ASTM D613-26 Standard Test Method for Cetane Number of Diesel Fuel Oil

This standard establishes a test method for determining the cetane number of diesel fuel oil using a standardized single-cylinder, four-stroke-cycle, variable-compression-ratio diesel engine.

ASTM D613-26 provides procedures for determining the cetane number of diesel fuel oil by comparing its ignition characteristics with reference fuels in a standardized compression-ignition test engine. The standard covers terminology, referenced documents, test equipment, instrumentation, reference fuels, sampling, engine settings, operating conditions, engine qualification, and rating procedures. It supports fuel quality evaluation by engine manufacturers, petroleum refiners, fuel marketers, laboratories, and commercial testing organizations, and may also be applied to unconventional fuels such as synthetic fuels and vegetable oils, subject to the limitations described in the standard.

Application Scope: Diesel fuel cetane rating, petroleum laboratories, fuel quality control, engine and fuel compatibility assessment, refinery and fuel marketing testing, and standardized combustion performance evaluation.