Franklin Fueling Systems TS 550 evo Fuel Management System Operators Guide - Manuel (Page 46)

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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 m
3 (2114 gal) for tanks and 10 m 3 (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.
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