Length through Hub & RTJ Height of Non-STD 2500# WNRF flanges
Length through Hub & RTJ Height of Non-STD 2500# WNRF flanges
(OP)
Hello!!!
Dear Friends,
I am new to this forum.Actually,I am having a problem with deciding the length through hub of WNRF flanges while designing as per App-2.Where in code can I get the reference for the requirement of g1,g0 and length through hub.
Moreover,my other query is what should be or how to determine the RTJ height for 2500# non- standard WNRF flange( 30 Inch )?As the information on this size and rating is not mentioned in ASME B16.47.
Please help me out of this problem.
Thanks in advance.
Shanamo
Dear Friends,
I am new to this forum.Actually,I am having a problem with deciding the length through hub of WNRF flanges while designing as per App-2.Where in code can I get the reference for the requirement of g1,g0 and length through hub.
Moreover,my other query is what should be or how to determine the RTJ height for 2500# non- standard WNRF flange( 30 Inch )?As the information on this size and rating is not mentioned in ASME B16.47.
Please help me out of this problem.
Thanks in advance.
Shanamo





RE: Length through Hub & RTJ Height of Non-STD 2500# WNRF flanges
Don't know anything to offer on your RTJ, contact a gasket maker maybe?
Regards,
Mike
RE: Length through Hub & RTJ Height of Non-STD 2500# WNRF flanges
Thanks for the response.
Pls. make this a bit more clear.This h will be 1 to 2 inch plus g0 or only 1-2 inch? Because sometimes this hub length might be too short to meet App-2 requirement.
Thanks,
Shanamo
RE: Length through Hub & RTJ Height of Non-STD 2500# WNRF flanges
So suppose your g0 is equal to 1/2 inch. A typical hub might then be q1 = 11/16 or 3/4, h = 1 to 1 1/4. Or to put it more generally g1, might equal g0 + 1/4, h = 2 * g0.
As I said the exact hub dimensions affect, of course, stresses in the hub, and also flange ring portion stresses (thickness). Hopefully, you have a flange design program of some sort that you can evaluate overall effect of various hub dimensions.
As you can see from the design equations hub dimensions affect a great deal of the subsequent calculations. I don't know of any way to truly "optimize" the hub dimensions effect on overall flange design, whatever "optimize" may be chosen to mean.
Often it is "better" to use a shortish hub, so as to minimize chips (scrap) in the machining of the flange, even at the expense a slightly thicker ring. Or to put it another way, minimize the rough forging weight.
Regards,
Mike
RE: Length through Hub & RTJ Height of Non-STD 2500# WNRF flanges
RE: Length through Hub & RTJ Height of Non-STD 2500# WNRF flanges