ANSI B16.5 Flanges pressure ratings for different materials
ANSI B16.5 Flanges pressure ratings for different materials
(OP)
I am looking for information about pressure ratings recommended for ANSI B16.5 flanges. I have already found a chart for this detailing the allowable pressure ratings for steel pipe flanges but the material I am using is Stainless steel 316(CF8M) and I was wondering if anybody knows where you can get pressure ratings for different materials instead of just steel?





RE: ANSI B16.5 Flanges pressure ratings for different materials
See this table header example:
Table 2-2.1 Pressure–Temperature Ratings for Group 2.1 Materials
Nominal Designation Forgings Castings Plates
18Cr–8Ni A 182 Gr. F304 (1) A 351 Gr. CF3 (2) A 240 Gr. 304 (1)
A 182 Gr. F304H A 351 Gr. CF8 (1) A 240 Gr. 304H
RE: ANSI B16.5 Flanges pressure ratings for different materials
Is these tables available anywhere on line or would i have to purchase the book?
RE: ANSI B16.5 Flanges pressure ratings for different materials
http://www.ihs.com/
RE: ANSI B16.5 Flanges pressure ratings for different materials
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
RE: ANSI B16.5 Flanges pressure ratings for different materials
The most current editions are:
ASME B16.5-2003 (issued Oct. 2004)
ASME B16.34-2004 (issued Sept. 2005)
Some of the values for Stainless Steel have been revised in the most recent issue from the previuos one. Some values went up and some went down.
Be sure you get the correct Code copy that is/was in effect for your work, not just any Code copy.
Good luck,
NozzleTwister
Houston, Texas
RE: ANSI B16.5 Flanges pressure ratings for different materials
RE: ANSI B16.5 Flanges pressure ratings for different materials
I will appreciate your help.
RE: ANSI B16.5 Flanges pressure ratings for different materials
ASME 16.5 is for regular pipe flanges and ASME 16.36 is for Orifice Flanges.
ASME B16.36 defines the taps, ports, jacking bolts etc. that are required for Orifice Flanges. B16.36 references B16.5 but is limited to the flange sizes that are suitable for taping. The flange thickness may be thicker on some of the B16.36 flanges than a B16.5 flange of the same size and ratings.
NozzleTwister
Houston, Texas
RE: ANSI B16.5 Flanges pressure ratings for different materials
RE: ANSI B16.5 Flanges pressure ratings for different materials
I still find it strange why there are still so many people refering to ANSI B16.5 when the correct Designation is ASME B16.5. Perhaps in another ten years or so everyone may get around to using ASME B16.5 who knows??
RE: ANSI B16.5 Flanges pressure ratings for different materials
Old habbits a hard to break and it doesn't help that so many current catalogs still refer to ANSI B16.5
NozzleTwister
Houston, Texas
RE: ANSI B16.5 Flanges pressure ratings for different materials
Thanks for all the comments but I think I have found a really useful web page that will help a lot on this, everything i want to know anyway.
http://www.gowelding.com/pv/flange.htm
BexVerder
RE: ANSI B16.5 Flanges pressure ratings for different materials
Agreed. But what will be even harder to change is how you call out a class. Most folks I deal with will talk about a 300# or 300 lb flange etc. The # designation disappeared 20 or 30 years ago. When I mark up drawings with CL-300 I frequently get puzzled looks. I ask them to check to see how much the flange they are calling out weighs...
jt