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Concentric Reducer NFPA Provision?

Question asked by josephaclaros on Nov 5, 2018
Latest reply on Nov 6, 2018 by nocivus

Good day! Is there any privision on NFPA20 states on concentric reducer or increaser for fire pump discharge line? i ask because i had encountered a fire pump configuration that after discharge, pipe spool first then increaser (see below reference). Is there an effect on fire pump performance with this kind of set-up?