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
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
- Flat face. (FF)
- Raised face. (R/F)
- Tongue and groove. (T/G)
- Male and female. (M/F)
- Ring type joint. (RTJ)