Derrick crane foundation base plate installation first step. A derrick is a lifting device composed at minimum of one guyed mast, as in a gin pole, which may be articulated over a load by adjusting its guys. Most derricks have at least two components, either a guyed mast or self-supporting tower, and a boom hinged at its base to provide articulation, as in a stiffleg derrick. The most basic type of derrick is controlled by three or four lines connected to the top of the mast, which allow it both to move laterally and cant up and down. To lift a load, a separate line runs up and over the mast with a hook on its free end, as with a crane. Forms of derricks are commonly found aboard ships and at docking facilities. Some large derricks are mounted on dedicated vessels, and known as floating derricks and sheerlegs. The term derrick is also applied to the framework supporting a drilling apparatus in an oil rig. The derrick derives its name from a type of gallows named after Thomas Derrick, an Elizabethan era English executioner. Suscribe this channel for more videos. Like | Comment and Share Thank you #bmdiscoverymines #derrickcrane #installation
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Granite Block carrying and loading by darrick crane | loading in trailer | best capicity | derrick crane use in mines. subscribe | like | comment | share BM
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Photos: http://forev.net/CRANE?pid=1335024 The Derrick boom was disassembled by smaller boom and at last the smallest boom.
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