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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.
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Model
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Pump “Off” Pressure
(Operating vacuum is reached)
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Alarm “On” Pressure
(Leak
exceeds pump capacity)
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Restrictions
for Tanks
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Restrictions
for Piping
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VL 30p
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1.2 + 0.25 psi
(2.44 + 0.5” Hg, or
83 + 17 mbar)
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0.7 + 0.25 psi
(1.43 + 0.5 ” Hg, or
48 + 17 mbar)
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Suction
line must be mounted at lowest point in the interstitial
space regardless of tank diameter.
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This type is not applicable for piping.
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VL 350p
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6.6 + 0.4 psi
(13.4 + 0.8 ” Hg, or
455 + 28 mbar)
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5.4 + 0.3 psi
(11 + 0.6 ” Hg, or
372 + 21 mbar)
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Tank
diameter cannot exceed 10 feet 6 inches unless the
suction line is mounted at lowest point in the interstitial
space.
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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.
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VL 400p
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7.4 + 0.4 psi
(15.1 + 0.8 ” Hg, or
510 + 28 mbar)
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6.1 + 0.3 psi
(12.4 + 0.6 ” Hg, or
421 + 2 mbar)
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Tank
diameter cannot exceed 12 feet unless the suction
line is mounted at lowest point in the interstitial
space.
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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.
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*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.
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SGB
(Sicherungsgeratebau GmbH)
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Evaluator:
TUV (Technischer Uberwachungs-Verein Nord e.V.)
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Hofstrabe 10
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Date
of Evaluation: 02/11/04
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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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