Derrick Crane

Much like a crane, a derrick is used for moving materials vertically and horizontally, comprised of a hoisting mechanism and pulleys or sheaves to create a mechanical advantage to lift large loads. Unlike a crane, a derrick usually has a vertical stationary mast extending from a base and a moveable boom.A derrick is the structure over an oil well which supports the drilling equipment and allows it to be lifted into and out of the wellbore. A derrick is a wooden or steel structure built over a well site to provide support for the drilling equipment and a tall mast for raising and lowering drillpipe and casing.