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Crown block. A crown block is the stationary section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite and above the traveling block. [1][2] The combination of the traveling block, crown block and wire rope drill line gives the ability to lift weights ...
Crown block (#13) is the stationary end of the block and tackle. Degasser (not pictured) is a device that separates air and/or gas from the drilling fluid. It is typically mounted on top of the mud tanks. Derrick (#14) is the support structure for the equipment used to lower and raise the drill string into and out of the wellbore. This consists ...
A traveling block is the freely moving section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite (and under) the crown block (the stationary section). The combination of the traveling block, crown block and wire rope drill line gives the ability to lift ...
Drawworks. A drawworks is the primary hoisting machinery component of a rotary drilling rig. Its main function is to provide a means of raising and lowering the traveling block. The wire-rope drill line winds on the drawworks drum and over the crown block to the traveling block, allowing the drill string to be moved up and down as the drum turns.
ICD-9-CM. 23.41. MeSH. D003442. [edit on Wikidata] In dentistry, a crown or a dental cap is a type of dental restoration that completely caps or encircles a tooth or dental implant. A crown may be needed when a large dental cavity threatens the health of a tooth. Some dentists will also finish root canal treatment by covering the exposed tooth ...
Keystone (architecture) A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to bear weight. [1][2][3] In arches and vaults (such as ...
Jewel House. Coordinates: 51°30′29″N 0°4′34″W. Entrance to the Jewel House. The Jewel House is a vault housing the British Crown Jewels in the Waterloo Block (formerly a barracks) at the Tower of London. It was opened by Queen Elizabeth II in 1994 and refurbished in 2012.
The 2,492 cc (2.5 L; 152.1 cu in) 1JZ version was produced from 1990 to 2007 (last sold in the Mark II Blit Wagon and Crown Athlete). Cylinder bore and stroke is 86 mm × 71.5 mm (3.39 in × 2.81 in). [1] It is a 24-valve DOHC engine with two belt-driven camshafts and a dual-stage intake manifold.