Comments of vessel sizing

Vessel sized for liquid surge drum and vapor/liquid separation by gravity settling method can be used for final design. Vessel siz for vapor/liquid separation by mist eliminator method should be checked by the mist eliminator vendor to confirm its size. Vessel sized for Hquid/liquid separation by surge volume method or with coalescer pad is a rough preliminary sizing. Its size should be checked by vendor or an expert. 

Vessel nozzle size should not be over S0% of vessel diameter to avoid expansive reinforce pad requirement. Maximum nozzle size is preferred to be about 40% or less of vessel diameter. 

Per Code (ASME Section VIII, Div. 1), vessel should be stress relieved, if its wall thickness Is 1.5 or larger. 

For large vapor flow, it may be cheaper to use split flow design to reduce the required vapor flow area. Feed will enter the vessel at its midpoint and vapor exits from both ends of the vessel, or feed is split to half and enters the vessel from each end, and vapor exits fix m vessel s midpoint. 

Vessel internals some is removable, and some is not It is up to the user to specify. Removable internals should be able to pass thru the manway. Normal manway size varies fitom IS to 24 , 

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