UST Programs - LG 113

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.	Evaluator: Ken Wilcox Associates
755 North Mary Ave.	Tel: (816) 443-2494
Sunnyvale, CA 94085	Date of Evaluation: 11/06/98
Tel: (408) 830-3300

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