Saddles for atmospheric vessel
Saddles for atmospheric vessel
(OP)
I'm trying to design saddles for an atmospheric vessel. The saddles shall be as shown in this image:
http://www.cordivari.it/media/immagini/2212_n_serb...
how can I do? Is there a simple procedure to follow? tnks
http://www.cordivari.it/media/immagini/2212_n_serb...
how can I do? Is there a simple procedure to follow? tnks





RE: Saddles for atmospheric vessel
But these supports and the shell would not exhibit the same sort of stress distribution. It would seem that the load applied to the shell from the attachment of the "feet" is very localized. It seems that a local-type stress analysis would be appropriate. Such as WRC-107, EN-13445, or FEA, etc. Then the feet themselves need to be designed for the loads they are subjected to.
RE: Saddles for atmospheric vessel
sorry, but now I don't have software in order to apply WRC or EN or FEA. Is there a sort of template? Something that I can use for example. This one is only a tank vessel, not required the application of particular code (In spite of this, I use ASME VIII Div.1 for shell and head) or certification.
RE: Saddles for atmospheric vessel
If it is a one-off tank, you can very easily spend more engineering cost analyzing than what you save by your analysis, so it may be worthwhile to use beefier saddles just to avoid additional analysis.
RE: Saddles for atmospheric vessel
Increases in stress are to be expected particularly in the case of vessels with a ratio of wall thickness/diameter <0,005 whose contents are over 20 m3.
Regards
r6155
RE: Saddles for atmospheric vessel
You could size the thickness and size of the legs and weld using some simple conservative everyday engineering calcs to get an idea of what you need, however the design would really need to be proof tested by filling the first tank with water and simulating seismic/Wind etc. In other words, they need to be "designed by experience" or "designed using testing".