Reducing Flange

on . Posted in Pipe Flange

Reducing flanges, abbreviated as REDCF, are designed for when there is a change in the pipe size. The predominate flange (dimensions) matching the larger pipe size (NPT) but having a smaller bore matching the smaller pipe size (NPT). These flanges normally come in blind, slip-on, threaded and weld neck flanges. They are available in all pressure classes and provide a good alternative to connecting two different sizes of pipe. This type of flange should not be used if an abrupt transition would create unwanted turbulence, such as at a pump.

Reducing Flange Index


flange reducing 1reducing weld neck flange and slip-on flangeflange reducing 3reducing weld neck flangeflange reducing 2reducing slip-on flange


Reducing Flange Advantages and Disadvantages

  • Reducing flanges provide a versatile solution for connecting pipes of different sizes, allowing for the transition between larger and smaller diameters within a piping system.
  • The use of reducing flanges can contribute to space and weight savings compared to using additional fittings to achieve the same size transition.
  • When properly installed, reducing flanges provide a smooth flow transition between pipes of different sizes, minimizing turbulence and pressure drop in the system.
  • In certain applications, reducing flanges can be more cost effective than using multiple fittings to achieve the same pipe size transition.
  • The design of reducing flanges is relatively simple, making them easy to install and maintain.
  • While reducing flanges are generally straightforward to install, proper alignment during installation is crucial to ensure a reliable connection, and this can add complexity to the installation process.
  • The quality of the weld between the reducing flange and the pipe is critical.  Improper welding can lead to issues such as leakage and reduced joint strength.
  • Once welded in place, reducing flanges have limited rotation capability.  Proper alignment during installation is crucial to avoid misalignment issues.
  • Reducing flanges may have limitations in terms of pressure resistance, and they may not be suitable for high pressure applications.  The design and materials used should be considered in relation to the pressure requirements of the system.
  • Depending on the materials and design, reducing flanges may have limitations in terms of temperature resistance.  Extreme temperatures may impact their performance.
  • Reducing flanges are typically used for specific applications where the transition between pipe sizes is necessary.  They may not be suitable for all types of piping systems.


Piping Designer Logo 1

Tags: Pipe Flange