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To circulate mud or fluid through the drill hole, rig derrick equipment and operate pumps.

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Crown blocks should be installed and bolted to the posts at the tops of derricks.
Using portable mixers, weigh clay and mix it with water and chemicals to produce drilling mud.
Pulleys and blocks are used to connect cables.
Prepare mud reports and provide personnel instructions on how to handle any chemical additions.
On the ends of the hoisting cables, clamp holding fittings.
Supervise crew members and help them in their training.
Pumps, muck tanks, and other associated equipment must be repaired.
Harnesses and platform climbing devices are used to position and align derrick components.