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UST Program - LG 113

Issue Date: November 19, 2010

Vista Research, Inc.

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

LARGE DIAMETER LINE LEAK DETECTION METHOD (6 Inches Diameter Or Above)

Certification	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.
Applicability	Gasoline, diesel, aviation fuel, fuel oil #4, biodiesel B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751. Pipelines containing other liquids may be tested after approval from the manufacturer.
Specification	System tests fiberglass or steel piping.
Pipeline Capacity	Maximum of 320,000 gallons. Minimum of 3,000 gallons.
Throughput	Monthly maximum of 391,250 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	System may be permanently installed on pipelines to perform monitoring, or may be transported and set up to perform line tightness testing.
Features	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.
Calibration	System must be calibrated prior to the initial test in accordance with manufacturer’s instructions.
Comments	System is to be used only on large bulk pipelines and airport hydrant fueling systems.

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: 08/25/07

Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the performance of the method or equipment. Equipment should be installed and operated in accordance with all applicable laws and regulations. For full details, please refer to our expanded "Disclaimer" page.