Although not mentioned, ASME B16.5 - 2003 specifies various surface roughness
- not to exceed 3.2 micrometer (125 micro in.) roughness
- ... serrated spiral finish having a resultant surface
finish from 3.2 to 6.3 micro m (125 to 250 micro in.) average roughness.
The term Ra was not used.
Interpretation: 4-4
Question (3): According to ASME B16.5-1996, para. 6.4.4.3, may a flange with less than 45 grooves per inch or more than 55 grooves per inch meet the flange facing finish requirements as long as the resultant surface finish has a 125 to 250 micro in. average roughness?
Reply (3): Yes.
BTW, The character mu was used throughout ASME B15.5 instead of my spelling micro. I prefer not to find the ASCIIish code to insert the character.
John