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Fixed tubesheet with hub welded to shell

Fixed tubesheet with hub welded to shell

Fixed tubesheet with hub welded to shell

(OP)
For fixed tubesheet with hub welded to shell(Refer to Fig. UW-13.3),
If Allowable stress of tubesheet is lower than allowable stress of shell,
Shall Hub end thickness be checked as per UG-27 consider hub as cylindrical shell Or May hub end thickness be equal to shell thickness?

Please reply from your experience and knowledge.
Please send me information to solve this problem?
b5quaj@hotmail.com



RE: Fixed tubesheet with hub welded to shell

See UG-34,Appendix 2 for the hub. See Appendix AA for the tubesheet. Talk to your AI.

RE: Fixed tubesheet with hub welded to shell

(OP)
As an example,

I determined fixed tubesheet thickness as per TEMA.
And This tubesheet has hub to be welded to shell.
But allowable stress of tubesheet is lower than allowable stress of shell.

How should I determine hub thickness to be butt-welded to shell? by UG-27 or by shell thickness?

Is it correct to consider hub of tubesheet as cylindrical shell?

RE: Fixed tubesheet with hub welded to shell

I think that you should consider the hub as a cylinder and calculate it per UG-27.
Of course this is not really necessary from a strength point of view, but as I don't see this case treated by code formulae, I think you have no choice.

prex

http://www.xcalcs.com
Online tools for structural design

RE: Fixed tubesheet with hub welded to shell

IMO-There are more things a work here. See Appendix AA-2.5

RE: Fixed tubesheet with hub welded to shell

deanc,
Point AA-2.5 deals with bending + membrane stresses in the longitudinal direction only, and is therefore unrelevant to circumferential stress checking.
Of course the check of circumferential membrane stress due to pressure only is a prerequisite to any other check: hence I maintain my point.

prex

http://www.xcalcs.com
Online tools for structural design

RE: Fixed tubesheet with hub welded to shell

prex:My concern is that there is more going on then meets the eye(been doing this for too long,suspicious). Down and dirty I agree with you. Think this design needs more attention.

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