Issue Date: May 5, 2021

Dover Fueling Solutions

DFS DX Wetstock SIR V1.0 SIR and V1.2 SIR


Certification Leak rate of 0.1 gph with PD of 99.57 % and PFA 0.43% (V1.0).
Leak rate of 0.2 gph with PD = 99.9998% and PFA = 0.000142% (V1.2).
Leak Threshold 0.05 gph for leak rate of 0.1 gph (V1.0).
0.1 gph for leak rate of 0.2 gph (Version 1.2). 
A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold.
Applicability Gasoline, Diesel & Kerosene.
Tank Capacity The largest single tank size for non-manifolded tank system 31,876 gallons - No larger than 121,343 gallons for single tank.
Maximum tank system size the SIR method may be applied to is 121,343 gallons.
Maximum number of tanks in manifolded tank system can be 3.
Data Requirement
Maximum monthly throughput of 790,575 gallons.
Must be exactly 30 days, no more, no less.
Comments 63% of data sets evaluated were from manifolded tank systems.
Inventory data can be recorded manually or entered by hand into computer.
Conditions where the statistical inventory method is inadequate:
Insufficient or excess number of usable records-(must be 30 days of data)
Irregular time intervals between dipstick reading
Unacceptable daily variability of inventory
Missing data in any field on the required data form
Missing over or short calculation on the form
Data sets evaluated were randomly selected from a database of inventory records maintained by evaluator.
Dispensing meter errors are compensated for.
Calibration errors are compensated for.


Dover Fueling Solutions
c/o Wayne Fueling Systems LLC
3814 Jarret Way t

Evaluator:  Ken Wilcox Associates

Austin, TX 78728

Tel:  (816) 443-2494


Date of Evaluation: September 30, 2020

Phone: +44 (0) 1695 51775  



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