Carbon steel nozzle cladded with AL6XN

[gte682n]

Hello,

I am reviewing a proposal to replace a 16" diameter nozzle with a 20" nozzle on a distillation column. The column has a carbon steel outer shell 39/64" thick, 316 SS clad liner 5/64" thick and then 904L strip lining 10 GA thickness. They are proposing to provide a carbon steel nozzle cladded with AL6XN, since it is more readily available then 904L. Are there any pro's or con's to this compared to a solid AL6XN nozzle? Is it preferable to avoid dissimilar material welding between the carbon steel shell and an AL6XN nozzle? Any other factors to consider? I am having difficulty locating material of construction information for the existing 16" nozzle.

Thank you,

Dee

 

[EdStainless]

Will the new one be made from clad plate? Like explosively bonded?
If the column is lined then what is the issue?
I would rather see steel welded to steel with the alloy liner than trying to weld solid AL-6XN to steel.

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P.E. Metallurgy, Plymouth Tube

 

[metengr]

I would prefer carbon steel clad with AL6XN from the standpoint of a dissimilar joint and all of the problems associated with it using solid AL6XN.

This will be of help

https://www.rolledalloys.com/shared...s/fabrication-information/AL-6XN_FI_US_EN.pdf

 

[gte682n]

Excellent. Got the message loud and clear. Much appreciated to the two of you.

Thanks,