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points of hidden wear, manufacturers have constructed the rotary
swivel to permit complete overhauling at all points of wear on the
derrick floor actually in minutes.
To comprehend this wear and its correction, we must look at
the principal parts involved (Fig. 9.2).
Figure 9.2 – Main parts of swivel
These are the bail, bonnet, gooseneck, and body, upper and
lower bearings, stem and wash pipe. The body is usually made of
steel casting; it has a grease filled protective housing for the main
bearings.
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