Types of flange, there rating and flange facing

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

  1. #150
  2. #300
  3. #400
  4. #600
  5. #900
  6. #1500
  7. #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

A. Flat face. (FF)
B. Raised face. (R/F)
C. Tongue and groove. (T/G)
D. Male and female. (M/F)
E. Ring type joint. (RTJ)

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