Flanges

Please see previous threads on this issue -

http://cr4.globalspec.com/thread/27249

http://cr4.globalspec.com/thread/27210

Also - what do you mean by different flanges?

1. Different classes?
2. Different materials?
3. Different styles? (slip-on/WN/...)
   

Only if the bolt hole patterns match.

But as the 1st reply assumes that isn't what you really want to know.

The more information you give, the more questions you ask, the better the answers will be.

Also - are you asking about mating 125# Cast Iron flanges to Steel flanges?

If so, you have to be careful, because when mating cast iron flanges to raised face steel flanges - usually the CI flange is flat and when it is tightened against the raised face it torques over and can lead to cracking in the cast iron body.

When this needs to be done it is usually recommended to machine the steel flange flat and install a full-face gasket - or install a spacer ring outside of the raised face.