Issue Date: June 19, 1996
Revision Date: December 4, 2002
Line Leak Detection Method for Airport Hydrant and Field Constructed Systems
||Leak rate of 3.0
gph at 10 psi with PD = 100% and PFA = 0%.
The USEPA has not set a minimum detectable leak rate for large diameter
pipeline systems (airport hydrant systems) at the time of this evaluation.
A pipeline system should not be declared tight if the test result
indicates a loss or gain that equals or exceeds this threshold.
aviation fuels, fuel oil #4, waste oil.
pressurized bulk material transfer pipelines.
Suitable for all pressurized steel, plastic, fiberglass, or concrete
System is used as an equivalent 3 gph line leak detector.
Leak detection flow rates are proportional to pressure in pipeline.
Testing is conducted while the product is not flowing in the
Pipeline must be full and under pressure.
Gravity feed pipelines under constant static head pressure may be tested
System tested on 58,115 gallon pipeline.
Use of pipeline test protocol allows system to be used on pipelines twice
the volume of test pipeline.
Contact manufacturer prior to using on pipelines exceeding 58,115 gallons
through 116,230 gallons.
delivery and testing.
None between dispensing and testing.
||Response time is
2 to 5 minutes.
Test data are acquired and recorded by system's computer.
Calculations are automatically performed by system's computer.
installation on pipeline.
Automatic testing of pipeline at least once per hour under static
Continuous operation during flowing conditions (however, thresholds are
higher due to hydraulic noise in pipeline).
Declaration of leak if current changes in pressure exceed tuning
parameters, or if pressure fluctuates in a manner that is characteristic
of a leak. Pump shutdown, indicator light and alarm activation if leak is
||System must be
Standard electronic field instruments used by the system requires normal
annual inspection and calibration checks.
replace a mechanical line leak detector to detect equivalent 3 gph
releases at 10 psi on large pipelines at pressures higher than those found
at typical service station.
Ms. Terri Regan -
Facilities Engineering Service Center