Issue
Date: August 23, 1999
Revision Date: June 27, 2011
Containment
Solutions, Inc.
(originally listed as
Fluid Containment and O/C Tanks)
FCI
Liquid Filled Interstitial Monitor
Tank Model DWT6 with Model FHRB 810 Level Sensor
CONTINUOUS
INTERSTITIAL MONITORING METHOD (LIQUID FILLED)
Certification:
Certified
as a continuous, liquid-filled interstitial space leak detection
system for all size tanks manufactured by Containment Solutions,
Inc. at time of evaluation.
Operating Principle:
A fluid reservoir is attached to the top of the
tank and is open to the interstice through the bottom. The
intestice is normally filled with a brine solution in freeze
areas or water in non-freeze areas. The fluid reservoir is
equipped with a dual-point level sensor to provide for low
level and high level alarms. The dual-point level sensor system
monitors the liquid level in the interstitial reservoir and
provides an alarm if the liquid level is either too high (ingress
of liquid) or too low (egress of liquid).
Applicability: Containment Solutions, Inc. underground double-walled piping as specified above containing gasoline, gasohol, diesel, heating oil #2, kerosene, aviation fuel, or motor oil. Other liquids may be stored after consultation with the manufacturer.
Test Results:
System is capable of detecting
leaks of 0.1 gph or smaller within one month for all size
tanks manufactured by Containment Solutions, Inc. at time
of evaluation. Estimated time to activate alarm, given a leak
rate of 0.1 gph and assuming initial reservoir is 2 inches
below full, ranges from 4 hours for a 500 gallon tank to 267
hours for a 50,000 gallon tank. Minimum detectable leak for
alarm within one month ranges from 0.0047gph for a 500 gallon
tank to 0.0185 gph for a 50,000 gallon tank, if initial reservoir
level is 50%. Other test results listed below.
Summary of Variable Ranges Measured
in the Evaluation
|
Evaluation variable
|
Range of conditions
|
Estimated
range of effect for gasoline on brine level (in)
|
Product
level change in tank
|
From
0% to 90%
|
2.0
|
Water
table changes
|
48
inches change
|
1.6
|
Temperature
changes
|
From
40 to 100 degrees F.
|
1.8
|
Vapor
trapped in interstice (with temperature change)
|
45
gallons air trapped
(with temperature change from 40 to 100 degrees F.)
|
<2
|
Manufacturer's
Specifications:
Fluid in reservoir
must be filled to proper level.
When alarm condition exists, or annually, sensor must be removed
and tested in a bucket of water, according to manufacturer's
instructions.
Comments:
Evaluation conducted on DWT6 20,000 gallon tank
with a R28 reservoir and FHRB 810 sensor. Other sensors can
be used only if they are a dual-point, will properly fit into
the reservoir, are compatible with the interstitial liquid,
and are on the NWGLDE list.
Evaluation parameters included: tank product level changes,
water table changes, temperature changes, measurement of trapped
vapor in the interstice, leak effects on the liquid-filled
interstice, and scaling factors (application to various tank
sizes).
System was not evaluated for ability to detect layer of hydrocarbon
on water.
Containment Solutions, Inc.
|
Evaluator: Ken Wilcox Associates
|
5150 Jefferson Chemical
|
Tel: (816) 443-2494
|
Conroe, TX 77301-6834
|
Date
of Evaluation: 06/15/98
|
Tel: (800) 628-2657
|
|
Email: dheiman@csiproducts.com |
|
URL: www.containmentsolutions.com |
|
|