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Issue Date: November 7, 2001
Revision Date: February 22, 2017
TotalSIR
TotalSIR
Version 1.0
STATISTICAL
INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)
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Certification
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Leak
rate of 0.2 gph with PD > 99.9% and PFA < 0.1% for
leak threshold of 0.1 gph.
Leak rate of 0.2 gph with PD > 97.2% and PFA < 0.1%
for leak threshold of 0.16 gph.
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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,
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 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, kerosene.
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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| System
Features |
Method
of data analysis that system employs, and was used during
evaluation process, is exclusive of any external control
by vendor.
System consists of a fully automated software package
with embedded algorithms for conducting leak detection
testing. Consequently, third party evaluation procedure
demonstrated that system can be used in-house with no
requirement for direct vendor participation. |
| Evaluation
Features |
This
system was tested for in-house use.
Vendor, with evaluator present, analyzed required data
and performed evaluation using program disk only.
Results were presented to evaluator directly from the
computer without additional vendor involvement. |
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Comments
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Gains
(water ingress) are investigated using current and previous
month raw inventory data.
73% of data sets were from manifolded tank systems.
Of 41 data sets submitted for evaluation, 4 were inconclusive.
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 evaluated were supplied by evaluator.
The listed method certified with a detectable leak rate of 0.2 gallons per hour and a leak threshold of 0.16 gallons per hour does not meet the Federal UST requirement for Statistical Inventory Reconciliation to use a threshold that does not exceed one-half the minimum detectable leak rate. (40 Code of Federal Regulations, part 280, subpart 43, subdivision (h), paragraph (3).)
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TotalSIR
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Evaluator: Ken Wilcox Associates
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P.O. Box 2040
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Tel: (816) 443-2494
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Cornelius, NC 28031
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Date of Evaluation: 04/07/93, 07/18/95, 06/16/00, 08/27/01
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Tel: (704) 892-9941
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