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An ad hoc working group (WG) “AG1” was formed by ISO/TC22/SC34 [1] to conduct the necessary research to mitigate concerns with the prediction of lubricity in paraffinic diesel fuel (e.g., renewable diesel [RD] and gas-to-liquids [GTL] fuel), using ISO 12156-1 [2] high-frequency reciprocating rig (HFRR). Several field complaints had been raised regarding anomalies with HFRR readings of RDs not accurately predicting the lubricity of the fuel. Specific reports include readings below the 460 μm wear scar diameter (WSD) limit may still allow excessive scuffing and wear. Generally, for all fuels, there is a deterioration in precision (measurement error) in the 350 μm-500 μm range. The Paraffinic Diesel Fuel Lubricity AG1 was given the mandate to execute its work tasks comprising the below-listed deliverables while embracing the concept of continuous improvement.

A working group of the International Organization of Standardization (ISO), in cooperation with the Coordinating European Council (CEC), has conducted a round robin test program to compare laboratory bench tests to evaluate the lubricity characteristics of diesel fuels. The goal of the ISO program was to generate sufficient data from these test methods and from fuel injection equipment performance tests to select a test method for determining diesel fuel lubricity. The ISO group also aimed to produce sufficient information to define a minimum lubricity level that would protect fuel delivery system components. Four laboratory test methods were included in the program. These consisted of Falex's Ball on Three Seats (BOTS), Lubrizol's Modified Ball-on-Cylinder Lubricity Evaluator (BOCLE), Paramins' High Frequency Reciprocating Rig (HFRR), and the U.S. Army's Scuffing Load BOCLE.