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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.
The hook should be located below the service weatherhead not more than 24 inches away. How high can the pipe for my mast be over the roof before I need to install a guy wire for it? If the pipe of your mast is more than 30 above the roof, it must be supported with a guy wire. This wire is used to offset the pull from the weight of the CMP cable coming in from the pole.