Roughness of the pressure rated flange
Roughness of the pressure rated flange
(OP)
Quick and Easy!
How do you calculate the surface roughness of a flange while designing it for a pressure rated application to mate the companion flange?
Thanks in advance!
Alex Afkhami
Mechanical Designer
Siemens-Milltronics





RE: Roughness of the pressure rated flange
We had an internal standard for all type flanges depending on the anticipated gasket. Rougher for elastomeric materials and smoother for metallic types, but very definite callouts.
Every gasket manufacturer will have a recommendation for the surface finish that is recommended for a particular gasket type or style.
RE: Roughness of the pressure rated flange
The problem is that This is a flange for a level measurement instrument that can be used by different customers and of course with different gaskets, so, any recommendation for a general value that I can use (for the most critical situation) would be a great help.
Best regards,
Alex
RE: Roughness of the pressure rated flange
Do you recommend a particular style gasket?
RE: Roughness of the pressure rated flange
RE: Roughness of the pressure rated flange
Tongue and groove: 3.2 microns max
Ringe joint: 1.6 microns max
Other faces: 3.2 to 6.3 microns
RE: Roughness of the pressure rated flange
"The finish of the gasket contact faces shall be judged by
visual comparison with Ra standards (see ASME B46.1)and not by instruments having stylus tracers and electronic amplification."