How to insulate the lower head of towers. . .
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The main thing is how to fix the outer iron sheet. . . .
It depends on the form of insulation? If it is polyurethane foam, just spot weld some steel nails from the head to buckle the aluminum plate or the iron sheet you mentioned.
You need aluminum skin. Nowadays, many insulation materials are made of aluminum. Just use nails to connect the aluminum sheets.
Before insulation, first spot weld a few small flat irons on the equipment as keels, and then apply insulation material. Finally, connect the protective layer (aluminum plate, stainless steel skin, galvanized steel, color steel, etc.) to the keel with rivets or self-tapping screws.
The climate conditions here are not suitable for aluminum, so iron sheets are used. . .
The equipment itself is a tower type and welding is not allowed. . . The lower head is in the skirt seat. . . There is also a nozzle on the lower head. . . I wonder if I can make a flat bracket, weld it to the skirt, and then fill it with insulation cotton. . . Fix the iron sheet on the bracket. . .
"Before insulation, first spot weld a few small flat irons on the equipment as keels, and then apply insulation material. "Generally, insulation nails are welded to the bottom head of insulation tower equipment. After installing the felt insulation cotton, we can pull wire or steel straps and other binding materials from the welded insulation nails at the edge of the tower (usually π-type welding) to weave it. Aluminum skin is not needed on the outside, because the name implies that the aluminum skin protective layer is only to protect against impact damage, and a moisture-proof layer can be used to prevent moisture.
You can refer to the structure on pages 26 to 29 of HG 20652-1998 Tower Design Technical Regulations.
Watermelon-shaped thermal insulation iron sheets are used for thermal insulation. There are downstream seams between each iron sheet to prevent rainwater and other downstream water from flowing into the insulation layer. The iron sheets are fixed with self-tapping screws.