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03651 Specification for Carbon Steel Materials for Hydrofluoric Acid Alkylation Units

 Joint Industry Project “Materials Specification for HF Alkylation Plant” to develop test and corrosion rate measurement procedures for materials in HF environments and to develop a carbon steel materials specification w.r.t levels of residual elements and carbon in steels for HF alkylation equipment.

Product Number: 51300-03651-SG
ISBN: 03651 2003 CP
Author: Andy Gysbers, Hisham Hashim, Dannie Clarida, Gregmar Chirinos, Dr. John Marsh, Dr. Jim Palmer
Publication Date: 2003
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Operation of hydrofluoric (HF) acid alkylation units using primarily carbon steel construction material has been the norm for over 60 years. There have been few problems associated with the use of this material for many years. There have been problems reported within the last 10 years where a nonuniform corrosion phenomenon occurs leading to plant incidents. Residual elements (RE), Cr, Ni and Cu in carbon steel were implicated as a potential cause for this problem. There were inconsistencies though claimed by others or within differing parts of the plant about this RE effect. Galvanic effects were reported that might negate the possible beneficial use of low RE materials. This paper reports the key results of the Joint Industry Project “Materials Specification for HF Alkylation Plant” whose primary objectives were to develop test and corrosion rate measurement procedures for evaluating materials in HF environments and to develop a carbon steel materials specification with respect to the levels of residual elements and carbon in steels for HF alkylation equipment.

Operation of hydrofluoric (HF) acid alkylation units using primarily carbon steel construction material has been the norm for over 60 years. There have been few problems associated with the use of this material for many years. There have been problems reported within the last 10 years where a nonuniform corrosion phenomenon occurs leading to plant incidents. Residual elements (RE), Cr, Ni and Cu in carbon steel were implicated as a potential cause for this problem. There were inconsistencies though claimed by others or within differing parts of the plant about this RE effect. Galvanic effects were reported that might negate the possible beneficial use of low RE materials. This paper reports the key results of the Joint Industry Project “Materials Specification for HF Alkylation Plant” whose primary objectives were to develop test and corrosion rate measurement procedures for evaluating materials in HF environments and to develop a carbon steel materials specification with respect to the levels of residual elements and carbon in steels for HF alkylation equipment.

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