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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.
Now, as you arm out and boom down to center the pipe over the trench, you increase the lift radius to 20 feet and capacity plummets to 15,670 pounds. Then, as you touch the pipe to the trench floor, with the bucket's lifting eye now at 5 feet below grade, capacity is 14,500 pounds.