Issue Date: January 27, 2011
Revision Date: April 21, 2015

Leak Detection Technologies

Pipeline Hydrostatic Diagnostic Test Method (PHDleak Test)

Line Leak Detection Method for Airport Hydrant and Field Constructed Systems


Leak rate of 0.0017% of pipeline volume (0.000017 gph per gallon of product) in pipeline segment being tested with PD = >95% and PFA = <5%.
The US EPA has not set a minimum detectable leak rate for large diameter pipeline systems (airport hydrant systems) at the time of this evaluation.

Leak Threshold

0.00085% of line volume in gph (0.0000085 gph per gallon of product).

A pipeline system should not be declared tight if the test results indicate a loss that equals or exceeds the preset threshold.


Gasoline, diesel, aviation fuel, fuel oil #4, solvents, waste oil, biodiesel B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751, crude oil, petroleum distillates in liquid form, cooling fluids, and water or water soluble liquids.


System tests either single or double-walled fiberglass or steel piping.

Pipeline Capacity

Minimum of 2,000 gallons, maximum of 1,127,000 gallons.

Waiting Time

None between delivery and testing.

None between dispensing and testing.

Test Period

Minimum of 24 minutes after setup for data collection.

Piping must be isolated and blocked during test.

System Features

System may be permanently installed on pipeline to perform monitoring, or may be transported and set up to perform line tightness testing.

Total minimum time for data collection and analysis is 35 minutes.  System measure change in pressure gradients and reports output quantity in gph, while compensating for thermal and pipeline "creeping" effects.  Pipeline segment being tested must be completely isolated and have pressure control.  Over pressurization is managed utilizing a backup pressure relief valve.


System must be calibrated in accordance with manufacturer's instructions.


System may be used on large underground bulk pipelines such as airport hydrant fueling systems.

Manufacturer claims system is applicable to any size of underground pressurized piping, typically between 2,000 and 1,128,206 gallons.

The third-party evaluation utilized a total of 24 tests.  18 of these tests were conducted with various induced leak rates.


Leak Detection Technologies

Evaluator:  Ken Wilcox Associates

2765 East Wieding Road

Tel:  (816) 443-2494

Tucson, AZ 85706

Date of Evaluation:  01/04/11

Tel: 855-255-5325





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