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7 Types of Flanges Used in Piping Systems

A flange is a type of mechanical joint system that provides a reliable means to connect pipes, valves, pumps, and other components to form a seal-proof piping system.

Flanges are typically threaded or welded, and two flanges are connected by bolting them with gaskets to form a seal that allows easy access to the pipe system.

A flange is an essential part of pipeline infrastructure and the second-most used joining method after welding.

The various types of flanges utilized in pipe systems are described below according to their diameters and other variables:

  1. Slip-on Flange
    A slip-on flange is a flange that attaches to a pipe or fitting via two fillet welds, one within the flange cavity and the other outside the flange.

Slip-on flanges are flanges that slip over a pipe, hence the name. The bore size of a slip-on flange is greater than the connecting pipe’s outer diameter, so the pipe must move inside the flange to be connected by a fillet weld.

Slip-on flanges are a kind of flange that is often used in fluid pipelines.

  1. Threaded Flanges
    Threaded flanges resemble slip-on flanges, but the main difference is that the threaded flange has been bored out to fit the inner diameter of a particular pipe.

The threaded flanges save time and money and are great for piping systems with small diameters. They are also the only choice for flanges in areas with a high risk of explosions where welding is dangerous.

  1. Weld Neck Flange
    A weld neck flange is also called a high-hub flange or tapered hub flange. The pressure that builds up at the bottom of the flange may be reduced by using a weld neck flange with a neck that can move the tension in the pipe.

Read more: 7 Types of Flanges Used in Piping Systems