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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
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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
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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
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Gasoline, diesel, aviation fuel, biodiesel blends B6-B20 meeting ASTM D7467, biodiesel B100 meeting ASTM D6751*.
Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer.
*NWGLDE Listings apply to leak detection functionality only and not material compatibility - see "Disclaimer".
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Tank
Capacity
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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
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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
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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
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Average
for product is determined by a minimum of 5 thermistors.
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Water
Sensor
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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
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Thermistors
and probe must be checked and, if necessary, calibrated
in accordance with manufacturer's instructions.
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Comments
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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.
California regulations
require at least one test per month after routine product
delivery or when the tank is filled to within 10% of
the highest operating level of previous month. If the 0.1 gph test is used as a tank tightness test there must be no water present in the backfill (groundwater must be below the bottom of the tank), the tank must be equipped with an overfill protection device, and the product level in the tank must be at the overfill protection device set point. Local agency pre-approval is required. To use the 0.1 gph test as a monthly option see title 23 CCR Section 2643 (b)(2).
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Veeder-Root
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Evaluator:
Midwest Research Institute
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125
Powder Forest Dr.
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Tel:
(816) 753-7600
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Simsbury,
CT 06070-2003
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Date
of Evaluation: 05/14/93
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Tel:
(860) 651-2700
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