Can the thickened section of the shaft-type lug be replaced with a reinforcement ring? ? ?
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It is a tower-type equipment with a total weight of 16 T, and inner diameters of 2500 and 1500. Lugs of typeAXB-300-18 should be used; the wall thickness is 8, which is insufficient. It is necessary to consider adding an additional reinforcing ring to the cylinder – how should the width of this ring be calculated? HG/T21574-2008 specifies calculation methods for the width of thickened sections in chemical equipment lugs and related engineering requirements; can this be used as the width for strengthening the tank body? How to choose the thickness? For the lifting lugAXB-300-18, the minimum required thickness of the cylinder is 18 mm; is it appropriate to use 12 mm for the reinforced cylinder? Should the reinforcement cylinder be welded to the original cylinder in a intermittent manner or fully?
The local stress at the shaft ears was calculated during lifting; as long as the calculations are satisfactory, you can choose the thickness of the cylinder as you wish
For this type where a reinforcing ring is wrapped around the cylinder shell, I’m not sure what method should be used for calculation
Just thicken the cylinder honestly; if standard reinforcement rings could be used, they would have been adopted long ago. There’s no need to go to the extra expense of thickening the cylinder
The kind of circling mentioned by the original poster might have been considered by designers, but there is no basis for such calculations. I also agree with what was said above; if lifting as a whole is taken into consideration, then that approach is feasible
Such equipment can be lifted without lifting lugs, by using the necessary fixtures.
Alas, the manager wants me to add lifting lugs; the cylinder has already been made, so it’s not possible to thicken it directly. I mean, I tried to contact the installation company to ask if it would be possible to work without lifting lugs, but my boss didn’t agree to it
For the thicker sections, the owner can choose a slightly thinner board thickness, but it’s still necessary to carry out local stress calculations to ensure they meet the requirements
A full circle of reinforcement (half ring) can be added; the thickness should be such that the thickness of the cylinder plus the total thickness of the reinforcement ring meets the requirements for the lifting lugs, or the local stress calculations come out satisfactory. If you’re not entirely confident, it’s advisable to leave some extra margin, after all, the equipment is relatively light in weight.
Thickening is mainly due to considerations of local stress. If it isn’t thickened, it’s equivalent to designing the lifting lugs oneself, and detailed calculations must be done