SRU WHB failure mechanisms

[ABBR13]

Regarding SRU WHB failure mechanisms, some of them can occur around ferrule deformed due low content of Al2O3. I’ve heard that ferrule with 94%+ of Al2O3 for SRU WHB it’s ok. Is it correct for a chamber that works at 1800-2400°F? Or the ferrule must contain 98%+ of Al2O3? What’s the minimum content of Al2O3 recommended for the SRU’s ferrule?

 

[Longinthetooth]

what is a ferrule?

 

[ABBR13]

Ferrule is tubesheet refractory linings whose function is to protect metal tubesheets and tubesheet welds from degradation due to high temperature (burner flame temperature) sulphur corrosion in the Sulohur Recovery Units.

 

[Longinthetooth]

It is many years since I worked on units like these. I seem to remember that we specified very high silica refractory (98%+) rather than alumina. Cant be sure. Maybe one of the other guys with recent experience can help.