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 NB				Face – Face A	Offset B
Large Bore		Small Bore		Face – Face A	Offset B
Inches	mm	Inches	mm	mm	mm
3/4″	20	1/2″	15	114	3
1″	25	1/2″	15	114	6
1″	25	3/4″	20	114	3
1.1/2″	40	1″	25	114	7
2″	50	1″	25	127	13
2″	50	1.1/2″	40	127	6
3″	80	1″	25	152	28
3″	80	1.1/2	40	152	20
3″	80	2″	50	152	14
4″	100	1.1/2	40	178	33
4″	100	2″	50	178	21
4″	100	3″	80	178	13
6″	150	3″	80	229	40
6″	150	4″	100	229	27
8″	200	4″	100	279	52
8″	200	6″	150	279	25
10″	250	6″	150	305	52
10″	250	8″	200	305	27
12″	300	8″	200	356	52
12″	300	10″	250	356	25
14″	350	8″	200	406	68
14″	350	10″	250	406	41
14″	350	12″	300	406	16

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.