Issue Date: June 21, 2013

ATMOS International

ATMOS STMS Statistical Tightness Monitoring System for Airports

Line Leak Detection Method for Airport Hydrant and Field Constructed Systems


Leak rate of 0.0019% of pipeline volume (0.000019 gph per gallon of product) at a defined pressure of 150 psi 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

0.00095% of pipeline volume (0.0000095 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 300,000 gallons.

Waiting Time

None between delivery and testing.

None between dispensing and testing.

Test Period

Minimum of 45 minutes after setup for data collection.

Piping must be isolated and blocked during test.

System Features

System is permanently installed on pipeline to perform monitoring.

Average test time for data collection and analysis is 65 minutes.  System performance is expressed as a percentage of the piping volume per hour.


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


System designed for use 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 300,000 gallons.

The size of the detectable leak scales upward with the size of the piping system.

The third-party evaluation utilized a total of 24 tests.  16 of these tests were conducted with various induced leak rates.


ATMOS International

Evaluator:  Ken Wilcox Associates

3100 East Miraloma Avenue, Suite 240D

Tel:  (816) 443-2494

Anaheim, CA  92806

Date of Evaluation:  06/30/08

Tel:  (714) 520-5325





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