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In practice, sets of elevators and a spare duplicate are required on-site for general operations. Their failure almost always stops operations. To latch around a piece of pipework a set of elevators need a precise internal diameter, with an appropriately profiled shoulder to accommodate the lower profile of a tool joint.
A paternoster in Prague Paternoster elevator in The Hague, when it was still in operation. A paternoster (/ ˌ p eɪ t ər ˈ n ɒ s t ər /, / ˌ p ɑː-/, or / ˌ p æ-/) or paternoster lift is a passenger elevator which consists of a chain of open compartments (each usually designed for two people) that move slowly in a loop up and down inside a building without stopping.
The schematic is a line diagram, not necessarily to scale, that describes interconnection of components in a system. The main features of a schematic drawing show: A two dimensional layout with divisions that show distribution of the system between building levels, or an isometric-style layout that shows distribution of systems across ...
Electrical Products Corp. was established in Los Angeles, incorporated on November 7, 1912. By 1923, EPCO had acquired the rights to the neon patents of neon light inventor Georges Claude and began the manufacture of neon lighting and signs. [1] In 1962 it was acquired by the Federal Sign and Signal Corporation.
Holeless hydraulic elevators were developed in the 1970s, and use a pair of above-ground cylinders, which makes it practical for environmentally or cost-sensitive buildings with two, three, or four floors. Roped hydraulic elevators use both above-ground cylinders and a rope system, allowing the elevator to travel further than the piston has to ...
Montgomery Elevator: Acquired by Kone, Canadian division in 1985 and U.S. division in 1994. Marshall Elevator: Sold to Otis; Schweizerische Aufzügefabrik AG; Thyssen AG: Merged with Krupp and became ThyssenKrupp in 1999, with subsidiary ThyssenKrupp Elevator AG; ThyssenKrupp Elevator AG announced in 2021 a name change and rebranding to TK ...
Wittur started its business with the production of elevator doors only and has developed itself over time to an enterprise offering complete elevators and producing a wide range of elevator components such as: [6] Elevator doors (car doors and landing doors) Lift machines; Safety devices (especially overspeed governors and safety gears) Cars ...
In the diagram, these are stands of drill pipe which are 2 or 3 joints of drill pipe connected and stood in the derrick vertically, usually to save time while tripping pipe. Drill string (#25) is an assembled collection of drill pipe, heavy weight drill pipe, drill collars and any of a whole assortment of tools, connected and run into the ...