How To Choose The Right Flange Types?

 

COMMONLY USED BASIC FLANGES

The most common and best flange types widely used for many purposes and in many sites are welding neck, slip-on, socket weld, lap joint, threaded, and blind flange.

Welding Neck Flange

These Flanges are very simple and easy to manage compared to proprietary connections. Their workability is superior, and they are the best design for high-stress service. The welding neck covers the thickness of a wall typically and pipes adjoining with them. The structure of these flanges is explicitly made to work with high pressure and elevated temperature. Some designs contribute a significant part in the smooth transition of pipes’ pressure, depending upon the welding neck flange’s integrity relative to the application.

A small projection of the neck from the base is an obvious characteristic in their structure which helps in the strong bonding with the joint, and ultimately pressure of the liquid will flow smoothly according to the design. Certain things like the quality of the weld connection help a lot, and there is no restriction in transmission when done correctly. Weld neck style connections help decrease corrosion and reduces the risk of the fundamental issue of turbulence in the assembly.

Slip-On Flange

The estimated pressure of the specific type is almost two-third as compared to the welding neck in practicality, but are still rated for pressurized service per ASME/ANSI specifications. An outside, as well as inside weld connection with the pipe, is usually necessary in this case for installation. The whole process of binding/adjusting space is essential while connecting with the other pipeline and making sure not to damage this unit’s face.

Socket Weld Flange

It would be best if you recommend this for medium pressure and smaller nominal pipe sizes. They are compared with slip-on flanges due to their hub size but have a socket for a connection. Joints are assembled with the pipes according to the size and shape if the piping is custom.

Lap Joint Flange

These are included in conjunction with other flange types with all the qualities of previously mentioned flanges, but without the raised face like the others. These are usually used in connections with stub ends to allow for rotation. The one issue of lap joint flange is that their pressure holding capacity can be considered lower compared to the other ones.

Threaded Flange

Much like the other basic flange type designs of slip-on and socket weld, but with an NPT connection in the center, to be defined in size by the user. Other thread connection types are available as custom to mate with the male threaded pipe. These can come with or without hubs.

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