Issue Date: June 10, 2004

SGB (Sicherungsgeratebau GmbH)

Vacuum Leak Detection System Models VL 30p, VL 350p, and VL 400p

Continuous Interstitial Tank System Monitoring Method (Pressure/Vacuum)

Certification Certified per European leak detection standard EN 13160-2, Part 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 or double-walled piping.
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 or double-walled piping.
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, heating oil or diesel fuel, or double walled piping conveying those liquids. Other liquids can also be stored or conveyed if the Flashpoint is above 55 degrees C (no explosion protection required).
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.

Model Pump “Off” Pressure
(Operating vacuum is reached)		 Alarm “On” Pressure
(Leak exceeds pump capacity)		 Restrictions for Tanks Restrictions for Piping
VL 30p 1.2 ± 0.25 psi
(2.44 + 0.5” Hg, or
83 + 17 mbar)		 0.7 ± 0.25 psi
(1.43 ± 0.5 ” Hg, or
48 ± 17 mbar)		 Suction line must be mounted at lowest point in the interstitial space regardless of tank diameter. This type is not applicable for piping.
VL 350p 6.6 ± 0.4 psi
(13.4 ± 0.8 ” Hg, or
455 ± 28 mbar)		 5.4 ± 0.3 psi
(11 ± 0.6 ” Hg, or
372 ± 21 mbar)		 Tank diameter cannot exceed 10 feet 6 inches unless the suction line is mounted at lowest point in the interstitial space. Height between the low point of the interstice and node point* (the double-walled pipe may terminate higher than the node point without restrictions to the height if the pressure in the primary pipe does not exceed the given limits) cannot exceed 10 feet 6 inches.
VL 400p 7.4 ± 0.4 psi
(15.1 ± 0.8 ” Hg, or
510 ± 28 mbar)		 6.1 ± 0.3 psi
(12.4 ± 0.6 ” Hg, or
421 ± 2 mbar)		 Tank diameter cannot exceed 12 feet unless the suction line is mounted at lowest point in the interstitial space. Height “H” between the low point of the interstice and node point* (the double-walled pipe may terminate higher than the node point without restrictions to the height “H” if the pressure in the primary pipe does not exceed the given limits) cannot exceed 12 feet.

*Node Point – The point where the suction and measuring lines are connected together.
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. The VL ..p leak detector is not explosion protected. Do not install in a volatile, combustible or explosive atmosphere.
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.
  • SGB (Sicherungsgeratebau GmbH)
    Hofstrabe 10
    57076 Siegen, Germany
    Tel: +49/ (0) 271 / 48964-0
    Email: Sgb-mail@t-online.de
  • Evaluator: TUV (Technischer Uberwachungs-Verein Nord e.V.)
    Date of Evaluation: 02/11/04

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