some time in lnlet or outlet of column many nozzle is connect in series what is the function of this arrangement? for example inlet is 1"/2"/4" nozzle connected in series one above the others?
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You would need to look at the internals and the P&ID of such a situation to determine the "Why" and "How".
The ones I have seen in my past projects had valves in the piping attached to each nozzle and the identical internals so it allowed for alternate inlets or alternate outlets for the process.
I would expect diptubes or other internals, but Penn Piper is correct: the P&ID should provide the definitive answer. Everything else here is speculation and what we've gotten to see before.
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