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The derrick supports the crown block and provides a place to stack pipe that is pulled out of the hole. The depth rating of the derrick is related to the size of the rig. The height of the derrick is commonly referred to in multiples of pipe joints (a joint of pipe is approximately 30 ft long). Rigs that can stack double joints of drill pipe are called double derricks, and those that stack three joints are called treble derricks. Part way up the derrick are the monkey board (3) and pipe fingers. The derrickman handles the top end of each stand of pipe from the monkey board during trips.
Tongs are the very large tools used on a derrick to tighten and loosen the drill pipes a â¦ nd collars etc. They are usually manipulated by the roustabouts during pipe changes or additions. Imagine a pair of grips that are at least 5 feet long and are tensioned by a winch operated by the driller on an oil rig floor .