Download PIPING QUESTIONNAIRE NOTE
Questions related to Pipe Fittings :
1. How can flanges be classified based on Pipe Attachment?
Answer :
Flanges can be classified based on pipe attachment as :-
Slip on . - The slip – on type flanges are attached by welding inside as well
as outside. These flanges are of forged construction.
Socket Weld - The Socket Weld flanges are welded on one side only. These are used for small bore lines only.
Screwed - The Screwed – on flanges are used on pipe lines where welding cannot be carried out.
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.
Welding Neck- The welding neck flanges are attached by butt welding to the
pipe. These are used mainly for critical services where the weld joint need radiographic inspection.
Blind - The Blind flanges are used to close the ends which need to be reopened.
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.
Integral - Integral flanges are those, which are cast along with the piping
component or equipment.
