Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1981-02-11
1984-03-06
Taylor, Billy S.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
173 11, 175 27, 254275, 254276, 254375, 254379, 303 16, 340665, 340666, 364555, 364562, B66D 148, E21B 1900
Patent
active
044349718
ABSTRACT:
The method and apparatus for preventing runaway lowering of a hook block in an oil drilling rig characterized by monitoring the instantaneous values of hook load and speed and using these values together with parameters associated with the rig drawworks to calculate an energy value which must be dissipated during a braking stop by the drawworks brake. The brake or an emergency brake associated with the drawworks is automatically actuated when the calculated energy value reaches a predetermined value representative of the maximum energy absorbing capability of the brake. The brake may also be automatically activated when the position of the hook block reaches predetermined upper and lower limits. The processor associated with the system also calculates a hoist value representative of the normal energy dissipating rating of the brake and activates an alarm if this value is matched by the calculated energy value for a particular load and speed, and a second value representative of the maximum energy dissipating capacity of the brake for emergency stopping, and activates the brake if the second value is matched by the calculated energy value for a particular load and speed.
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Armco Inc.
Taylor Billy S.
LandOfFree
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