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Raised Face SS Flanges mated to FF CS pipe

Raised Face SS Flanges mated to FF CS pipe

Raised Face SS Flanges mated to FF CS pipe

(OP)
Hi all,
There was another thread similar, however we have the following dilemma.
We are looking to fit 150lb raised face 316SS valves into CS pipe that will have flat flanges.  I read the other post about ring gaskets, however is there a problem here?  As the valves are not Cast Iron they come standard with RF and not FF flanges.  (It seems CI have 125lb FF flanges)  
Is this a problem with SS flanges and CS Flat Faced flanges?
If it was 1 valve I probably would just get them machined off, but there are about 150 going to be put in next month.
Help/comments would be appreciated.
Ed

RE: Raised Face SS Flanges mated to FF CS pipe

If you don't have any Cast Iron flanges or valves, then you don't have a problem. It is perfectly OK to bolt up FF carbon steel flanges to stainless steel RF flanged valves. Ring cut gaskets are OK too.

NozzleTwister
Houston, Texas

RE: Raised Face SS Flanges mated to FF CS pipe

(OP)
Thanks,
I feel better now.
Ed

If life were easy....we'd all be doing it.

RE: Raised Face SS Flanges mated to FF CS pipe

I agree with Mr NozzleTwister on SS/RF to CS/FF flange bolt up, But you might look at putting insulating gasket kits at those connections because of the dissimilar metals.   ...Mark

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