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Issue Date: November 22,
1995
Revision Date: November 21, 2003
Veeder-Root
(originally listed as Entropy Limited)
Precision
Tank Inventory Control System, Revision 90
STATISTICAL
INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)
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Certification
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Leak
rate of 0.1 gph with PD = 99.5% and PFA < 0.5%.
"If a method meets the requirement for detecting
a leak rate of 0.1 gph, it will meet the requirement for
0.2 gph.", according to "Standard Test Procedures
for Evaluating Leak Detection Methods:
Statistical Inventory Reconciliation Methods", EPA/530/UST-90/007,
June 1990, Section 7.2.3, page 30.
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Leak
Threshold
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If
the absolute value of the calculated leak rate (gain or
loss) is less than the leak threshold and the minimum
detectable leak rate is less than or equal to 0.1 gph
(0.2 gph for the 0.2 gph test), the test result is "pass."
If the absolute value of the calculated leak rate is greater
than or equal to the leak threshold, the result is "fail."
If the minimum detectable leak rate exceeds 0.1 gph (0.2
gph for the 0.2 gph test) and the absolute value of the
calculated leak rate is less than the leak threshold,
the test result is "inconclusive."
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Applicability
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Gasoline,
diesel.
Other more viscous liquids may be tested after consultation
with the vendor.
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Tank
Capacity
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Maximum
of 22,500 gallons for single tanks.
Maximum of 60,000 gallons cumulative capacity for manifolded
tank systems with no more than 3 tanks in system.
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Data
Requirement
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Minimum
of 30 days of product level and flow through data.
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Comments
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32%
of data sets evaluated were from manifolded tank systems.
Of 56 data sets submitted for evaluation, 6 were not analyzed
due to unusable data and none were inconclusive.
Median monthly throughput of tanks evaluated was 52,207
gallons.
Leak rates ranging from 0.0497 to 0.203 gph were used
in evaluation.
Data sets evaluated were supplied by evaluator.
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Gilbarco/Veeder Root
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Evaluator: Simpson, Gumpertz and Heger,
Inc.
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Attn: CMS Mailstop F-76
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Tel: (617) 643-2000
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7300 West Friendly Ave.
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Date of Evaluation: 11/30/93
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| P.O. Box 22087
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| Greensboro, NC 27420-2087
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Tel: (800) 253-8054
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