Issue Date: November 22, 1995
Revision Date: March 26, 2009

SIR International, Inc.

Mitchell's SIR Program Versions 2.6, 2.7

STATISTICAL INVENTORY RECONCILIATION TEST METHOD (QUANTITATIVE)

Certification 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).
Leak Threshold 0.10 gph for a leak rate of 0.2 gph (Version 2.7).
0.05 gph for a leak rate of 0.1 gph (Version 2.6).
These leak thresholds are for evaluation purposes only. 
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds the leak threshold calculated from the data set. This leak threshold may be different than the above leak thresholds.
Applicability Gasoline, diesel. 
Tank Capacity 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.
Data Requirement Minimum of 23 days of product level and flow through data.
Comments 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.

 

SIR International, Inc.

Evaluator:  Ken Wilcox Associates

P.O. Box 1740

Tel:  (816) 443-2494

Canyon Lake, TX 78133

Dates of Evaluation:  01/27/92, 06/8/95, 07/27/97

Tel:  (800) 793-1919

 

Tel:  (830) 899-7565  
Fax: (830) 899-7566  
sir@gvtc.com  
 

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