Wrapping large storage tanks - GIFs

Wrapping large storage tanks.

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Previously:

https://www.homemadetools.net/forum/...723#post197935
https://www.homemadetools.net/forum/...422#post196746
https://www.homemadetools.net/forum/...341#post192485
https://www.homemadetools.net/forum/...127#post191614
https://www.homemadetools.net/forum/...065#post191420

Do they apply the resin in another step? Usually these winding operations (on a much smaller scale) run the fiberglass filament through a resin bath, squeegee off the excess and then apply to a mandrel to form the cylinder. I'd love to see how they extract the form from a cylinder that size!

A small shop I worked for built CNC automated winding machines. Largest maybe 10' diameter cylinders about 20' in length. There are limitless combinations of each, depending on how the vessel will be transported and used.
Many were gas bottle and stock tank sizes, none of those use a mandrel, beside a threaded neck or spout.
It's like meshing your fingers, two or more pairs of roving wet with resin (countering filaments) are pulled onto the rotating neck, program creates the blend into vessel body, and rounded base. It's quite fast; centrifugal force and rapid traverse of filament being fed holds it self up; usually. Inside isn't straight walled like a pill bottle, the taper supports extending outside perimeter.

Similar to watching a potter use a wheel, raising a clay vase. That was inspiration for filament winding. Like the video of winding rebar reinforced concrete piers, larger containers almost the same, but a carriage pulls material and does the bias pattern. I expect examples like above start on a large ring, thicker to contain weight, and vertical frame of rod.