Issue Date: February 17, 2011


Hansa Consult of North America LLC

HCNA Pipeline Leak Detection System, Version 2.1

Line Leak Detection Method for Airport Hydrant and Field Constructed Systems


Leak rate of 0.068 gph 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.

Leak Threshold

0.034 gph. 
A pipeline system should not be declared tight if the test result indicates a loss that equals or exceeds this threshold.


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


System tests single or double walled fiberglass, steel and flexible pipelines.

Wet tests are conducted at 30 to 150 psi or 150% of operating pressure.

Pipeline Capacity

Maximum of 5,000 gallons. 

Waiting Time

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

Test Period

Under ideal conditions, 45 minutes after installing in blocked line section.

Test data is collected continuously and recorded by computer.

System Features

System may be permanently installed on pipeline to perform routine 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 oeprating 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.


No temperature sensors used.

System must be calibrated in accordance with manufacturers instructions.

Comments The initial third-party evaluation utilized a total of 60 tests.  30 of these tests were conducted with various induced leak rates.  An additional review of 87 tests on smaller lines was conducted at 15 sites and comprised 58 sections.  11 of these tests were simulated leak tests.  This review is limited to lines less than 5,000 gallons.  Pressure changes are converted to volume changes using commissioning data.


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:  05/24/10

Tel:  (603) 422-8833



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