Concentric Reducers

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 
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.

Materials used:

  • Stainless steel
  • Carbon steel
  • Alloy steel
  • Alloy titanium
  • Copper
  • Nickel
  • Cast Iron
  • Brass
  • Bronze
  • Rubber
  • Ceramic

Buyer’s Guide

Factors to consider are as follows:

  • Whether seamless fittings or welded fittings or forged
  • Size and dimension
  • Wall thickness
  • Material of construction
  • Forming type: press-forming for metal reducers
  • Reducers: hot forming for carbon steel reducers
  • Tested for durability, accuracy and precision

Diagrammatic representation of concentric reducer:
Concentric Reducer
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.


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