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Issue
Date: October 19, 2007
Revision Date: June 27, 2011
Western Fiberglass, Inc.
Liquid-Filled
Reservoir for Double-Wall Sumps
with
Liquid Sensor Models WF-3 and WF-750
CONTINUOUS
INTERSTITIAL MONITORING METHOD (LIQUID FILLED)
Certification:
Certified as a continuous, liquid-filled interstitial
space leak detection system for use only with Western Fiberglass,
Inc., double-walled sumps or under dispenser containment sumps.
Operating Principle:
Hydrostatic monitoring using single-level float
switch. Methodology is similar to that which has been applied
to liquid-filled interstitial double-walled tanks.
Propylene glycol is used to fill the interstice of Western
Fiberglass’ double-walled sumps or under dispenser containment
sumps.
An interstitial liquid reservoir is connected to a port at
the highest point of the double-walled space.
Single-level liquid sensor model WF-3 or WF-750 monitor the
liquid in the interstitial reservoir and provide an alarm
if the liquid drops too low (egress of liquid).
Alarm Conditions:
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0.05 gph Leak, Plastic
Reservoir with WF-3 Sensor
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0.05 gph Leak, Stainless Steel
Reservoir with WF-750 Sensor
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Normal
Liquid Volume
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Minimum
Liquid Volume
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Normal
Liquid Volume |
Minimum
Liquid Volume |
*Volume of Liquid
Lost at Alarm (ml)
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41.8 |
2.5
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74.3
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16.7
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Time to Alarm (min) |
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<
1 |
<
1 |
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<
1 |
<
1 |
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Time to Reset (min) |
|
<
1 |
<
1 |
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<
1 |
<
1 |
*
Volume of liquid lost to alarm depends on the amount of liquid
in the reservoir. This amount is determined by the operator
when filling the reservoir. This amount needs to be sufficient
to prevent false alarms from occurring due to the normal fluctuations
in the reservoir which result from temperature and pressure
variations in the sump. Minimum alarm volumes were obtained
by filling the reservoir to the lowest possible level to reset
the alarm. While this condition provides the shortest response
time, it is also subject to the highest false alarm rate.
Applicability:
Western Fiberglass, Inc. underground double-walled sumps and under dispenser sumps designed to contain water, gasoline, gasohol, diesel, heating oil #2, kerosene, aviation fuel, or motor oil. Other liquids may be stored after consultation with the manufacturer.
Calibration:
Reservoir requires no calibration other than
to insure the upper reservoir is half full.
Sensors must be calibrated and maintained in accordance with
manufacturer’s instructions.
Comments:
Fluid reservoir volumes and connection tightness
between reservoir and sump should be inspected annually.
Liquid level in the stainless steel reservoir should be visible
in the sight glass.
Liquid level in the plastic reservoir should be approximately
one inch above the float switch.
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Western
Fiberglass, Inc.
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Evaluator:
Ken Wilcox Associates |
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1555
Copperhill Parkway
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Tel:
(816) 443-2494 |
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Santa
Rosa, CA 95403
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Date
of Evaluation: 12/20/2006 |
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Tel:
(707) 523-2050
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E-Mail:
sales@westernfg.com
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URL:
www.westernfg.com
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