Vertical Itt 500 galon fire pump

[Oleg25]

Hello Everyone.
I am installing a 500GPM Vertical in-line pump from A-C Fire Pumps. On the suction side I have 6" main, but the pump is 4". It might sound like a stupid question, but, should I put an eccentric reducer or concentric reducer?
Thank you!

Regards

Oleg.

 

[LCREP]

From NFPA 20, 2013 ED
4.14.6.4 Eccentric Tapered Reducer or Increaser. Where the suction pipe and pump suction flange are not of the same size, they shall be connected with an eccentric tapered reducer or increaser installed in such a way as to avoid air pockets.

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