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A Splittable block comprises a main block with two pairs of detachable sheaves and one pair of stationary sheaves. |
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| In this way the block uses 12,
8 or 4 falls, (picture right) thus reducing hoisting capacity
and increasing hoist speed. Splitting of the block is achieved by
detaching pairs of sheave blocks from the traveling block and attaching
them to the crown block. The splittable block is the result of years
of crane building experience and extensive research programs. Cal Dive's Q4000 now uses the splittable block on the Huisman MPT. |
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The splitting operation is performed with the traveling block in the top position using remotely operated hydraulic cylinders controlled from the drillers control panel. |
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| The unused sheave blocks are locked mechanically to the masthead by means of spring-loaded latches (picture above). The flexibility gained from this design is that traveling block speed can be increased up to 400% vs. being fully reeved as the hook load decreases during tripping operations. This greatly enhances the efficiency of the drilling operations. |
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