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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.
Pre-drill two 5/16 inch holes through both the conduit or pipe and the back of the box. Use 1/4 inch bolts for anchoring the box to the pole. The drilling can be done before placement in the field. Wrap two pieces of pipe strap around the pole and screw into the back of the box on either side of the pole.Secure another small piece of pipe strap to the back top and bend it down into the pole to keep the box from turning. Place two electrical conduit hangers around the pole and screw into the box. 10 foot piece of 3/4 inch EMT electrical conduit pipe can be purchased for a reasonable price. It will then need to be cut down to a length of approximately 8 feet, to place 2 feet of pipe in the ground and 6 feet of pipe above. The electrical conduit is zinc plated and will keep its slick surface for many years.