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Certification
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Leak
rate of 0.004% of line volume (0.04 gph per 1000 gallons
of product) in the pipeline segment being tested with
PD > 95% and PFA < 5%.
The USEPA has not set a minimum detectable leak
rate for large diameter pipeline systems (airport hydrant
systems) at the time of this evaluation.
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Leak
Threshold
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0.002% of line volume in gph.
A pipeline system should not be declared tight if the
test results indicate a loss that equals or exceeds the
threshold.
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Applicability
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Gasoline, diesel, aviation fuel, fuel oil #4, solvents,
waste oil.
Other liquids may be tested after consultation with the
manufacturer.
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Specification
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System tests either single or double walled fiberglass
or steel piping.
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Pipeline
Capacity
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Minimum
of 22,700 gallons, maximum of 175,110 gallons (range of
pipelines evaluated).
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Waiting
Time
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None
between delivery and testing.
None between dispensing and testing.
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Test
Period
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Minimum of 45 minutes after setup.
Piping must be isolated and blocked during test.
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System
Features
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System may be permanently installed on pipeline to perform
monitoring, or may be transported and set up to perform
line tightness testing.
A single 45 minute test is required to simultaneously
test as many sections as required consisting of typically
two 15-minute monitoring periods at operating pressure,
and one 15-minute monitoring period at a lower pressure
level.
System measures change in pressure gradients and reports
output quantity in gph, while compensating for thermal
and pipeline “creeping” effects.If leak is declared, message
is printed and alarm is automatically activated immediately
after completion of test.
Pipeline segment being tested must be completely isolated
and have pressure controlled and maintained using a pressure
relief valve.
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Calibration
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System must be calibrated in accordance with manufacturer's
instructions.
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Comments
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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 3,000
and 500,000 gallons, especially underground pipelines
and airport hydrant fueling systems.
The third-party evaluation utilized a total of 306 tests.
16 of these tests were conducted on two lines with various
induced leak rates.
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