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Issue Date: December 4, 2002
Revision
Date: March 7, 2006
HansaConsult Ingenieurgesellschaft mbH
HansaConsult Pressure-Step Tightness Control System (TCS)
Pipeline Leak Detection System
Line Leak Detection Method for Airport Hydrant and Field Constructed Systems
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Certification |
Leak
rate of 0.004% of line volume (0.004 gph per gallon of product) in the
pipeline segment being tested with PD > 95% and PFA < 5%.
The USEPA has not set a minimum detectable leak rate for large diameter
pipeline systems (airport hydrant systems) at the time of this evaluation.
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Leak Threshold |
0.002% of line volume in gph.
A pipeline system should not be declared tight if the test results indicate
a loss that equals or exceeds the threshold. |
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Applicability |
Gasoline, diesel, aviation fuel, fuel oil #4, solvents, waste oil.
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Specification |
System tests either single or double-walled fiberglass or steel piping.
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Pipeline Capacity |
Minimum of 22,700 gallons, maximum of 175,110 gallons (range of pipelines
evaluated). |
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Waiting Time |
None
between delivery and testing.
None between dispensing and testing. |
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Test Period |
Minimum of 45 minutes after setup.
Piping must be isolated and blocked during test. |
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System Features |
System may be permanently installed on pipeline to perform monitoring, or
may be transported and set up to perform line tightness testing.
A single 45 minute test is required to simultaneously test as many sections
as required consisting of typically two 15-minute monitoring periods at
operating pressure, and one 15-minute monitoring period at a lower pressure
level.
System measures change in pressure gradients and reports output quantity in
gph, while compensating for thermal and pipeline “creeping” effects.
If leak is declared, message is printed and alarm is automatically activated
immediately after completion of test.
Pipeline segment being tested must be completely isolated and have pressure
controlled and maintained using a pressure relief valve. |
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Calibration |
System must be calibrated in accordance with manufacturer’s instructions.
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Comments |
System may be used on large underground bulk pipelines such as airport
hydrant fueling systems.
Manufacturer claims system is applicable to any size of underground
pressurized piping, typically between 3,000 and 500,000 gallons, especially
underground pipelines and airport hydrant fueling systems.
The third-party evaluation utilized a total of 306 tests, 16 of these tests
were conducted on two lines with various induced leak rates. |
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HC Fuel Systems LLC |
Evaluator: Ken Wilcox Associates |
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P.O. Box 826 |
Tel:
(816) 443-2494 |
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176
Places Mill Road |
Date of
Evaluation: 08/11/00 |
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Alton, NH 03809 |
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Tel: (603) 879-0388 |
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E-mail: jbirnie@hansaconsult.com |
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URL: www.hansaconsult.com |
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