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Updated on December 8, 2016
Square flanges
Square flanges | Source
Expander flange
Expander flange | Source

What is a flange?

A flange is a metal disc used to join pipes. A gasket is fixed between the two flanges to tighten up the seal. A flange is used to connect two pipes or valves or tubes to form a piping network. Flanges provide support and strength and prevent leakage.

Flanges are commonly welded or screwed into pipes or valves and are then joined with bolts. Flanges provide easy access to clean or inspect a piping system.

Flanges are made of different metal – Stainless Steel, Cast Iron, Ductile Iron, Carbon Steel, etc. As they are made from a variety of metals, flanges differ in their ‘pressure classes’.

Every flange is classified under a pressure class, depending on the capacity of the flange to withstand a particular amount of temperature. Also, the metal used in a flange can determine how much pressure it can withstand.

This means that different flanges can withstand different temperatures (or pressures.) If the temperature increases, the pressure rating of the flange decreases and vice versa.

What is a Square flange?

This flange is square-shaped and has a diameter similar to the standard flange. A pipe to pipe assemblage or a pipe to valve/tee/elbow utilizes a square flange. They also connect nominal bore size pipes.


  • High pressure systems like Hydraulics and steam lines benefit from square flanges as they are durable and can contain high pressure.
  • A square flange requires no welding in order to be attached to the pipe.
  • Ideal for high-temperature, small-sized pipes.

What are Expander Flanges?

It is a welding neck pipe flange where the hub expands to a larger size and is used to change the size of a pipe run. They fit comfortably to any size of pipes, valves, pumps and compressors. They are cost-effective: they are a second option for the 'reducer' and weld-neck' flange combination.


  • They are cost effective
  • They are an alternative option
  • They can fit any size of pipes quickly
  • Its compact size saves space in limited space areas
  • They are available in different ranges widely.

For more information on squared flanges and Expander flanges, visit:

Square flanges
Square flanges | Source
Expander flanges
Expander flanges | Source


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