REPLIES ON COMMENTS

1)Jacket side design pressure is 6kg/cm2 and is already mention in GA drawing.
2)There is no any Helix  inside steam jacket.
3)Why there is need of lifting lugs for each section?
It is not necessary to give bracket support for each section. 
4) Yes there are spiral in 4th compartment.

Please confirm the nozzel size of feed, Vapor and product outlet nozzel.