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99425 ALTERNATIVES TO HIC RESISTANT STEELS IN SOUR REFINERY ENVIRONMENTS

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Product Number: 51300-99425-SG
ISBN: 99425 1999 CP
Author: Brian L. Jack
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Based on recent laboratory data and field experiences, the use of HIC resistant steels as a viable solution to wet H2S cracking problems in refineries is being questioned. The use of HIC resistant steels, even with post weld heat treatment (PWHT), may not be a valid means to achieve the common end user goals of both reducing the risk of through wall vessel leaks and reducing inspection and maintenance costs associated with refinery wet H2S service vessels. Some currently available data does not support adjusting vessel inspection intervals based on type of steel, PWHT condition, or even prior cracking history, as even subtle changes in process conditions in higher risk services can promote cracking where none existed previously. Prior versions of some refinery wet H2S inspection programs allowed for significant adjustments of inspection intervals based upon these parameters. Some current wet H2S inspection programs call for frequent WFMT inspection (typically 5 years maximum) for all vessels in high risk wet H2S service and allow for extension of inspection intervals only when corrosion barriers (e.g. cladding or coating) are present. This paper provides some specifics on the data behind these recent philosophy changes.
Based on recent laboratory data and field experiences, the use of HIC resistant steels as a viable solution to wet H2S cracking problems in refineries is being questioned. The use of HIC resistant steels, even with post weld heat treatment (PWHT), may not be a valid means to achieve the common end user goals of both reducing the risk of through wall vessel leaks and reducing inspection and maintenance costs associated with refinery wet H2S service vessels. Some currently available data does not support adjusting vessel inspection intervals based on type of steel, PWHT condition, or even prior cracking history, as even subtle changes in process conditions in higher risk services can promote cracking where none existed previously. Prior versions of some refinery wet H2S inspection programs allowed for significant adjustments of inspection intervals based upon these parameters. Some current wet H2S inspection programs call for frequent WFMT inspection (typically 5 years maximum) for all vessels in high risk wet H2S service and allow for extension of inspection intervals only when corrosion barriers (e.g. cladding or coating) are present. This paper provides some specifics on the data behind these recent philosophy changes.
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