A mast, spar, or tall frame, supported at the top by stays or guys, and usually pivoted at the base, with suitable tackle for hoisting heavy weights, such as stones in building.
The pyramidal structure or tower over a deep drill hole, such as that of an oil well (also called an oil derrick .
A single spar supported by stays and guys, to which a purchase is attached, used to hoist cargo when unloading a vessels.
Swinging spar for moving cargo.
A tower-like load-bearing structure, usually of bolted construction. In drilling, the standard derrick has four legs standing at the corners of the substructure and reaching to the crown block. The substructure is an assembly of heavy beams used to elevate the derrick and provide space to install blowout preventers, casingheads, etc. Because the standard derrick must be assembled piece by piece, it has largely been replaced by the mast, which can be lowered and raised without disassembly. The derrick is used to raise and lower equipment (pipe, casing, etc.) used in the drilling and testing of a well.
An apparatus for lifting and moving heavy weights. It is similar to the crane; but differs from it in having the boom, which corresponds to the jib of the crane, pivoted at the lower end so that it may take different inclinations.
a framework erected over an oil well to allow drill tubes to be raised and lowered
a simple crane having lifting tackle slung from a boom
a lofty, portable, crane-like structure used on land and water for lifting enormous loads
an apparatus consisting of a mast or equivalent member held at the head by guys or braces, with or without a boom, for use with a hoisting mechanism and operating ropes
an offshore rig established for the purposes of drilling and dredging to pumping and piling
a steel framework holding the drilling machinery in place over an oil well
a tower for hoisting earth drilling equipment such as for water or oil pumping
The pyramid of latticed steel mounted over the bore hole and is used for both drilling and servicing purposes.
Boom arm for cargo behind the forward mast.
A device for hoisting and lowering heavy weights, cargo, stores, etc.
Boom arm of a ship's crane.
A tall, metal framework over a drilled oil well that is used to support drilling equipment or hoist and lower lengths of pipe.
a boom with tackle for handling cargo.
Lifting equipment on board a conventional vessel for loading and discharging cargo, consisting of a post attached to the deck and an inclined spar.
Steel structure mounted over the bore hole to support the drill pipe and other equipment which is lowered and raised during drilling operations.
a boom or spar used for cargo handling; pivoted at one end to a mast or strong point on deck, the free end can be swung and lifted using a combination of wire ropes, winches and blocks to hoist or lower cargo
A load-bearing tower-like structure over a natural gas or crude oil well that holds the hoisting and lowering equipment for drilling, testing and reworking wells.
Load-bearing towerlike framework over an oil/gas well which holds the hoisting and lowering equipment.
The tower-like structure that houses most of the drilling controls.
the steel structure which provides support for drilling equipment. The derrick is used for raising and lowering drillpipe and casing in and out of the well.
The visible part of an oil well; also known as a mast.
A hoisting device, usually made up of a guyed mast, a boom hinged to it, and pulley ropes.
The structure used to support the crown blocks and the drillstring of a drilling rig. Derricks are usually pyramidal in shape, and offer a good strength-to-weight ratio.
(1) Large apparatus used for lifting and moving heavy objects. (2) A tall, A-framed structure used for supporting drilling machinery. (3) Crane with a boom or jib.
A derrick is a lifting device composed of one mast or pole which is hinged freely at the bottom. It is controlled by (usually 4) lines powered by some such means as man-hauling or motors, so that the pole can move in all 4 directions. A line runs up it and over its top with a hook on the end, like with a crane.