agree with told all above..

# Crane load calculation formula pdf

Postings made by forum users are personal opinions. IOSH is not responsible for the content or accuracy of any of the information contained in forum postings.

Please carefully consider any advice you receive. Need Clarity in the determining the Crane capacity- is it the appropriate to use crane rated capacity or the capacity from load chart corresponding to the boom length and radius of intended load?

I would imagine it would be the former, capacity from load chart corresponding to the boom length and radius of intended load. As the calucation would need to be based on an accurate figure from the load chart and corresponding to the required boom lenght, and Radius.

Simply working out the maximum calculation as far as the crane can be, serves no use or purpose at all for working out the required capacity as this "Maximum" figure may effect other calculations, for that particular lift, such as the Point load on the Out Riggers, etc. Take a peek at this pdf on page 14, for an idea on how different load calculations can vary between boom lenght and Out rigger point loads.

The question you are asking demonstrates that you do not have the knowledge you need in this area to be planning the lift.

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In the UK, there should be an appointed person and lift supervisor involved in the lift operation. They may be the same person and they will have the knowledge you need to plan the lift. As safety professionals, we cannot possibly know everything. The trick is recognising what you do not know and when to get the appropriate expertise in.

Lifting operations, when poorly planned can go horribly wrong. As others have stated, in the uk it is an Appoiinted person level 6 qualification who would undetake this task. Obv there are quite a few safety factors to be taken into account here but just one example is the safe working load at a given angle or length I think you need to email someone such as inspections myloler. Welcome Guest! The IOSH forums are a free resource to both members and non-members. Login or register to use them. Rank: New forum user.

Rank: Super forum user. Thanks for your valuable contribution Gerry.

Rank: Forum user. I agree with both responders. Use your experts, its what they are there for. A complete lift plan will also take you ground point loading into consideration. Again, just to reiterate, it is a complete seperate trade. Kind regards Angelo. Yes use the lifting chart, do not use the cranes rated capacity!!! You cannot post new topics in this forum.

You cannot reply to topics in this forum.Before a crane is rented, transported, employed or purchased, the crane chart must be consulted.

Everyone, from the crane operator, to the job supervisors, to even the sales guys have to know how to read a crane chart. It includes data for operation with the outriggers extended, transport weight, and steering dimensions. Knowledge of this information is especially critical if the crane will be working in a confined space, as the lifting capacity varies depending on whether the outriggers are extended. The transport weight below determines the trailer to be used, how to load the crane on the trailer, the route to take, and what permits are required to get it to the jobsite.

Along the top axis, the first number is the gross vehicle weight. In the other two columns, the arrows indicate the weight load for each axle depending on what additional accessories are loaded. In the legend at the top of the chart, you can see these ratings apply when using 6.

The distance is measured from the center pin of the crane to the center of the load.

Once you determine the distance, look on that line for the largest capacity; that will indicate how many feet of boom must be extended. In this case, it is 45 feet. While the Terex RT has a maximum capacity of 45 tons, lifts at any distance or height drops the maximum capacity dramatically. For that, a range diagram is usually included in every chart which illustrates how much boom length is needed to pick up and lift a load both at a distance and at height.

Consulting the range diagram, 69 feet of boom is required to make the lift. Lifts with jib lengths of 32 and 49 feet in addition to boom extension of feet are illustrated. With higher angles of lift, the maximum load capacity decreases. With a luffing jib, the angle can be automatically adjusted from the operators cab. With a fixed jib, of course, the angle is fixed.

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Here, the chart illustrates the total weight able to be picked up at a degree angle while stationary on wheels, the total weight being able to be supported both while slowly rolling with the load at a zero degree angle creepand the total weight able to be supported while moving at 2.

The column to the left again indicates the radius of the lift, the one to the far right, the maximum boom length each weight can be carried at. This website uses cookies to ensure you get the best experience on our website. Learn more Got it!There are a range of variables to consider when attempting to calculate what size crane is best suited for your project. Using our easy-to-use, multiple-choice crane size calculator for mobile cranes, you will be able to efficiently estimate the recommended crane size needed based on the weight of your item and the radius it will need to be lifted.

