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Types of Reducers

DataTime:[2016-8-12]
A reducer is the component in a pipeline that reduces the pipe size from a larger to a smaller bore (innerdiameter).

The length of the reduction is usually equal to the average of the larger and smaller pipe diameters. There are two main types of reducer: concentric and eccentric reducers.

A reducer can be used either as nozzle or as diffuser depending on the mach number of the flow.

A reducer allows for a change in pipe size to meet hydraulic flow requirements of the system, or to adapt to existing piping of a different size. Reducers are usually concentric but eccentric reducers are used when required to maintain the same top-or bottom-of-pipe level.

These fittings are manufactured in inch and metric size.

Concentric Reducers are used to join pipe or tube sections on the same axis. They provide an in-line conical transition between pressurized pipes of differing diameters. A pipe reducer can be a single diameter change or a multiple diameter change. The pipes cannot recognize what the outside configuration of the pipe reducer looks like. The pipe flow is affected by the inside diameter conical transition configuration which can be axially moved and externally reconfigured to provide for more economical reducer fittings. Thus, concentric reducers connect pipes of unequal size but have a common centerline. In other words, it is a type of pipe fitting with different size ends to join pipes of different diameter that joins pipe sections on the same axis.

Concentric reducers are designed with the small and large diameters on opposite ends and joined by a cone shaped transition section. They are available in both seamless and welded construction.


How to take measurements of concentric reducers?

Get the measurements of outer diameter (OD) and inner diameter (ID) , height (H), and the total dimension (T1, T2).


Uses of concentric reducers:
Some uses of concentric reducers are as follows:

Concentric reducers will transition gracefully between the piping and the pump.
The concentric reducers help in transporting slurries or abrasive liquids.
They are useful in services where cavitation is present.
When transporting between flanges or pipes of different ratings and wear protection is necessary, concentric reducers are ideal.

Concentric reducers are used in discharge of the pump.


An eccentric pipe reducer fitting is manufactured with the smaller outlet off center to the larger end, which allows it to align with only one side of the inlet. The reducer must be installed with straight side up so that it can prevent trapping air at the pump suction. The eccentric pipe reducers allow simple connection of different sized pipes.
Uses of eccentric reducers:

Keeping big pipes and small pipes together.
Reducing noise and vibration at the same time.
Requires less installation space.
Absorbs pipe wall and fluid borne noise.
Less turbulence or material entrapment.
Eccentric reducer are used with flat side up in pump suction to avoid cavitation.

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