Abstract

The requirement to minimize flange face corrosion, overcome handling problems and improve sealing performance has led to the evolution of a new type of gasket for use in Hydrofluoric (HF) Alkylation Units to replace the standard spiral-wound type. The carbon steel flange face can now be protected from aggressive HF acid corrosion and the resulting iron fluoride scaling, accompanied by an increase in both the reliability and sealability of the flange joints. The benefits include a reduction of costly flange damage, potential leakage and the associated unit shutdowns required for repairs. This feature highlights the stages in the development of the new gasket design.

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