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We're going to need a little more information. Which flange, what standard, ANSI or DIN? What size?
Inventor 2020, In-Cad, Simulation Mechanical
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Delta Tau Chi ΔΤΧ
Pipe a funny item. Even though the standard size is measured by in inside, this is only for the "Standard" size. After that the different schedule of pipes, the only thing that changes is the inside diameter of pipes. This is due to the fact all pipes are threaded on the outside, so all pipe threads are the same.
This is why there are no different schedules of flanges since there is only one size of pipe thread for each size of pipe. The wall thickness increases but the OD always remains the same.
Place a number of pipes of the same size but difference Schedules and measure the OD. You will find that there are all the same (or within a couple of thou).
Inventor 2020, In-Cad, Simulation Mechanical
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Delta Tau Chi ΔΤΧ
In this case, @mangesh.deshmukh is referring to weld-neck flanges and the bore of the WN flange would be different based on the schedule (wall thickness) of the pipe. @mangesh.deshmukh if you actually want the correct bore to appear (I'm thinking the content center standard is based on STD pipe wall thickness), you would have to create your own read/write library and copy of the flange information from the provided to your custom library. Then you can modify it and add schedule information.
Update: For example, there's about 1 1/2 in difference in bore size from an 8in sch 10 150# RF Weldneck flange to sch XXH.. Which is a big change but some may not consider showing the actual bore but it could throw the overall weight off if you have numerous flanges with the incorrect bore diameter. 
Mark Lancaster
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As Mark posted, the CC is not complete and sadly lacking in many areas. You will need to check with your supplier even if such items are available and get product dimensions before modeling. Many a post have been on this forum where people have gone ahead and used CC items without verifying their accuracy or availability.
Unless the flange is going to fit inside the pipe, it won't make any difference. All pipe of same size regardless of the schedule will have the same OD. This is why there is no Schedule in the Flanges within the CC
https://www.engineersedge.com/pipe_schedules.htm
Inventor 2020, In-Cad, Simulation Mechanical
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Delta Tau Chi ΔΤΧ
"Unless the flange is going to fit inside the pipe, it won't make any difference." That's not really true.. 
This is what I was referring to and its lacking (in CC) especially for weldneck flanges because it will throw the weights off because the bore of the WN flange may be incorrect unless you are always using STD/SCH 40.
Mark Lancaster
& Autodesk Services MarketPlace Provider
Autodesk Inventor Certified Professional & not an Autodesk Employee
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