Alternatives to HIC resistant steels in sour refinery environments

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20002646

Jack, B L

Based on recent laboratory data and field experiences, the use of HIC resistant steels as a viable solution to wet H{sub 2}S 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 H{sub 2}S 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 H{sub 2}S inspection programs allowed for significant adjustments of inspection intervals based upon these parameters. Some current wet H{sub 2}S inspection programs call for frequent WFMT inspection (typically 5 years maximum) for all vessels in high risk wet H{sub 2}S 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.

• Research Organization: Chevron Technology Co., Richmond, CA (US)
• OSTI ID: 20002646
• Report Number(s): CONF-990401--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
CARBON STEELS
CORROSION PROTECTION
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
HEAT TREATMENTS
HYDROGEN EMBRITTLEMENT
HYDROGEN SULFIDES
IN-SERVICE INSPECTION
PETROLEUM REFINERIES
PROTECTIVE COATINGS