Issue Date: August 23, 1999
Revision Date: December 4, 2002

Vista Precision Solutions, Inc.
(originally listed as Vista Research, Inc.)

Model LT-100a Hourly and Monthly Monitoring Method and Line Tightness Test Method Version 2.0
(Segmented Method)

Line Leak Detection Method for Airport Hydrant and Field Constructed Systems

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.
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 Precision Solutions, Inc.

Evaluator:  Ken Wilcox Associates

2350 Lindberg Loop

Tel:  (816) 443-2494

Richland, WA 99354

Date of Evaluation:  11/06/98

Tel: (509) 943-2484



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