Eccentric Reducers

Eccentric reducers have a changing centreline for the bore, with one side remaining parallel. Eccentric reducers are used at the suction side of pumps to ensure air does not accumulate in the pipe. The gradual accumulation of air in a concentric reducer could result in a large bubble forming that could eventually cause the pump to stall or cause cavitation when

drawn into the pump, with the flat side in the upper position this is avoided. Also eccentric reducers can be useful with the flat side down to allow for the complete draining of pipelines and preventing the pooling of liquid which can happen with concentric reducers in horizontal piping.

The dimensions below are to suit ASME 150 flanges.

To Suit Pipework NBFace – Face AOffset B
Large BoreSmall Bore
InchesmmInchesmmmmmm
3/4″201/2″151143
1″251/2″151146
1″253/4″201143
1.1/2″401″251147
2″501″2512713
2″501.1/2″401276
3″801″2515228
3″801.1/24015220
3″802″5015214
4″1001.1/24017833
4″1002″5017821
4″1003″8017813
6″1503″8022940
6″1504″10022927
8″2004″10027952
8″2006″15027925
10″2506″15030552
10″2508″20030527
12″3008″20035652
12″30010″25035625
14″3508″20040668
14″35010″25040641
14″35012″30040616

Typically supplied as a transfer moulded PFA lined investment cast steel construction, we use fabrications and PTFE liners for reducers  fitted with rotating flanges etc.