|
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
|
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.
|
SGB (Sicherungsgeratebau
GmbH) |
Evaluator: TUV (Technischer Uberwachungs-Verein Nord e.V.) |
|
Hofstrabe 10 |
Date of Evaluation:
05/24/02 |
|
57076
Siegen,
Germany |
|
|
Tel: +49/ (0) 271 / 48964-0 |
|
|
E-Mail: Sgb-mail@t-online.de |
|
| 
