Introduction

The purpose of this International Standard is to accord ISO status to a test procedure that is already used in a standardized form all over the world. The procedure in question is published by ASTM International as Standard Test Method D 2699-12.

By publishing this International Standard, ISO recognizes that this method is used in its original text in many member countries and that the standard equipment and many of the accessories and materials required for the method are obtainable only from specific manufacturers or suppliers. To carry out the procedure in every detail requires reference to annexes and appendices of ASTM D 2699‑12. The annexes detail the specific equipment and instrumentation required, the critical component settings and adjustments, and include the working tables of referenced settings. The appendices provide background and additional insight about auxiliary equipment, operational techniques and the concepts relative to proper maintenance of the engine and instrumentation items.

The accumulated motor fuel data relating to knock characteristics determined in many countries has, for many years, been based on the use of the CFR engine and the ASTM octane test methods. Accepted worldwide, petroleum industry octane number requirements for motor fuels are defined by the research method and associated CFR F-1 Octane Rating Unit1, which emphasizes the need for this method and test equipment to be standardized. The initiation of studies to use a different engine for ISO purposes has therefore been considered an unnecessary duplication of effort.

For these reasons, it has been considered desirable by ISO Technical Committee 28, Petroleum products and lubricants, to adopt the ASTM D 2699 standard procedures. However, this International Standard refers to annexes and appendices of ASTM D 2699 without change because of their extensive detail. These annexes and appendices are not included in this International Standard because they are available from ASTM International.

Due to identified component obsolescence issues, the original, analogue control panel has been replaced by the manufacturer by new digital panel as of 2011. Service parts availability for the analogue system will be phased out in the future. Research work was executed by ASTM International^[⁵^] to check whether there was statistically observable systemic bias between the 501C and the new digital knock measurement system.

With respect to precision ISO and ASTM technical committees concluded that there was numerically comparable precision for repeatability between the 501C and new panel knock measurement systems, and no statistically observable difference for reproducibility between the 501C and new panel knock measurement systems. This means that the new CFR octane panel could be included in the test method.

BS EN ISO 5164:2014

Petroleum products. Determination of knock characteristics of motor fuels. Research method

Current

Published:

30 Sep 2014