Issue Date: February 17, 2011
Hansa Consult of North America, LLC
HCNA Pipeline Leak Detection System, Version 2.1
Large Diameter Line Leak Detection Method (6 Inches Diameter or Above)
| 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 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 D7647, biodiesel B100 meeting ASTM D6751*. Pipelines containing other liquids may be tested after approval from the manufacturer. *NWGLDE listings apply to leak detection functionality only and not material compatibility - see Disclaimer. |
| 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. |
- Hansa Consult of NorthAmerican, LLC (HCNA)
200 International Drive, Bldg. 120
Portsmouth, NH 03801
Tel: (603) 422-8833
Email: koverman@hcna-llc.com - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 05/24/10
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