Issue Date: March 7, 2006

Revision Date:  February 17, 2011

Hansa Consult of North America, LLC

HCNA Pipeline Leak Detection System, Version 2.0

LARGE DIAMETER LINE LEAK DETECTION METHOD (6 inches diameter or above)

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%.
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

0.001% 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.

Applicability

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

Specification

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

Pipeline Capacity

Minimum of 3,000 gallons, maximum of 175,000 gallons.

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.

Calibration

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

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.
The third-party evaluation utilized a total of 60 tests.  30 of these tests were conducted with various induced leak rates.

 

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

Tel: (603) 422-8833

 
E-mail: koverman@hcna-llc.com  
 

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