What kind of support is this?
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A few days ago, I saw some equipment at a factory; I found them quite interesting, so I’ve brought them up for discussion. PS: The following only discusses issues related to the device itself, and does not pertain to any specific manufacturer or others. Figure 1. What kind of support is this? Why is there a hole in the middle? How do I calculate it? Figure 2. For this type of supported bearing, is it acceptable to raise it at the site in this manner? First, it is not fixed, and the seismic requirements cannot be met ； Secondly, visually, raising the pillars makes them appear a bit thin. Figure 3: Also shows elevated support brackets, with visible deformation to the naked eye
It’s a supported type; it’s normal to have no bolt holes for foot bolts – the manufacturer didn’t bother to provide them. Installation workers usually weld it in place, and any deformation might be caused by collisions. Judging from the picture, it should be a equipment operating at normal pressure; there is likely no calculation sheet, and no calculations have been performed.
Horizontal atmospheric pressure equipment should also be taken into account
It seems that the support of Figure 1 is made by welding two H-shaped steel members together
This leg is clearly shorter; pay attention to the valve marked with the red circle
There is a problem with both Figure 3 and Figure 2: the bottom valves; it seems that this factor wasn’t taken into consideration. Perhaps it wasn’t considered at all when setting the requirements. Secondly, the strength of the support materials is clearly insufficient; it’s not worth it for the manufacturer to save material in this regard. @Shutong @RedLee_ZZHI @PowerfulUltraman. @The wise are enlightened @Nut
By checking that the manhole is connected using clamps, it can be determined that this is a glass-lined horizontal storage tank. If welding gusset plates to the outer surface of glass-lined equipment according to saddle standards, it will prevent heat from escaping and affect the glass lining process. So only such pre-welded parts can be used; after the enamel firing is complete, those pre-welded parts are then welded to the bottom plate. The disadvantage of this connection method in photos is that the area of the cylinder’s load-bearing part is too small, but this generally isn’t a problem. Another issue is that the pre-welded components may make it difficult to shape the structure properly. I usually use a movable saddle; that is, no pre-welded parts are welded to the cylinder, instead a plate is welded onto the saddle pad, holes are drilled in it, screws are welded to both ends of the steel strip, and after going around the cylinder once, the screws pass through the plate welded to the pad, with nuts used to tighten them. Due to the limitations of the manufacturing process for glass-lined equipment, each manufacturer basically has to find solutions on its own. The standards do not provide clear or reasonable specifications regarding the method of joining supports or other accessories that need to be welded to the outer surface of the equipment.
I have also designed those elevation pads similar to those in Figure 2 and Figure 3, but I have never created ones that are this thin; the support bases used in them were not constructed according to standards, and it’s likely that the elevation pads were made by the users themselves.
The bottom valve does require space, but this can be compensated for by adjusting the base height; the additional structure is made using two channel steels
You guessed perfectly! During on-site verification, it was indeed a glass-lined tank. Could you provide a diagram of your structure?