Sec. VIII Div. 1...L-1.6
Sec. VIII Div. 1...L-1.6
(OP)
Example L-1.6 in Appendix L (page 551) cites an equation for a 2:1 ellipsoidal head.
t= PD
2SE+0.4P
Is that equation correct?
I only ask because I have not found it elsewhere in the Code. The equation resembles
UG-32(d)
t= PD
2SE-0.2P
and
UG-27(c)(2) applicable if the long. stress of a head to shell cir. weld is being considered.
t= PR
2SE+0.4P
What are the chances the the author of this example goofed? It's more likely that I'm missing something but I figure it's worth asking.
t= PD
2SE+0.4P
Is that equation correct?
I only ask because I have not found it elsewhere in the Code. The equation resembles
UG-32(d)
t= PD
2SE-0.2P
and
UG-27(c)(2) applicable if the long. stress of a head to shell cir. weld is being considered.
t= PR
2SE+0.4P
What are the chances the the author of this example goofed? It's more likely that I'm missing something but I figure it's worth asking.





RE: Sec. VIII Div. 1...L-1.6
NO 2 is for o.d. hemispherical head
N0 3 is o.d. circumferential seam
if your vessel is id...they are different
pick up a pressure vessel handbook
spells it out clearly
RE: Sec. VIII Div. 1...L-1.6
I had picked up my Pressure Vessel Handbook and it offers the following for a 2:1 ellipsoidal head in terms of outside dimensions
t= PD
2SE+1.8P
That equation is the same as what's derived from Appendix 1, 1-4(c) and IS NOT the first equation, as you suggest, that I listed above from the L-1.6.1 example.
That same handbook offer this for a hemi. head (OD)
t= PR
2SE+0.8P
Which IS NOT the second equation I listed above.
Lastly, the third equation I listed above is for what I stated in terms of inside dimensions and IS NOT for an OD circumferential seam as you suggest.
I guess what we can agree on is that the handbook does spell most of these equations clearly.
RE: Sec. VIII Div. 1...L-1.6
i messed it up
RE: Sec. VIII Div. 1...L-1.6