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Some groups require a Professional Engineer to review lift plans for any lift above 95 percent. Keep in mind any critical lift criteria that your company may have when sizing a crane.
#Crane lift wind speed limits full
However, if the weight of the module is known to be an actual weight, then using the full chart of the crane should be a possibility. If the module weights are all estimated, then it would probably be prudent to not select a crane that is at 99 percent of its chart when picking the module. Are the weights of the loads estimated weights or actual calculated weights?įinding out how the weights were determined is more about knowing what risk to take when sizing the crane than the loads themselves. It is important to walk thru each type of lift to made with the particular crane and having a rigging concept prior to selecting the crane. There should be an adequate allowance for the rigging weight when sizing a crane in the proposal stage. The overall weight of the rigging is also a concern since it is another deduction from the crane capacity. The height of the boom tip is an important factor because it dictates your capacity, wind speed limits, the amount of crane rope deduction required, and minimum radius. If spreader bars are to be utilized or if the module is very wide, the rigging will have to be fairly tall and therefore increases the overall headroom. When I mention rigging, I’m not concerned with the exact size of the rigging, but more with the concept, height, and weight of the rigging. What type of rigging will be required to lift the module? It is important to note that just because the crane is capable of lifting 200T at 50 feet, does not mean it will have the ability to set 10T at 200 feet. You may also want to refer to the wind charts to see if changing the configuration around a bit might give you a better allowable wind speed to work in. Be sure to go back and revisit other lifts you have to make to make sure this set up can make those lifts. Tying in with figuring out how far your crane needs to reach is: what capacity do you require at that radius? After figuring this out and determining what size crane and configuration you need. What is the weight of the module at the farthest reach point? It is important to keep an eye on your minimum and maximum radii as you develop your plan. Every crane chart has a minimum radius and it sometimes comes with conditions. It is also important to keep in mind that in most cases, the farther you have to reach out reduces how close you can pick up a load. This in turn reduces the overall capacity of the crane. The farther the crane has to reach, the more boom and/or jib will be required to make the reach. This question will come with other questions such as: Does the crane need to reach over a building? Is there critical infrastructure in the load swing path? Are there powerlines in the vicinity? What is the farthest the crane has to reach?įiguring out the crane reach may actually set the boom and/or jib configuration of the crane. Another option is to increase the length of the boom to keep from getting “boom bound”. If a very large module is to be picked, then a fixed jib or even a luffing jib may be needed to keep the module away from the boom. Below are some more questions that should be asked before selecting a heavy lift crane: What are the dimensions of the largest module that has to be set?Īsking the first question about dimensions will give a hint as to whether a jib attachment may or may not be needed at the top of the boom. Usually the first question asked is: What is the heaviest lift? Although this question is very important, it is not the only question that should be addressed. Most of these questions revolve around the loads that will have to be picked up and set down, so we will start the questioning there.
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There are many questions to ask when first looking at a job that requires a heavy lift crane.