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Issue Date: May 2, 2000
Revision Date: September 22, 2009
Tanknology
TLD-1 (for
Flexible Pipelines)
LINE TIGHTNESS TEST METHOD
| Certification |
Leak rate of 0.1
gph with PD = 99.7% and PFA = 0.3%. |
| Leak
Threshold |
0.05 gph.
A pipeline system should not be declared tight if the test result
indicates a loss that equals or exceeds this threshold. |
| Applicability |
Gasoline, diesel,
aviation fuel. |
| Specification |
System tests
flexible pipelines.
Tests are conducted at 150% operating pressure.
Mechanical line leak detector must be removed or isolated from pipeline
for duration of test. |
| Pipeline
Capacity |
Maximum of 119.4
gallons. |
| Waiting
Time |
Testing may begin immediately
after system is installed in the line. |
| Test
Period |
Minimum of 30
minutes.
Consistent readings for at least three readings must be obtained for a valid
test.
The actual test time will depend on line size and temperature conditions at
the site.
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
been met.
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. |
| Comments |
Enviroflex
pipeline with a bulk modulus* of 8,359 was used during evaluation.
*See glossary. |
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Tanknology
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Evaluator:
Ken Wilcox Associates
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11000 North MoPac Expressway, Suite 500
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Tel:
(816) 443-2494
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Austin, TX 78759
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Dates of
Evaluations:
04/30/94, 07/24/04
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Tel: (800) 800-4633
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