Issue Date: November 22, 1995
Revision Date: May 3, 2002
Tanknology - NDE
TLD-1
Line Tightness Test Method
| Certification | Leak rate of 0.1 gph with PD = 99.5% and PFA = 0.5%. |
|---|---|
| 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 fiberglass and steel pipelines. Tests are conducted at 150% operating pressure. Mechanical line leak detector must be removed or manually isolated from pipeline for duration of test, or check valve in pump must be manually closed if testing is to be conducted with mechanical line leak detector in place. |
| Pipeline Capacity | Maximum of 172 gallons. |
| Waiting Time | Testing may begin immediately after system is installed in the line. |
| Test Period | Response time is 30 minutes to 6 hours. 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. |
- 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: 12/29/91, 03/04/02
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