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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
| Certification |
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. |
| 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 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. |
| Calibration |
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. |
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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 |
Tel: (816) 443-2494
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Portsmouth, NH 03801
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Date of Evaluation: 05/24/10 |
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Tel:
(603) 422-8833
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E-mail: koverman@hcna-llc.com |
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