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


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%.

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.


Gasoline, diesel, aviation fuel, fuel oil #4, solvents, waste oil, biodiesel B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751.


System tests either single or double-walled fiberglass or steel piping.

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)


Test Section Volume

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)


5,000 to 25,000





25,001 to 50,000





50,001 to 75,000





75,001 to 100,000





101,000 to 125,000





125,001 to 150,00





150,001 to 175,00





* 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.


Waiting Time

None between delivery and testing.
None between dispensing and testing.

Test Period

Minimum of 45 minutes after setup.
Piping must be isolated and blocked during test.

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.


System must be calibrated in accordance with manufacturer’s instructions.


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.


Hansa Consult of North America, LLC (HCNA)

Evaluator:  Ken Wilcox Associates

200 International Drive, Bldg. 120

Tel:  (816) 443-2494

Portsmouth, NH 03801

Date of Evaluation: 12/15/05, 08/28/18

Tel: (603) 422-8833


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