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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.
borehole well 2-inch (packer single pipe deep well pumps) and 4-inch (twin pipe deep well pumps): flows can be provided from as deep as 50 metres, the pump being installed at ground level, thus making servicing easier.uction Capacity down to 50m depth (underground, as far as 50 metres below the level of the installed pump and while the pump sits aboveground!).Deep Well Jet Pumps are not restricted to well or borehole application.