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UST Program - LG 113

UST Programs - LG 113

Issue Date: April 18, 1997
Revision Date: December 4, 2002


Vista Research, Inc.

Model LT-100 Monthly Monitoring Method and Line Tightness Test Method Version 1.0 (Manual Method)


Certification Leak rate of 0.2 gph with PD = 96% and PFA < 4%.
Leak rate of 0.1 gph with PD = 96% and PFA = 4%.
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 0.177 gph for leak rate of 0.2 gph.
0.077 gph for leak rate of 0.1 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 2 hours after setup and after pipeline is fully isolated.
Test data are acquired and recorded manually. Calculations are performed by tester.
System Features System may be permanently installed on pipeline to perform monthly monitoring or line tightness testing, or may be transported and set up to perform line tightness testing.
A single 2-hour test is required consisting of a 1-hour monitoring period at operating pressure and a 1-hour monitoring period at atmospheric pressure.
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:  04/15/96

Tel: (408) 830-3300


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