However, please bear in mind that no lifting exercise is the same and that only qualified Appointed Persons should have the final say in selecting the suitable crane size and type for your project. We are more than happy to assist you with this decision. This crane size calculator has been produced to allow you to estimate what you will require and to determine the logistical viability and costs associated with hiring our mobile cranes.

Our team are on hand to answer any of your mobile crane hire queries and would be more than happy to help. Please click below to contact us today. Crane Size Calculator.

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Back to previous. Cadman Cranes — Crane Size Calculator There are a range of variables to consider when attempting to calculate what size crane is best suited for your project.

Height of building or obstruction m. Centre of Crane to edge of Building obstruction m. Lift Radius centre to centre m. Required Load to Lift T. Lift Tackle in addition to item T.

Total Load to lift T. Angle of Boom Deg. Minimum Boom Length m. Minimum Vertical height of the Boom m. Notice: JavaScript is required for this content.

First Name. Last Name. Want to speak to a member of the team?Wide range capacity of double girder cranes offered. European crane design, cheaper china crane price. CE crane. For the safety of your workers and facility, overhead crane load testing is required by OSHA law to make sure lifting crane equipment working in proper order before coming into use. Generally, load testing of overhead cranes is required by safety regulation and standards to make sure the overhead crane is installed right according the designing specifications.

## Load Charts & Product Guides

You should be able to safely lift and move the load through regular motions. Hooks, hoist chains and wire ropes must be checked daily, but heavy or severe load tests should be inspected semi-annually or quarterly. And also all the load testing reports should be filed which can be accessed by the personnel who is in charge. If you want to know more about the 10 ton overhead crane project, please check our crane project case study by clicking at Overhead Cranes Serving in Steel Coil Plant.

In order to give you suitable overhead bridge crane safety solution promptly, please help our overhead bridge crane engineer to confirm the following information as much as possible: qPHHenan Dongqi Machinery Co. If you do not know about how to solve your overhead bridge crane problems, please feel free to leave us a message or email to sales cranesdq. The reply of our overhead bridge crane engineer will be given within 24 hours.

Get your custom overhead bridge crane solutions. All overhead cranes, gantry cranes, suspension cranes and jib cranes should be proof tested once every four years after original proof testing.

All overhead cranes, gantry cranes, suspension cranes and jib cranes should be proof tested and operationally tested after modifications and repairs. All the new and altered overhead cranes should be checked and tested with the following functions: Hoisting and lowering. Trolley travel. Crane running or bridge travel. Make sure the lifting gear to be used with the overhead crane in normal duties. Make sure all lifting attachments are marketed with rating load visually.

Check the previous and periodic test and inspection notes, deficiency reports to make sure all the necessary corrections and repairs have been made. Make sure all the safe working load of the overhead crane is clearly marked on the crane or on the tag on it. Make sure the crane runway and runway structure were designed to support the cranes and loads in all authorized operation configurations. Proper loads for the testing should be selected. The reeving configuration have to be bear in mind.

Proper ringing should be used for the load testing which must conforms to good rigging practice for lifting safety. Safety measures should be used to prevent personnel or vehicles to intrude into the overhead crane operating region.

All the persons related to the overhead crane load testing including the overhead crane operator, the riggers and the hand signal man have to know the load testing procedures and how the overhead crane load testing conducted. Inspect the overhead crane thoroughly, especially to the structural elements of the overhead cranes where the will be subjected to stress during the overhead crane load testing.

A visual inspection to the crane runway, track, powder conductors, collectors and switch gear should be conducted before the load testing.Multiple crane lifts can be tricky business. One source described two crane lifts as being more than twice as risky as single crane lifts with even more disproportionate increases in risk as more cranes are added. This is generally due to the load interaction between the cranes. To obtain this most basic piece of information for a multi-crane lift, three factors must be known first.

These are the load weight, the load center of gravity CGand in some cases, the load geometry. Of these three factors, the hardest to get is usually the CG. However, the load distribution cannot be calculated accurately without it and this must be impressed upon the owner of the load if the lift is to be done safely. Remember, if we guess at the CG location, we are guessing at the load weight which can lead to accidents. Calculating Load Share Once we have the necessary data, the load share for each crane can be determined.

