Flanges: what are the types of flange?

Flanges are used to connect two pipes or to connect a pipe to a fitting or equipment. Flanges are typically made of steel, stainless steel, or cast iron, and they are held together by bolts and a gasket. The gasket provides a seal between the flanges to prevent leaks.

Types of flange

Slip-On Flange : – The Slip-on type flanges are attached by welding inside as well as outside. These flanges are of forged construction

Socket Weld Flange: – The Socket Weld flanges are welded on one side only. These are used for small bore lines only.

Screwed Flange : – The Screwed flanges are used on pipe lines where welding cannot be carried out.

Lap Joint. Flange: – The Lap Joint flanges are used with stub ends. The stub ends are welded with pipes & flanges are kept loose over the same.

Weld Neck Flange : – The Welding neck flanges are attached by butt welding to the pipe. These are used mainly for critical services where the weld joints need radiographic inspection.

Blind Flange: – The Blind flanges are used to close the ends which need to be reopened for modification, servicing or extending the header length  for increasing the capacity.

Reducing Flange : – The reducing flanges are used to connect between larger and smaller sizes without using a reducer. In case of reducing flanges, the thickness of flange should be that of the higher diameter.

Integral Flange : – Integral flanges are those, which are cast along with the piping Component or equipment.

Pressure temperature rating  of Flanges

  • #150
  • #300
  • #400
  • #600
  • #900
  • #1500
  • #2500

Pressure temperature rating carts in the standard ASME16.5 specify the non-shock working gauge pressure to which the flange can be subjected to at a particular temperature.

Types of facing of flanges

  1. Flat face. (FF)
  2. Raised face. (R/F)
  3. Tongue and groove. (T/G)
  4. Male and female. (M/F)
  5. Ring type joint. (RTJ)

1 thought on “Flanges: what are the types of flange?”

Leave a comment