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Issue Date: March 7, 2006
Revision Dates:
February 17, 2011, October 1, 2018
Hansa Consult of
North America, LLC
HCNA Pipeline Leak
Detection System, Version 2.0
Line Leak Detection Method for Airport Hydrant and Field Constructed Systems
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Certification |
Leak rate of 0.002% of line volume (0.02 gph per 1000 gallons
of product) in the pipeline segment being tested with PD > 95% and PFA < 5%.
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Leak Threshold |
0.001% 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, biodiesel B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751.
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Specification |
System tests either single or double-walled fiberglass or
steel piping. |
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Pipeline Capacity |
The Hansa 3rd party certified minimal detectable leak rate for large diameter pipeline systems (airport hydrant systems) is listed in the table below by maximum test section volume.
Leak Detection Rate Per Test Section Volume
(EPA maximum allowable/Hansa 3rd party certified) |
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Test Section Volume
(Gallons) |
EPA Semiannual Test-
Leak Detection Rate Not To Exceed
(Gallons Per Hour) |
EPA Annual Test-
Leak Detection Rate Not To Exceed
(Gallons Per Hour) |
Hansa 3rd party certified minimum detectable leak rate. (Gallons Per Hour) |
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5,000 to 25,000 |
1.0 |
0.5 |
0.5 |
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25,001 to 50,000 |
1.0 |
0.5 |
1.00 |
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50,001 to 75,000 |
1.5 |
0.75 |
1.5 |
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75,001 to 100,000 |
2.0 |
1.0 |
2.00 |
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101,000 to 125,000 |
3.0* |
1.5 |
2.50 |
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125,001 to 150,00 |
3.0* |
1.5 |
3.00 |
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150,001 to 175,00 |
3.0* |
1.5 |
3.50 |
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* EPA semi-annual minimum detectable leak rate may be 6.0 gallons per hour until October 13, 2022 for pipe segments greater than 100,000 gallons. After October 13, 2022, the minimum detectable leak rate cannot exceed 3.0 gallons per hour. |
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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. |
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Calibration |
System must be calibrated in accordance with manufacturer’s
instructions. |
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Comments |
Prior to conducting tests on a line, the HCNA V2.0 must be commissioned to confirm the existing line characteristics for each individual test section.
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.
The third-party evaluations utilized a total of 66 tests. 36 of these tests were conducted with various induced leak rates. 6 of the test were performed at volumes of less than 25,000 gallons. |
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Hansa
Consult of North America, LLC (HCNA)
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Evaluator: Ken
Wilcox Associates
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200
International Drive, Bldg. 120
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Tel: (816)
443-2494
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Portsmouth, NH
03801
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Date of
Evaluation: 12/15/05, 08/28/18
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Tel: (603)
422-8833
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E-mail: koverman@hcna-llc.com |
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