Kettle-type heat exchanger saddle
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What needs to be considered in the calculation of the saddle for kettle-type heat exchangers? Should it be calculated only based on the supports of horizontal containers?
Saddle calculation is mainly about stiffness calculation! Designed according to specific circumstances!
I calculate it based on the distance from the saddle to the small end cap, taking into account some additional loads as well. I’d also like to hear how others calculate it specifically. . .
To be honest, it’s tricky; some saddles are located on the major and minor heads, which makes many standard calculations less effective. Moreover, the moment-shear diagrams are also difficult to work with. Finally, in the case of fixed tube sheets, it’s actually more difficult, as the heat exchange tube bundle possesses overall stiffness, which offsets part of the bending moment
The supports of kettle-type heat exchangers are usually arranged asymmetrically. The mass ratio of the kettle body to the tube side is relatively high, so it is necessary to calculate the load-bearing capacity of the supports themselves, as well as the strength and stability of the kettle body. It can be calculated as an asymmetric equipment with a double-saddle horizontal vessel, considering the tube bundles and similar elements as concentrated loads.