Issue Date: August 23, 1999
Revision Date: December 4, 2002
Vista Research, Inc.
Model LT-100a Hourly and Monthly Monitoring Method and Line Tightness Test Method Version 2.0
(Segmented Method)
Large Diameter Line Leak Detection Method (6 Inches Diameter or Above)
| Certification | Leak rate of 3.0 gph with PD = 95% and PFA < 0.1% for Hourly Monitoring Method. Leak rate of 0.2 gph with PD = 95% and PFA = 2.9% for Monthly Monitoring Method. 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 | 2.936 gph for leak rate of 3.0 gph. 0.136 gph for leak rate of 0.2 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. Other liquids may be tested after consultation with the manufacturer. |
| Specification | System tests fiberglass or steel piping. Tests are conducted at operating pressure to a maximum of 200 psi. |
| Pipeline Capacity | Maximum of 3,400 gallons. |
| Waiting Time | None between delivery and testing. None between dispensing and testing. |
| Test Period | Minimum of 15 minutes after setup and after pipeline is fully isolated. Test data are acquired and recorded by a microprocessor. Calculations are automatically performed by the microprocessor. |
| System Features | System may be permanently installed on pipeline to perform hourly monitoring or monthly monitoring, or may be transported and set up to perform line tightness testing. A single 15-minute test is required consisting of two 3-minute monitoring segments at atmospheric pressure spaced 0 minutes apart, and two 3-minute monitoring segments at operating pressure spaced 0 minutes apart. Discrete test methods. Preset threshold. Printed message and alarm activation if leak is declared. |
| Calibration | System must be calibrated in accordance with manufacturer's instructions during system setup. |
- Vista Research, Inc.
755 North Mary Ave.
Sunnyvale, CA 94085
Tel: (408) 830-3300 - Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 11/06/98
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