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Issue Date: February 17, 2011
Hansa Consult of North America LLC
HCNA Pipeline Leak Detection
System, Version 2.1
LINE TIGHTNESS TEST METHOD
| Certification |
Leak rate of 0.068
gph with PD = 95.0% and PFA = 5%. |
| Leak
Threshold |
0.034 gph.
A pipeline system should not be declared tight if the test results
indicate 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 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 |
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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