Issue Date: May 2, 2000
Revision Date: September 22, 2009
LINE TIGHTNESS TEST METHOD
||Leak rate of 0.1
gph with PD = 99.7% and PFA = 0.3%.
A pipeline system should not be declared tight if the test result
indicates a loss that equals or exceeds this threshold.
Tests are conducted at 150% operating pressure.
Mechanical line leak detector must be removed or isolated from pipeline
for duration of test.
||Maximum of 119.4
||Testing may begin immediately
after system is installed in the line.
||Minimum of 30
Consistent readings for at least three readings must be obtained for a valid
The actual test time will depend on line size and temperature conditions at
The data from this evaluation suggests that the actual minimum test time is
50 minutes for a line of this capacity.
Test may not be ended until pass/fail criteria set by manufacturer has
Pipe deflection, vapor pockets, and large temperature differences may
produce inconsistent readings.
Testing must continue until stable conditions are present.
Test data are acquired and recorded manually.
pipeline with a bulk modulus* of 8,359 was used during evaluation.
Ken Wilcox Associates
11000 North MoPac Expressway, Suite 500
Austin, TX 78759
Tel: (800) 800-4633