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Issue Date: April 22, 2003
Revision Date: February 16, 2005
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.
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 |
|
VLX 30 |
1.2 + 0.25 psi |
0.7 + 0.25 psi |
Not
for use where suction line is mounted on top of tank. |
|
VLX 350 |
6.6 + 0.4 psi |
5.4 + 0.3 psi |
Tank diameter cannot exceed 10 feet 6 inches unless the suction line is
mounted at lowest point in the interstitial space.
|
|
VLX 400 |
7.4 + 0.4 psi |
6.1 + 0.3 psi |
Tank diameter cannot
exceed 12 feet unless the suction line is mounted at lowest point in the
interstitial space. |
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.
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SGB (Sicherungsgeratebau
GmbH) |
Evaluator: TUV (Technischer Uberwachungs-Verein Nord e.V.) |
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Hofstrabe 10 |
Date of Evaluation:
05/24/02 |
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57076
Siegen,
Germany |
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Tel: +49/ (0) 271 / 48964-0 |
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E-Mail: Sgb-mail@t-online.de |
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