While an CFR octane engine standardization is dependent solely on TSF blend determinations. The Check Fuels ratings can be done to determine the accuracy of the CFR octane engine.
Perform rating the Check Fuels and compare the octane rating obtained for the Check Fuel to the Check Fuel O.N.ARV.
Specifics for control chart set up and interpretation of the delta between the rating and the ARV value. If an out-of-statistical control situation is detected, examine the engine system operation for assignable cause.
Quality Control (QC Testing):
Users should conduct a regular statistical quality control program to monitor the engine is in statistical control over time. This test method suggests validating the engine system by the rating of a QC sample. The QC sample is a typical spark ignition engine fuel having a research octane number within the normal operating range of the CFR octane engine.
Users are encouraged to assess the normal operating range and determine, if multiple QC samples are required based upon the RON range of the samples typically rated. Use appropriate control charts or other statistically equivalent techniques to assess the RON value. Control charts often used for this application are Individuals and Moving Range (I/MR).
Specifics for control chart set up and interpretation can be found in ASTM D6299 and ASTM D2700 standards. If an out-of-statistical control situation is detected, examine the CFR octane engine operation for assignable cause.