Stress Corrosion Cracking Issues in Syngas Plants That May be Missed by Risk Based Assessment

摘要

Stress corrosion cracking has been causing problems in syngas plants since they were first developed and many of these cases have been covered in previous ammonia safety conferences. Advancement in plant design, increase in knowledge, and the use of appropriate materials have successfully reduced the occurrence of many problems. However, stress corrosion cracking continues to be a problem in aging plants and must be considered when completing a risk based inspection program or setting integrity operating windows. Case studies on chloride SCC below 60 °C (140 °F), chloride SCC under support plates, pure water SCC of Inconel 600 and polythionic SCC of 304 are provided In each case these damage processes could be easily missed in an RBI assessment.