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Summary Of: Derrick
The derrick type of gallows in turn got its name from... Another kind of derrick is used over... This is generally called an oil derrick and is a complex set of machines specifically designed for optimum efficiency... The derrick also controls the weight on the drilling bit... the derrick will apply less pressure as piping sections are added... This derrick will lower or heave cargo as both guys are veered or hauled... The Hallen derrick has a good purpose for e... The Velle derrick is quite similar to the Hallen but without use of outriggers... lcken derrick is used for very heavy cargo... This derrick can handle up to 300... This makes it possible to let the derrick swing through the posts to reach another hatch... If only one purchase is secured and the derrick is loaded with 137... In this way the derrick reaches a vertical position... A bullrope easily pulls the derrick to the other side until the weight of the cargo tips the derrick over... The union table is fixed again and the derrick can start its work on the other side... To tip the derrick over the gravity is here used again... A derrick helps pump oil in most offshore rigs... Encyclodia Page On: Derrick
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