Issue Date: September 1, 2004
Revision Date: April 8, 2011
Containment Leak Detection (SCLD)
TLS-350/ProMax/EMC Console with Vacuum Sensors 857280-100, 200, 30x, or Assembly
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.
System 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 in the interstitial space decreases at a rate exceeding 85±15
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.
Storage of biodiesel
blends B6-B20 meeting ASTM D7467 and biodiesel B100 meeting ASTM D6751 would
also produce a system alarm if the system threshold is exceeded. Responses
to these fuels were not determined, but would be expected to be very similar to
the system's response when storing diesel.
Alarm will activate when interstitial vacuum decreases to 1.7 psi
Default maximum vacuum level (pump-off pressure) is 8 psi vacuum (16.3” Hg), but
can be set as low as
4 psi (8.2” Hg) if the monitored system requires that a lower level of vacuum be
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
When monitoring double-walled tanks, a liquid sensor must be located at lowest
point of interstitial space.
Functional and operational safety tests should be performed in
accordance with manufacturer’s instructions.
Interstitial space is tested continuously.
System is connected to the interstitial space by a single vacuum line.
Vacuum is generated by the turbine pump, and is measured and controlled by a
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.
Evaluator: Ken Wilcox
125 Powder Forest Dr.
Tel: (816) 443-2494
Date of Evaluation:
Tel: (860) 651-2700