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Issue Date: November 2, 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-point liquid level sensor, model WF-3 or WF-750, monitors the liquid in
the interstitial reservoir and provides an alarm if the liquid drops too low
(egress of liquid).
Alarm Conditions:
| |
0.05
gph Leak, Plastic
Reservoir with WF-3 Sensor |
|
0.05
gph Leak, Stainless Steel
Reservoir with WF-750 Sensor
|
|
Normal
Liquid
Volume |
Minimum
Liquid
Volume |
Normal
Liquid
Volume |
Minimum
Liquid
Volume |
|
*
Volume of Liquid
Lost at
Alarm (ml) |
41.8 |
2.5 |
74.3 |
16.7 |
|
Time to
Alarm (min) |
< 1 |
< 1 |
< 1 |
< 1 |
|
Time to
Reset (min) |
< 1 |
< 1 |
< 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.
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.
Western Fiberglass WF-3 and WF-750 sensors are for use only in specific Western
Fiberglass method applications, as listed.
|
Western Fiberglass,
Inc. |
Evaluator:
Ken Wilcox Associates |
|
1555 Copperhill
Parkway |
Tel:
(816) 443-2494 |
|
Santa Rosa, CA 95403 |
Date of Evaluation:
12/20/2006 |
|
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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