Hemi Head Connection
Hemi Head Connection
(OP)
Can anyone recommend a good reference for the proper joint design when attaching a hemi head to a cylinder?
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RE: Hemi Head Connection
Most fabricators go with UW-13.1(j) and match the centerline of the head with that of shell. The head will have cutback. Part of shell will be tapered and become part of head.
RE: Hemi Head Connection
That's how we normally make the joint, but, UW13.1 doesn't seem to specifically address hemi heads.
I'm just looking for a little enlightenment on the subject. Is that the only acceptable method of attachment?
Could you for example, not cut the head back and make the transition between shell and head thicknesses with weld metal?
RE: Hemi Head Connection
RE: Hemi Head Connection
Isn't this covered in UW-13(b)(3)?
I see nothing wrong with it provided all the requirements are met and the weld buildup isn't excessive... A good welding engineer should glance at the proposal.
jt
RE: Hemi Head Connection
RE: Hemi Head Connection
especially if a closing head and all weld done manually
RE: Hemi Head Connection
Tom,
I really don't understand your comment, can you possibly enlarge on it? Specifically, how could the transition be on the 'head side' of the tan line?
Thanks,
John
RE: Hemi Head Connection
What I was saying is that this figure shows the transition in thickness performed within the hemispherical geometry; ie: the cylindrical shell can't be tapered itself; at least, not to less than the required cylindrical thickness, within the "cylindrical geometry" that exists below the top head tangent line.
I have seen numerous hemi heads where the butt weld joint is an inch or two above the tangent line. This results in a hemi head that is not the theoretical 180° "hemi", but maybe 176°.
RE: Hemi Head Connection
RE: Hemi Head Connection
Thanks for the clarification.
John