Process for preparing a halogenated precursor of an alkenone, which comprises reacting a carboxylic acid halide with a vinyl ether in a liquid reaction medium using an equipment having at least one surface in contact with the liquid reaction medium, wherein said surface consists of a material selected from glass, polytetrafluoroethylene and nickel based metal alloy. The hierarchical multi-stage model considers heterogeneity of failure patterns for the assets. The first stage float member at least partially overlaps over the second stage float member.