Weld Strength Paths...v.2.0
Weld Strength Paths...v.2.0
(OP)
thread794-247823: Weld Strength Paths
One year+ later...
Please reference the attached thread, with this in mind:
I've been able to satisfy myself with just about everything but this:
(b) PI/2*mean nozzle dia.*tn*Mod Allowable S
How is this the nozzle shear failure capacity portion of failure path 2-2 in Fig. UG-41.1? Why is it not something like:
PI/2*(O.D.^2-I.D.^2)*Mod Allowable S?
One year+ later...
Please reference the attached thread, with this in mind:
I've been able to satisfy myself with just about everything but this:
(b) PI/2*mean nozzle dia.*tn*Mod Allowable S
How is this the nozzle shear failure capacity portion of failure path 2-2 in Fig. UG-41.1? Why is it not something like:
PI/2*(O.D.^2-I.D.^2)*Mod Allowable S?
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RE: Weld Strength Paths...v.2.0
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Fitter, happier, more productive
RE: Weld Strength Paths...v.2.0
In your thread794-247823: Weld Strength Paths, you were talking about the calculations in L-7.2 which illustrates reinforcement and strength calculations for a nozzle inserted through the vessel wall. Thus the nozzle wall shear is in the path 1-1 in sketch (a) of Fig. UG-41.1
Don't you mean PI/8*(O.D.^2-I.D.^2)*Mod Allowable S?
RE: Weld Strength Paths...v.2.0
Think your proposed eqn should have Pi/4 and not Pi/2. In which case both equations would yield the same results.
RE: Weld Strength Paths...v.2.0
If I calculate for the same nozzle
PI*mean nozzle dia*tn=PI/4*(O.D.^2-I.D.^2)
as dsb suggests, but UG-41(b) states 'one each side of the plane defined in UG-40(a). This detail is what makes doc's equation correct with the code:
PI/8*(O.D^2-I.D.^2)
which yields the same results as the code's version:
PI/2*mean nozzle dia*tn.
Bingo! Man, that has been bothering me for a long time now! I just put my trust in the software last go around. Since it's Friday, I might do the algebra to get from one equation to the other, just for exercise.
Thanks guys (girls?)!
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Fitter, happier, more productive