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Concentric Reducers are used for vertical piping whereas eccentric reducer are used at Pipe rack to maintain bop and Flat side Up at Pump Suction to avoid cavity.
Eccentric reducers are used to maintain the same bottom of pipe. It is extensively used when the pipe is on a long run on a sleeper/pipe rack and there are other pipes which are also supported from the same top of steel. Exceptions are at pump suction where we should haveflat side up in order to avoid bubble formation in the pump inlet which could lead to cavtation and damage of impellars of the pump. All other places concentric reducer is fine.
Where pipe laying on a pipe rack or a slipper without any support,Eccentric Reducers are used with flat side down. And Eccentric Reducers also used in pumps suction side with flat side up.
Where pipe on a pipe rack or a slipper with support under the pipe ,Concentric Reducers may be used too. It is used in pumps discharge side.
normaly we use the eccentric reducers on pipe rack to keep BOP in the same level..
Eccentric reducers are used in chilled and heating water pipes networks.
