What are the four basic lifting principles that govern a Cranes mobility and safety?

The four basic lifting principles that govern a crane’s mobility and safety during lifting operations are leverage, structural integrity, stability, and center of gravity.

How cranes gain stability during lifting a load?

Provided the ground is capable of supporting the load, a crane can be made more stable by moving the tipping axis further away from its center of gravity. The extra stability gained by moving the tipping axis can then be used to carry larger/heavier loads.

What are the most common types of crane accidents quizlet?

OSHA has identified the major causes of crane accidents to be boom or crane contact with energized power lines (nearly 45% of the cases); overturned cranes; dropped loads; boom collapse; crushing by the counter weight; outrigger use; falls; and rigging failures.

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What guidelines should you follow when using a crane with outriggers?

  • If a crane has outriggers they should be used on every lift.
  • All outriggers on a crane must be used if an outrigger load chart is being used for calculating load capacities.
  • Even on ideal, solid ground always use outrigger floats or mats.
  • Use of a crane’s outriggers is your choice.

Which of the following must the operator take into consideration when determining the load rating?

An operator must take wind conditions into consideration when determining the load rating of a crane.

What are the 4 lifting principles?

The four basic lifting principles that govern a crane’s mobility and safety during lifting operations are leverage, structural integrity, stability, and center of gravity.

What must you know when using a load chart?

The load charts are specific to the make, model and configuration of a specific piece of equipment. Don’t forget to include adjustments for buckets, boom extensions, load blocks, hoisting rope and other attachments that will alter the lifting capacity of the crane or equipment used to perform the lift.

What is the most dangerous factor among crane accidents?

The most common cause of fatalities is workers or bystanders who are struck by an object that falls from the cranes. Other causes include being run over by a crane, falling from a crane, and electrocution.

What are the most common types of crane accidents?

OSHA’s analysis of crane accidents identified the major causes of crane accidents as:

  • boom or crane contact with energized power lines (nearly 45% of the cases)
  • under the hook lifting device.
  • overturned cranes.
  • dropped loads.
  • boom collapse.
  • crushing by the counter weight.
  • outrigger use, falls and rigging failures.
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What must be done before operating a crane?

Make sure the crane is suitable to lift and travel the load. … Visually inspect the crane before use. Make sure all loose materials, parts, blocking and packing have been removed from the load before lifting. Remove any slack from the sling and hoisting ropes before lifting the load.

Who can operate a crane?

Operators of most cranes above 2,000 lb. capacity when used in construction will need to be either certified by an accredited crane operator testing organization, such as the National Commission for the Certification of Crane Operators (NCCCO), or qualified through an audited employer program [§ 1926.1427(a)].

How do you calculate the ground pressure of a crane?

Simply divide the maximum outrigger load by the allowable ground bearing pressure to determine the pad area you need. Example: Maximum outrigger load = 100,000 lbs. Allowable ground bearing pressure = 3,500 psf. (100,000 lbs / 3,500 psf = 29 ft2 of area).

What part of the crane is used to lift and lower the load?

Hoist – A mechanical unit that is used for lifting and lowering a load via a hook or lifting attachment.

What types of power does a Category 1 or 4 Crane generally use and what is its source?

Category 1 and 4 Crane Power Types Category 1 and 4 cranes generally use electric or hydraulic power that is supplied by a diesel engine. A collector ring system conveys electrical current from the revolving portion of the crane to the lower crane structure.

When it is difficult for an operator to determine?

When it is difficult for an operator to determine power line clearance by visual means, an observer is not necessary.

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What is the point in the object around which its weight is evenly distributed?

Center of gravity: The center of gravity of any object is the point in the object around which its weight is evenly distributed.

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