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Inclined pressure vessel design

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ilovechickens

Mechanical
Aug 23, 2004
40
I am designing a horizontal pressure vessel on saddles that has to be installed on an incline for operating purposes (approx 15 degrees). I can either allow for the angle by make the saddles varying lengths or have the foundation sloping.

Anyone got any pointers re which way is the best to go?

Typically all code design info is for vertical or horizontal vessels. Can anyone point out any pit falls during design I need to watch out for when considering an inclined vessel?

Thanks Guys
 
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As far as pressure boundary goes, I don't think Sec. VIII, Div. 1 makes any distinction about orientation. It may make some difference on design of any internals to insure proper function.

The company I work for once did some shell & tube exchangers that had a slight slope 1-2 deg. Of course all the nozzles (and lots of them) were square with the world. It was a mess for the draftsmen.

If the nozzles are inclined, you would have to use the finished opening size in reinforcement calculations if calculations are required, but that's the only difference I can see.

Don't know about foundation design, but to design saddles of different lengths is no big deal.
 
If you slope the vessel, then the supports either have to be vertical or sloped to match the vessel. If vertical, you have a support condition at the shell that is somewhat different from what all the design data is for. If sloped, you'll get some bending moments in the supports due to shear loading from the dead weight of the veseel.

Do you need access to the vessel? IE, if one end is 10' off the ground, will that cause anyone any grief? Or is it smaller than that?
 
Thanks for the words of advice.

Have decided to go for same length legs with the legs perpindicular to the vessel, and will have to allow for the bending moment in the saddle. Otherwise due to the length of the vessel (approx 14m) one saddle may well end up approx 2m higher than the other. We have been told we can have the ground sloped. Since we have to consider seismic design this appears to be the better solution.

No reason why we can't keep the nozzles square to the vessel, so will do so.

Regards

 
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