For tower-type equipment, the tail lifting lugs cannot be designed at the foot bolt reinforcement plates; they can only be placed on the skirt base cylinder?
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For many tower-type equipment, it is not possible to design the tail lifting lugs at the location of the skirt base bolt reinforcement plates; they have to be designed further up on the skirt base cylinder. However, in this case they are no longer AP-type tail lifting lugs, as there is less welding required for the upper and lower plates. Moreover, the capacity of the top plate-type lugs is too low to meet the requirements of tail lifting lugs for large tower-type equipment. So how should I design my tail lifting lugs when they are to be placed on the skirt base cylinder? How to choose shims, and how to weld the lifting lugs to the shims?
You could also consider installing symmetrical tubular shaft-type lugs
When using a tubular shaft-type lifting lug for lifting, a balance beam is also required; moreover, the tail cable will come into contact with the equipment later on, which is not good.
Increase the specifications of the lifting lugs, and check the local stress using the rectangular attachment; the force acts in two directions, with the component along the axis of the equipment generating a bending moment.
Then one needs to calculate it oneself. It is placed between the base ring plates and the cover plate because these two ring plates can **increase the cross-sectional area, thereby enhancing the stiffness and stability of the skirt. If it cannot be placed between these two, then internal support within the skirt base should be considered. Generally, the thickness of the skirt base is not very large, so it is necessary to calculate whether there is sufficient rigidity during lifting; many books on lifting procedures provide calculations for this purpose, or else one has no other choice but to rely on guesswork.
Could you recommend some books on related lifting techniques? I really can’t find any!