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Issue
Date: September 11, 1998
Revision Date: March 1, 2011
Veeder-Root
TLS-250,
250i, 300, 300C, 300i, 300PC, 350, 350PC, 350R, 350RPC, 350Plus, 450,
Red Jacket ProMax and ProPlus UST ATGS
(Models 8473, 8493 Magnetostrictive Probes)
AUTOMATIC
TANK GAUGING METHOD
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Certification
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Leak
rate of 0.2 gph with PD = 98.9% and PFA = 0.3%.
Leak rate of 0.1 gph with PD = 95.8% and PFA = 0.9%.
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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.
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".
For other tank diameters, see evaluation report.
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Waiting
Time
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Minimum
of 8 hours between delivery and testing. Minimum of 30
minutes between dispensing and testing.
There must be no delivery during waiting time.
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Test
Period
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Minimum
of 2 hours for leak rate of 0.2 gph.
Minimum of 3 hours for leak rate of 0.1 gph.
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 probe which contains 5 thermistors.
At least one thermistor must be submerged in product during
test.
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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 0.544 inch.
System is programmed to report water depth only when it
exceeds 0.75 inch.
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 which routinely
contains product.
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
125
Powder Forest Dr.
Simsbury,
CT 06070-7684
Tel:
(860) 651-2700
E-mail: dhalla@veeder.com
URL: www.veeder.com |
Evaluator:
Midwest Research Institute
Tel:
(816) 753-7600
Date
of Evaluation: 09/04/97, 07/01/98
Evaluator: Ken Wilcox Associates
Tel: (816) 443-2494
Date of Evaluation: 02/29/08
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