Dear team ! Can you please advis 3

[Allets]

Dear team !

Can you please advise what does "RF R9 flange" mean ?
I can understand RF (raised face) but I couldn't have found any information on R9 in the ASME standards
Thank you

 

[LittleInch]

A bit weird, but looks like it means that a groove is cut into the flange to allow use of an R9 O ring. They are small 10.5mm diam x 2.7mm

What's the full designation of that flange, size, rating etc?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Prometheus21]

Outside my purview but;

I do believe the R9 is just the flange rating and means Flange ANSI class 900 ring joint, covered by ASME B16.5.

 

[LittleInch]

I've seen that as well but normally you would say RTJ, not RF.

But knowing the size and what else is said about this flange might help...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Prometheus21]

I agree, more info is needed. It does however seem like Emerson uses this description in their Rosemount product portfolio (not endorsing here, just relaying info my coworkers showed me). As you can see they specify R9 as an RTJ. "RF R9 flange" does seem like an incomplete description, or at least a confusing one.

 

[LittleInch]

It could mean an RF class 900 flange to differentiate from the RTJ type listed above?

I've seen ref to Emerson as well.

We await a response!

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[LittleInch]

Ah,

Would have been good to have that included in the OP....

It certainly isn't an R9 O ring then.
Or a class 900 flange.
Or an RTJ type flange.

"ANSI" hasn't been used for decades to describe flanges so this may be something which was included in a much earlier edition of the code and just left there. The history section of ASME B 16.5 refers to flange finished in their 1996 version when it changed to ASME B 16.5.

The current version in 6.4.5.3 just lists dimensions / roughness in microns and no mention of an R number.

So I'm out of ideas unless you can find a version of the flange code from 1996 or earlier which mentions this.

This is the closest I can find from the 1996 edition where Ra might be the R you are looking at?

Face Finish. The finish on the face of a flange is
measured as an Arithmetical Average Roughness
Height (AARH). The finish is determined by the
standard used. For example, ANSI B16.5
specifies face finishes within a range 125AARH -
500AARH (3.2 Ra to 12.5 Ra). Other finishes are
available on request, for example 1.6 Ra max,
1.6/3.2 Ra, 3.2/6.3 Ra or 6.3/12.5 Ra. The range
3.2/6.3 Ra is most common.

Maximum now is 6.3 micron (250 micro inches).



Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Allets]

LittleInch
Thank you for the search you've done for me, this explains a lot anyway. Is there any good tradition on this forum how a user can thank well in return ? Can I do anything else ?

 

[LittleInch]

No problem. No the "great post" function and some text in your further response is as good as it gets.

I can't say for certain that R9 doesn't mean something else, but sometimes vendors just don't update their data for something they've been building for decades.

The use of ANSI does date it a bit...

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.