Flanges | Pipe Flanges | Classification of Flanges
Rate this post
Flanges
1. How can flanges be classified based on Pipe Attachment?
Answer: –
Flanges can be classified based on pipe attachment as: –
1.) Slip – on:-The Slip-on type flanges are attached by welding inside as well as outside. These flanges are of forged construction.
2.) Socket Weld: – The Socket Weld flanges are welded on one side only. These are used for small bore lines only.
3.) Screwed: –The Screwed-on flanges are used on pipe lines where welding cannot be carried out.
4.) Lap Joint: – The Lap Joint flanges are used with stub ends. The stub ends are welded with pipes & flanges are kept loose over the same.
5.) Welding Neck: – 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.
6.) Blind: –The Blind flanges are used to close the ends which need to be reopened.7.) Reducing. : – 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.
7.) Integral: – Integral flanges are those, which are cast along with the piping component or equipment.
2. How can flanges be classified based on Pressure- temperature ratings?
Answer: –
Flanges are classified based on pressure temperature ratings as: –
A. 150
B. 300
C. 400
D. 600
E. 900
F. 1500
G. 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.
3. How can flanges be classified based on facing?
Answer: –
Flanges are classified based on facing as: –
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)
4. How can flanges be classified based on face finish?
Answer: –
Flanges are classified based on face finish as: –
A. Smooth finish.
B. Serrated finish.
5. Where the smooth finish flange & serrated finish flange finds its use?
Answer: –
The smooth finish flange is provided when metallic gasket is provided and serrated finish flange is provided when non-metallic gasket is provided.
6. What are the types of serrated finish provided on flange face?
Answer: –
A. Concentric or
B. Spiral (Phonographic)
7. How the serration on flanges is specified?
Answer:
The serration on flanges is specified by the number, which is the Arithmetic Average Rough Height (AARH).
8. Where the concentric serration is insisted for face finish?
Answer: –
Concentric serration are insisted for face finish where the fluid being carried has very low density and can find leakage path through cavity.
