UST Programs - LG 113

Issue Date: April 22, 2003
Revision Date: June 10, 2004

SGB (Sicherungsgeratebau GmbH)

Vacuum Leak Detection System Models VLX 30, VLX 350, and VLX 400

CONTINUOUS INTERSTITIAL TANK SYSTEM MONITORING METHOD (PRESSURE/VACUUM)

Certification:
Certified per European leak detection standard prEN 13160-2, Part 2, Version 2, as a Class I leak detection system.

Operating Principle:
System uses an integral vacuum pump to continuously maintain a partial vacuum within the interstitial space of a double-walled tank. System is designed to activate a visual and acoustic alarm 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.

Alarm Condition:
System alarms when liquid enters the interstitial space or an air leak occurs where the interstitial vacuum decreases (pressure increases) to the appropriate “Alarm \'On\' Pressure" (See table below).

Applicability:
Double-walled or lined single-walled horizontal (underground or aboveground) cylindrical tank with flat or dished head, storing gasoline, gasohol, diesel, heating oil #2, kerosene, aviation fuel, motor oil, water. Other liquids such as hydrocarbons, chemical solvents or alcohols that can be stored at atmospheric pressure having vapors heavier than air may be used after consultation with manufacturer.

Manufacturer's Specifications:
The interstitial space shall be rated for the operating vacuum of the leak detector as indicated in the following table, regardless of temperature and groundwater level fluctuations

Calibration:
Functional and operational safety tests must be performed annually in accordance with manufacturer's instructions.

Comments:
Interstitial space is tested continuously.
System is connected to the interstitial space by a suction line and a pressure measuring line.
Vacuum is generated by an integral pump and is measured and controlled by a pressure switch.
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.