Where would you expect to find a ‘Union Plate’ on a derrick rig?

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Asked on July 25, 2021
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Union Plates are employed on derricks which operate with a single span ‘topping lift’ as opposed to a ‘span tackle’, topping lift. The downhaul of the single span topping lift is shackled to the apex of the Union Plate, while the bull wire, and chain preventer are secured to the base of the plate. They are also employed to secure the runners and hook arrangement in a union purchase rig, where a triple swivel hook is not used.

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Posted by marinetales
Answered on July 25, 2021