Issue Date: November 19, 2010

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

Model HT-100 Monitoring Method and Line Tightness Test Method Version 2.1

Line Leak Detection Method for Airport Hydrant and Field Constructed Systems


Leak rate of 0.00189% of line capacity (0.00189 gph per 1000 gallons of product) with PD = 95% and PFA = 5% for Version 2.1, (smallest leak rate for this evaluation, which was conducted on a 160,000 gallon line at 150 psi, was 3.03 gph).

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

0.000945% of line volume in gph.
A pipeline system should not be declared tight if the test result indicates a loss that equals or exceeds these thresholds.


Gasoline, diesel, aviation fuel, fuel oil #4, biodiesel B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751.


System tests fiberglass or steel piping.

Pipeline Capacity

Maximum of 320,000 gallons. Minimum of 3,000 gallons.

Waiting Time

None between delivery and testing.
None between dispensing and testing.

Test Period

Minimum 60 minutes after setup.
Test data are acquired and recorded by a microprocessor.
Calculations are automatically performed by the microprocessor.

System Features

System may be permanently installed on pipelines to perform monitoring, or may be transported and set up to perform line tightness testing.
A single 60-minute test is required consisting of a 30-minute monitoring period at operating pressure, and a 30-minute monitoring period at a lower pressure, approximately 30 psi.
System measures change in pressure and reports output quantity in gph, while compensating for thermal effects.
Printed message and alarm activation if leak is declared.


System must be calibrated prior to the initial test in accordance with manufacturer’s instructions.


System is to be used only on large bulk pipelines and airport hydrant fueling systems.


Vista Precision Solutions, Inc.

Evaluator:  Ken Wilcox Associates

2350 Lindberg Loop

Tel:  (816) 443-2494

Richland, WA 99354

Date of Evaluation:  08/25/07

Tel: (509) 943-2484



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