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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.
If the pump is installed with rigid galvanized pipe, you will need a derrick and winch to lift the pipe assembly out of the well, and a method of securely holding the assembly suspended in the well casing while you unscrew and remove each 20â length of pipe.tep Four â Remove pump from well. The person who will do the actual pulling should stand directly above the well to lift the discharge piping straight out of the casing and the other person should stay with the top end of water pipe and guide it to where it can lay down as you pull.