Seeking help with the lifting of towers made of composite steel plates
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Could everyone please help? I’m reading the chapter on tower equipment in the book \"Comprehensive Handbook of Chemical Equipment Design\", and there is a description regarding the installation of lifting lugs on towers: \"When the tower body is made of composite steel plates or stainless steel plates, while the skirt is primarily made of ordinary steel plates, the lifting lugs should be welded to the skirt.\" For tower structures made of composite steel plates, this prevents the two layers of steel plates from separating ； For stainless steel towers, it is also possible to save stainless steel material, while it is easy to ensure the quality of the equipment. The lifting lugs are welded to the skirt base; during lifting, clamps should be installed at an appropriate position on the upper part of the tower to adjust the loading conditions and prevent the rope hooks from coming loose from the lugs. ” I am currently designing a regeneration tower that is 34 meters high and 1.8 meters in diameter, using composite steel plates. I’m not sure how to handle the design of the lifting lugs; I have no experience in placing lifting lugs on the base of such towers. I wonder whether other companies that use composite steel plates for their towers also place lifting lugs on the base and how they handle the lifting process. Please, everyone, help out! ! Thank you all in advance! ! Thank you!
The problem is far from that serious; we see shaft-type lugs welded onto the towers of stainless steel composite panel equipment quite often. Currently, there are no issues with the bonding strength between the composite layer and the base layer. If one has to worry even about the lifting equipment, then surely the cylinder body cannot be rolled, nor can the end caps be stamped or spun?
Don’t worry too much about it. Of course, if the sheet is very thin, it will need to be thinned out appropriately at the lifting lugs
Cylinder base layer 12, coating layer 3. I originally installed lifting lugs on the upper part of the cylinder and also carried out reinforcement work, but after reading this section of the text, I got confused again. Thank you all! I’ll get in touch with the lifting company next week and ask again.
An axis crane is installed on the cylinder, and a tail crane is placed at the skirt foundation ring; this should have little impact.
I agree with the views of those above. However, the thickness of the tower is relatively small; pay attention to the calculation of local stresses
Thank you all, guys! ! ! Local stress is currently being calculated!
For titanium-steel composite plates, it is indeed necessary to pay attention to this issue: when the wall thickness of the plate itself is not very large, deformation during lifting may cause the internal cover plates to fall off. I worked on a unit that was 45 meters long with an outer diameter of 3200X(28+3); after it was lifted into place, the design firm hired by the client requested that a PT inspection be carried out on the area around the lifting lugs.