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Issue
Date: November 22, 1995
Revision Date: June 5, 2002
SIR
International, Inc.
Mitchell's
SIR Program Versions 2.6, 2.7
STATISTICAL
INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)
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Certification
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Leak
rate of 0.2 gph with PD = 99% and PFA = 1% (Version 2.7).
Leak rate of 0.1 gph with PD = 99% and PFA = 1% (Version
2.6).
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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 0.2 gph
(0.1 gph for the 0.1 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 0.2 gph (0.1
gph for the 0.1 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 45,000 gallons for single tanks.
Maximum of 45,000 gallons cumulative capacity for manifolded
tank systems with no more than 4 tanks in system.
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Data
Requirement
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Minimum
of 23 days of product level and flow through data.
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Comments
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68%
of data sets evaluated were from manifolded tank systems.
Of 41 data sets submitted for evaluation, all were analyzed
with conclusive results.
Median monthly throughput of tanks evaluated was 22,370
gallons.
Leak rates of 0.05, 0.1, and 0.2 gph were used in evaluation.
Data sets used in this evaluation were supplied by evaluator.
100% of inventory data used in this evaluation were gauge
stick readings.
Gains (water ingress) are analyzed and evaluated on an
individual basis.
The same data sets were used for both the 1995 and 1997
evaluations.
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SIR
International, Inc.
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Evaluator:
Ken Wilcox Associates
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P.O.
Box 700
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Tel: (816) 443-2494
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Locust
Grove, OK 74352
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Dates
of Evaluation: 01/27/92, 06/8/95, 07/27/97
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Tel: (918) 479-5800
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Tel:
(800) 793-1919
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