled piping,
and other connected interstitial spaces storing gasoline, gasohol, diesel,
heating oil #2, kerosene, aviation fuel, motor oil, water.
EN13160-2 requires the use of separate monitoring systems for separate USTs.
Manufacturer’s Specifications:
Alarm will activate when interstitial vacuum decreases to
approximately 1 psi vacuum (approx. 2”Hg).
Normal operating vacuum for the system is between 2”Hg and 6”Hg.
System does not restrict the vacuum source to 85±15 liters/hour flow rate at the
“Alarm On” vacuum level.
Volume of monitored interstitial space must not exceed 8 m3 (2114
gal) for tanks and 10 m3 (2642 gal) for piping.
When monitoring double-walled tanks, the system does not require a liquid stop
valve, a condensate trap or liquid sensors. Since the vacuum line is connected
to the pump siphon port, any liquid in the vacuum line will be returned to the
tank.
Suction line must be located at lowest point of interstitial space.
Calibration:
Functional and operational safety tests should be performed in
accordance with manufacturer’s instructions.
Initial calibration with known leak is performed at system installation, using
an orifice supplied by the manufacturer.
Comments:
Interstitial space is tested continuously.
Vacuum source is the submerged turbine pump siphon port.
Presence of a water table above the leak point will allow water to enter the
interstice rather than air or vapor. The water would be detected in the same
manner as fuel.
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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Franklin
Fueling Systems
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Evaluator: Ken Wilcox Associates
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3760 Marsh Road
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Tel: (816) 443-2494
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Madison, WI
53718
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Date of Evaluation: 11/11/04
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Tel: (800)
225-9787
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E-mail: info@franklinfueling.com |
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URL:
www.franklinfueling.com
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