Usually a customer would contract a third party that does nothing but periodic maintenance, torquing etc., while the equipment is in use. These guys are trained and well qualified. The guys that did some 3rd party load testing on the buildings I've been working in would do this stuff as well
The Veternarian School at NC State does this. There's a lot of R&D going on, and a lot of money tied up in this stuff so they pay a contractor to come out and do all this stuff hot, to avoid screwing up some high dollar experiments, and to keep everything running in optimal condition.
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