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Issue Date: August 23, 1999
Revision Date: April 8, 2008
Veeder-Root
TLS-300, 350, 350R, 350Plus,
450, TLS2, Red Jacket ProMax and ProPlus
(Models 8463, 8473, 8493 Magnetostrictive Probes)
AUTOMATIC TANK GAUGING METHOD
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Certification |
Leak rate of 0.2
gph with PD = 99.5% and PFA = 1.6% for 2 hour test.
Leak rate of 0.1 gph with PD = 96.0% and PFA = 3.4% for 5 hour test.
Leak rate of 0.1 gph with PD = 96.2% and PFA = 2.2% for 4 hour test.
Leak rate of 0.1 gph with PD = 96.4% and PFA = 1.5% for 3 hour test.
Leak rate of 0.1 gph with PD = 97.3% and PFA = 2.3% for 2 hour test.
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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.
Other liquids with known coefficients of expansion and density may be tested
after consultation with the manufacturer. |
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Tank Capacity |
Maximum of 20,000
gallons.
Tanks less than 95% full may be tested. Minimum product level required is
based on tank diameter as follows:
48" dia/min 18";
64" dia/min 21";
72" dia/min 24";
96" dia/min 30";
126" dia/min 39";
132" dia/min 39".
For other tank diameters, see evaluation report. |
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Waiting Time |
Minimum of 8
hours between delivery and testing for 2 hour test and leak rate of 0.2 gph.
Minimum of 8 hours between delivery and testing for 5 hour test and leak
rate of 0.1 gph.
Minimum of 9 hours between delivery and testing for 4 hour test and leak
rate of 0.1 gph.
Minimum of 10 hours between delivery and testing for 3 hour test and leak
rate of 0.1 gph.
Minimum of 11 hours between delivery and testing for 2 hour test and leak
rate of 0.1 gph.
Minimum of 30 minutes between dispensing and testing.
There must be no delivery during waiting time. |
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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 probe which contains 5 thermistors.
At least two thermistors must be submerged in product during test.
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Water Sensor |
Must be used to
detect water ingress.
Minimum detectable water level in the tank is 0.66 inch.
System is programmed to report water depth only when it exceeds 0.75 inch.
Minimum detectable change in water level is 0.005 inch for leak rate of 0.2
gph.
Minimum detectable change in water level is 0.027 inch for leak rate of 0.1
gph. |
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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
which routinely contains product. |
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Veeder-Root |
Evaluator: Ken Wilcox Associates |
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125
Powder Forest Dr. |
Tel:
(816) 443-2494 |
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Simsbury, CT 06070-2003 |
Dates of
Evaluations: 06/29/98 (Rev. 04/17/02), 02/29/08 |
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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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