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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.
Re: Mixer Truck Question. I have a crane on site and can use a bucket. I'm not going to spend the $1600 extra for a pumper truck so thats out of the question. The only other problem is how to place the concrete at the start of the pours without dropping it eight feet. The piers will be 2' x 3'6 x 8' high, and of course dropping redi mix over 3 or 4 feet will cause segregation of the mix.