flange size 1

[santoshdada]

can any one tell me whether pipe schedule is required while selecting a flange

 

[Zapster]

What type of flange?

Look at

http://www.engineeringtoolbox.com/carbon-stainless-steel-flanges-d_351.html

 

[IFRs]

Generally not - pipe OD is constant, the ID varies with wall thickness.

 

[pennpiper]

The answer is both 'No' and 'Yes.'

If your flanges are to be "Slip-On" Flanges, then 'No' you do not need to specify the pipe inside-diameter (ID) when buying the Flanges. This is because the pipe slides inside the flange so the ID at the flange joint is the ID of the pipe.

However, if your flanges are Weld-Neck flanges then you should purchase the flanges to match the ID of the Pipe. If you are using Schedule 40 pipe you would not want the flange vendor to unload a bunch of flanges with a XXH bore on you. Or if you are using XXH pipe you would not want a flange vendor to supply flanges with a Schedule 40 bore. In most sizes either case could force you into an extra cost operation to taper-bore (one or the other) to make a proper fit and weld.

I recommend that you always buy your flanges to match your pipe.

 

[TBP]

If you're considering weld neck flanges, then you need to spec the pipe wall thickness.

 

[vesselfab]

also with socket weld flanges

 

[Cockroach]

Correct, pipe schedule defines wall thickness. You would need to match the bore size as close as possible given the nominal pipeline size. "Schedule" allows this, so I would venture to say that it is critically important!

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

 

[bingopin]

What pennpiper says.