Expert article

Side pulling: what is it, and how can we prevent it?

Konecranes crane in facility

In normal operation, overhead crane hoists are designed to lift an object at a vertical angle. A side pull is when a portion of the hoist acts horizontally, such as when the hoist lifts an object that has not been placed directly underneath it.

 

By Randy Flippen, Konecranes Technician

 

When I cover the subject of side pulling in my crane operator training courses, I always tell my students that if someone tells them to do a crane pull, then they are not a responsible party. That’s because side pulling can be damaging to the hoist—and more importantly, it can cause a dangerous situation for any nearby personnel.

 

Side pulling can lead to premature rope failure

When you perform a side pulling action on a crane, you are pushing it past its mechanical limitations. The extreme amount of stress on the crane can cause a wire rope to snap—instantly and without warning. Needless to say, this could cause a very dangerous situation for any nearby personnel, as the wire rope could whip through the air; the load on the crane would swing vigorously and could potentially be dropped.

Unfortunately, side pulling is not an uncommon situation to observe. In fact, a fair portion of the damage I observe as a technician at customer sites is because of side pulling. Side pulling is also dangerous to the equipment itself. It can damage every aspect of the crane, especially the hoist and trolley. It causes the wire rope to dig into the metal of the trolley, and it can add wear to the drums.

Side pulling is like trying to use your car as a pickup truck—it’s not going to last. You will have more maintenance issues, and it will wear out quickly. If a load is lifted more than a few degrees off-center, it multiplies the stress applied to the wire rope. This is very dangerous and can cause premature rope failure.

 

Train crane operators on the dangers of side pulling

Side pulling is an issue that starts and stops with crane operators. Crane operators need to be properly trained, and they need to retain what they’ve learned. For each and every lift, crane operators need to be aware of the dangers of side pulling and take extra care to ensure that the crane will lift vertically, not horizontally. Maintenance and plant operations managers need to be aware of these issues and work as a team to prevent safety incidents related to side pulling.

 

Consider a Side Pull Prevention retrofit

Side Pull Prevention from Konecranes has been designed to stop hoisting motion when side pulling is detected. The Side Pull Prevention kit can be retrofitted to various types of cranes to prevent operators from any hoisting attempts that are not vertical.

 

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