Reading a Crane Load Chart

Reading a Crane Load Chart
3/21/2016 6:12:39 PM

A crane’s load chart is the key to its proper operation. In order to use the crane with maximum efficiency and efficacy -- and to avoid failures and accidents, the load chart must be consulted and accurately translated.

Never take for granted that you already know the capacities for a particular crane -- even if you’ve worked with a very similar model before. Always check the load chart for specifics.

As they say, an ounce of prevention is worth a pound of cure. Reading the chart should be regarded as an important and necessary first step in the process of operating a crane.

 

Components of a Load Chart

 

The purpose of a load chart is to give you an exact readout of the crane’s capacities and features. Understanding each section and knowing why these data are important is imperative. The following is a brief overview of the sections most commonly found on crane load charts.

 

  • Dimensions - This section tells you the exact dimensions and weight of the crane. This is necessary information in determining the type of trailer to be used in transporting it. You’ll also find information about capacity with fully extended outriggers. This data is also imperative because if you must operate in a tight space with partially retracted outriggers, lifting capacities will change.

 

  • Lift Capacity - The capacity section will help you determine what the crane’s capacities are with the boom extended to a particular length. This is key, as any change in boom length and height will affect maximum load capacity.

 

  • Lift Range - Consult the lift range chart to figure out exactly how much boom length is needed to lift your desired load to a particular height.

 

  • Line Pull - This section contains data for using the winch on a crane. Find the type of line you’re using and use the chart to find the max weight capacity, as well as max line speed allowance.

 

  • Area of Operation - This graphic will specify the so-called operational quadrants, indicating the areas where no loads should be handled. Use it to determine the limitations and optimum load positioning for your work area.

 

  • Crane In Motion - Find the in-motion load capacity for your crane here. This chart will show the maximum weights allowable while creeping and moving at faster speeds, as well as max boom angle and length for given speeds and weights.

 

Additional Information Found in Load Charts

 

Many load charts will contain other information, too. For example, some will have a chart section dedicated to proper counterweight configurations. Some others have tipping capacity information for using the crane with partially extended and even fully retracted outriggers.

You may also find a strength readout discussing the limitations of structural materials. There is usually a substantial set of footnotes to accompany a load chart, too. This is an important resource, and should never be skipped over. The footnotes serve to provide guidelines and clarifications for proper chart reading. Footnotes are written in reference to a particular make and model of crane, and are not universal.

 

Always conduct a thorough read-through of the load chart before transporting or operating any crane. Operating outside the parameters specified in the chart is dangerous and can result in expensive equipment failure, injuries, and even fatalities.

Remember that several factors, such as unlevel ground, affect the actual capacities of a crane. When in doubt, consult a trusted industry professional for help.

 

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