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
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)