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Case study: Cracking occurred in a (UNS S32100) type austenitic stainless steel nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up. Normal preventive measures had been taken. The failed sample was removed for metallurgical analysis and determination of mechanism(s).
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Different refiners have a variety of procedures in place for hydroprocessing reactor and reactor system shutdowns, depending on the scope of the work to be performed during the downtime. If activities are to be performed inside the reactor (e.g. inspection, maintenance, catalyst changeout, etc.) such that the reactor must be opened to air, shutdowns must include steps to address the various hazards. These same steps must also be applied to associated process equipment related to the reactor system susceptible to similar hazards and damage mechanisms.
Methods to protect austenitic stainless steel from polythionic acid stress corrosion cracking (SCC) found to occur during downtimes and contiguous shutdown and start-up periods. Historical Document 1986
Methods to protect austenitic stainless steel and other austenitic alloys from polythionic acid stress corrosion cracking (SCC) occurring during downtimes and contiguous shutdown and start-up periods. Historical Document 1993
Methods to protect austenitic stainless steel and other austenitic alloys from polythionic acid stress corrosion cracking (SCC) occurring during downtimes and contiguous shutdown and start-up periods. Historical Document 1997
Examines varying procedures used by industry to protect austenitic stainless steel equipment while idle. Basic protection methods include nitrogen purging, alkaline wash solutions, and dry air purging. Protection of reactors is also addressed.
This standard practice provides mitigation methods to protect austenitic stainless steels and other austenitic alloys from polythionic acid (PTA) stress corrosion cracking (SCC) that can occur during a shutdown of refinery equipment. A shutdown includes the actual down time period and the contiguous periods required to shut down and start up the equipment.