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Derrick efficiency factor

Standard Derricks 501. Load Capacities 506. Design Loadings 508. Design Specifications 511. Maintenance and Use of Drilling and Well Servicing Structures 515. Derrick Efficiency Factor 521. [Pg.497]

Derrick efficiency factor (DEF) is often used to rate or classify derrick or mast structural capacity [1,7,8]. The derrick efficiency factor is defined as a ratio of actual load to an equivalent load that is four times the force in the derrick leg carrying the greatest load. Thus the ratio is... [Pg.521]

The derrick efficiency factor can be found for static (dead load) conditions and dynamic conditions. In this section, only the static conditions will be considered. [Pg.522]

See other pages where Derrick efficiency factor is mentioned: [Pg.521]    [Pg.522]    [Pg.522]    [Pg.521]    [Pg.522]    [Pg.522]   
See also in sourсe #XX -- [ Pg.521 , Pg.522 ]



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