Issue Date: May 2, 2000
Revision Date: May 15, 2008
Tanknology - NDE
TLD-1 (for Flexible Pipelines)
Line Tightness Test Method
| Certification | Leak rate of 0.1 gph with PD = 99.7% and PFA = 0.3%. |
|---|---|
| Leak Threshold | 0.05 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. |
| Specification | System tests flexible pipelines. Tests are conducted at 150% operating pressure. Mechanical line leak detector must be removed or isolated from pipeline for duration of test. |
| Pipeline Capacity | Maximum of 119.4 gallons. |
| Waiting Time | Testing may begin immediately after system is installed in the line. |
| Test Period | Minimum of 30 minutes. Consistent readings for at least three readings must be obtained for a valid test. The actual test time will depend on line size and temperature conditions at the site. The data from this evaluation suggests that the actual minimum test time is 50 minutes for a line of this capacity. Test may not be ended until pass/fail criteria set by manufacturer has been met. Pipe deflection, vapor pockets, and large temperature differences may produce inconsistent readings. Testing must continue until stable conditions are present. Test data are acquired and recorded manually. |
| Comments | Enviroflex pipeline with a bulk modulus* of 8,359 was used during evaluation.
*See glossary. |
- Tanknology - NDE
8900 Shoal Creek Blvd., Building 200
Austin, TX 78757
Tel: (800) 800-4633 - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 04/30/94 , 07/22/07
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