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In practical use elevators are highly stressed components and require regular careful inspection. In practice, sets of elevators and a spare duplicate are required on-site for general operations. Their failure almost always stops operations.
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To latch around a piece of pipework a set of elevators need a precise internal diameter, with an appropriately profiled shoulder to accommodate the lower profile of a tool joint. The latch mechanism has to prevent opening under
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loads of up to hundreds of tons. For some purposes (casing elevators, and loading pipe into and out of the derrick), the elevators also need to resist cross-axial loads of the weight of the pipe joints.
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