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Safety

Two-Blocking Damage Prevention
25 March 2014

We have noticed a dangerous situation occurring amongst folding boom crane owners and operators. Folding booms equipped with winches require a device to prevent two blocking.

Wording of OHS regulations references that the requirement for anti-two block devices was repealed in 2006. This change only applies to the wording.

BC OHS regulations require articulating (folding) boom cranes to adhere to ANSI / ASME B30.22-2005 which states that folding boom cranes equipped with a winch must be equipped with a feature to prevent damage from two-blocking.

This hazard alert from WorkSafe BC June 2012 describes the dangers to workers and equipment from two blocking: Hazard Alert: Worker struck by load after articulating boom crane "two-blocks"