Issue
Date: November 17, 2005
Revision Date: February 3, 2011
Franklin
Fueling Systems
Secondary
Containment Monitoring (SCM)
Incon TS-SCM and EBW AS-SCM
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.
System 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 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.
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Applicability
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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.
*This evaluation determined the sensor's responses to the liquids shown above. Biodiesel blends B6-B20 meeting ASTM D7467 and biodiesel B100 meeting ASTM D6751 would also produce an alarm if the sensor threshold is exceeded. Responses to these fuels were not determined, but would be expected to be very similar to the diesel responses.
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Manufacturer's
Specifications
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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.
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Calibration
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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.
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Comments
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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. |
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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