Two-Blocking

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The condition when the lower load block, hook assembly or fastline ball contacts the upper load block or boom-point sheave assembly.

Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Seventh Edition, December 2014. Global Standards

Source: API RP 2D, Operation and Maintenance of Offshore Cranes, Sixth Edition, May 2007. Global Standards

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