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UST Program - LG 113
Ameron International
Dualoy 3000/LCX and MCX Pipe Monitoring System Liquid FIlled Interstitial Space
CONTINUOUS INTERSTITIAL MONITORING METHOD (LIQUID FILLED)
Certification:
Certified as a continuous, liquid filled interstitial space leak detection system for use only with Ameron Dualoy 3000/LCX and MCX fiberglass double-wall pipe. Applicable liquids include water and aqueous solutions of brine (i.e., CaCl and NaCl) or glycols (e.g., propylene) in concentration sufficient to reduce evaporation and prevent liquid from freezing in any portion of the monitoring system under extremes of local temperature conditions.
Maximum length is 344 feet.
No restrictions on pipeline diameter.
Operating Principle:
Similar to the methodology that has been applied
to liquid filled interstitial double walled tanks.
An applicable liquid solution is used to fill the pipeline interstice.
A vacuum may be placed on the interstice to assist as brine
is filled from the low point in the pipeline to minimize trapped
air.
The reservoir is the high point of the system and is open
or vented at the top and contains a dual-point level sensor.
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).
The method must be used with a dual-point sensor system that
will properly fit into the reservoir, is compatible with the
interstitial liquid, and is on the NWGLDE list. The spacing
between the high and low sensors must be at least 10 inches.
Sensors can be used to shut down the turbine system and/or
alert the operator that a potential problem exists.
Alarm Conditions:
For
a leak rate of 0.10 gph in to or out of the interstice, the
maximum time to alarm for a 10-inch sensor spacing with a
reservoir diameter of 3.33 inches is 3.11 hours.
This method declares a pipeline to be leaking when the loss
or gain of brine in the 3.33 inch reservoir is 0.311 gallons.
The change in level in the reservoir is proportional to the
volume of fluid flowing into or out of the interstice. It
is cumulative and therefore not dependent on the rate of fluid
gain or loss.
Time to alarm is based on evaluations conducted using a 30%
CaCl2 (brine) solution and a leak (liquid egress) 341 feet
from the reservoir.
Time to alarm for a catastrophic primary pipe failure with
a pressure of 38 psi is 8 seconds at a distance of 2.14 feet
from the reservoir and 10.48 minutes at a distance of 341
feet. This is based on a liquid level change of 10" or 0.311
gallons in a reservoir that measures 12 inches in height and
3.33 inches in diameter.
Applicability:
Ameron International 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.
Calibration:
Equipment requires no calibration other than
an annual inspection.
The electronics must be calibrated and maintained in accordance
with the sensor/monitoring equipment instructions.
Comments:
System must be designed and installation done
in accordance with the instructions provided by the manufacturer.
Direct burial of pipeline fittings and reservoir is permitted
provided the reservoir has an observation manway at grade
level.
The liquid level in the reservoir must be at least 12 inches
above the water table.
The interstice must be filled from the low point in the pipeline
to minimize trapped air.
The evaluation was conducted in an Ameron, double-wall, fiberglass
pipeline with an interstitial capacity of 12.97 gallons, an
inside diameter of 2.22 inches, and a length of 344 feet.
The alarm conditions are based on a rise or fall of 10 inches
of applicable liquid in a reservoir that is 3.33 inches in diameter and
12 inches in length.
Installers must be certified by both the piping and sensor
manufacturer.
This method does not meet California's requirements for continuous monitoring of pressurized piping connected to UST systems installed on or after July 1, 2004.
Ameron International |
Evaluator: Texoma Engineering Services, LLC |
1004 Ameron Rd. |
Tel: (940) 761-2284 |
Burkburnett, TX 76354 |
Date of Evaluation: 05/12/05, 05/01/07, 11/13/09 |
Tel: (940) 569-1471 |
Evaluator: Ken Wilcox Associates |
Email: marcom@ameronfpd.com | Tel: (816) 443-2494 |
URL: www.ameronfpd.com | Date of Evaluation: 11/08/09 |
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