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Issue Date: November 22, 1995
Revision Date: March 1, 2011
Veeder-Root
TLS-200, 200i,
250i, 300, 300C, 300i, 300PC, 350, 350PC, 350R, 350RPC, 350Plus,
Red Jacket ProMax and ProPlus UST ATGS
(Model 8472 Digital Sensing Capacitance Probe)
AUTOMATIC TANK GAUGING METHOD
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Certification |
Leak rate of 0.2
gph with PD = 99% and PFA = 0.2%.
Leak rate of 0.1 gph with PD = 99% and PFA = 0.1%. |
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Leak Threshold |
0.126 gph for
leak rate of 0.2 gph.
0.071 gph for leak rate of 0.1 gph.
A tank system should not be declared tight if the test result indicates a
loss or gain that equals or exceeds this threshold. |
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Applicability |
Gasoline, diesel,
aviation fuel, biodiesel blends B6-B20 meeting ASTM D7467, biodiesel B100
meeting ASTM D6751. |
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Tank Capacity |
Maximum of 15,000
gallons.
Tank must be between 50 and 95% full for leak rate of 0.2 gph.
Tank must be minimum 95% full for leak rate of 0.1 gph.
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Waiting Time |
Minimum of 8
hours, 18 minutes between delivery and testing for leak rate of 0.2 gph.
There must be no dispensing or delivery during waiting time for leak rate of
0.2 gph.
Minimum of 8 hours, 15 minutes between delivery and testing for leak rate of
0.1 gph.
Minimum of 30 minutes between dispensing and testing for leak rate of 0.1
gph.
There must be no delivery during waiting time for leak rate of 0.1 gph.
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Test Period |
Minimum of 2
hours.
Test data are acquired and recorded by system’s computer.
Leak rate is calculated from the difference between the first and last data
collected.
There must be no dispensing or delivery during test. |
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Temperature |
Average for
product is determined by a minimum of 5 thermistors. |
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Water Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 1.52 inches.
Minimum detectable change in water level is 0.027 inch.
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Calibration |
Thermistors and
probe must be checked and, if necessary, calibrated in accordance with
manufacturer's instructions. |
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Comments |
Not evaluated
using manifolded tank systems. Therefore, this certification is only
applicable when there is a probe used in each tank and the siphon is broken
during testing.
Tests only portion of tank containing product.
As product level is lowered, leak rate in a leaking tank decreases (due to
lower head pressure).
Consistent testing at low levels could allow a leak to remain undetected.
EPA leak detection regulations require testing of the portion of the tank
system which routinely contains product.
Capacitance probes do not work with oxygenated fuels. |
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Veeder-Root |
Evaluator: Midwest Research
Institute |
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125 Powder Forest Dr. |
Tel: (816) 753-7600 |
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Simsbury, CT 06070-2003 |
Date of Evaluation: 05/14/93 |
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Tel: (860) 651-2700 |
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E-mail:
info@veeder.com |
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URL:
www.veeder.com |
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