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Reply To: DCU fractionator HCGO draw tray damage

Home Forums Coking Technical Fractionation & Process Fractionation DCU fractionator HCGO draw tray damage Reply To: DCU fractionator HCGO draw tray damage

#27489

Mike Kimbrell
Participant

This material is susceptible to cracking at welds or other areas of high induced stress, particularly in high H2S environments. Use of type 405 or 410S stainless steels is done to reduce the risk of this cracking. Bolted trays of type 410 have given good service as long as the bolts are 405 or 410S, otherwise they will crack. API 571 – Damage Mechanisms discusses 885 F (475 C) embrittlement discusses trays constructed of type 410 stainless steel that operate at temperatures in excess of 600 F (316 C) for long periods of time will lower the toughness of this material at lower temperatures. Multiple shutdowns and start-ups could cause damage to the trays if their toughness was low enough.

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