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https://3d-labs.com/product/davit-calculation-design/ A davit is used to secure the blind flange and keep it from falling , especially in heavyweights more than 25 kg. The blind flange has two handles for opening purposes (Fig. 16.45). The davit is integrated into the blind flange from one side and bolted with two nuts. The davit base is generally a permanent structural fixture on the roof of the building. It serves as the primary anchor point that provides support to the mast, arm, and the suspended platform that hooks over the edge of the building.
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