Note that distances are measured to the lift lug holes from the CG. In this case, the relative height of the lugs and CG is not a factor in the calculations. As mentioned above, we are left to guessing its location. This might seem like a lot, but taking all measurements in feet for Figure 3, the discrepancy is only 6 inches. This is a difference of 8. Obviously, the worse our guess, the more inaccurate our assumed load distribution. Also, where the distance between the lugs gets smaller, the accuracy of our guess makes a lot more difference to our assumed load distribution.

Tipping Up The Load Once we begin tipping up the load, we may find that the load distribution between the cranes changes. How much the distribution changes will depend on the geometry of the load.

In Figures 1 and 2, the lugs are at different heights and if we drew a line between the lug holes, the CG does not lie on that line. When this situation occurs, the load distribution will change as the load tips up.The design of crane foundations is not an easy task as it involves safety risks that need to neutralize throughout the course of its service.

In doing so, the designer should equip with technical know-how in order to produce a safe and sound design. Technical know-how involves at least the basic principle on how the design approach will be. Before we proceed, let us familiarize the parts of the crane that are mentioned in this article according to the figure below.

Generally, crane mast legs can be mounted or cast on its foundations and in some cases, it is fixed to the surface of the foundations in addition to concrete blocks known as ballast that use to counter the crane weight and its forces.

Crane reactions differ and vary according to the model and the method of how the crane will be mounted to the foundation. Since cranes have reactions that differ according to the model, this article will discuss only the general approach to how the crane base is being designed. To start the design of crane foundations, the designer should gather all the necessary data needed in the design.

The model name of the crane to be used in the construction and its technical data should be identified. Each crane model and its data differ from each other, so it is best to verify the model of the crane to use at the start. The reactions to consider in the design of the crane foundation are specified in the technical data as shown in Table 2. The maximum in-service or when the crane is operational and out-of-service or when the crane is at rest are used in the analysis.

Note that the crane base reactions differ when the crane legs are embedded in the foundations or when using a ballast weight.

Table 2. The crane base reactions specified in Table 2. Figure 3. These reactions should apply in all possible locations or load cases when the crane is at rest and during the operations. The load cases in orthogonal and diagonal orientations as shown in Figure 3. The locations of the reactions should be rotated in all possible positions, though it is obvious that the critical is when the boom is positioned at 45 degrees. To distinguish the critical case, the load cases shall be checked by incorporating it via load combinations.

To reflect the maximum and worst forces caused by the crane reactions, it should be incorporated in the load combinations specified by the code. The crane load cases shall be combined with the following basic load combinations.

Only gravity loads are used in the combinations with the crane reactions. It is assumed that lateral loads wind and seismic will not occur at the same time during the crane operation. The crane foundation should be designed and assumed as a free-standing crane.

### Crane Calculator

This is to ensure that all the reactions and moments are being taken by the foundation itself. The designer can use any of the foundation types available. But the most common foundation to use is an isolated footing. A pile cap foundation is also applicable depending on the soil characteristic. In some cases, cranes legs are cast along with the raft foundations or raft on piles.We hate to break it to you, but there are NO safe rules of thumb when it comes to cribbing.

Nowhere in OSHA does it say that you will be ok if you use the rule of thumb for cribbing, instead in Blocking under outrigger floats, when required, shall meet the following requirements:.

You have to calculate it. A key thing to remember is that as a crane works and rotates over the various corners and quadrants, the load will shift and at any one time a greater load will be placed on one outrigger than on the others. It is for this reason that equally dividing the load around the outrigger pads is a mistake. Sure it sounds simple, but we all know that having adequate information to complete the calculation on-site can be challenging depending on whom you talk to.

The good news is, there is hope. It can be done. With some basic information on the crane weight, gross load weight and ground bearing pressure, then the size of outrigger cribbing for adequate support can be calculated. For example:. When it comes down to it, a rule of thumb is a principle with broad application that is not intended to be strictly accurate or reliable for every situation. While it is something that is easily learned and applied to make a preliminary determination, it is not something that Crane Tech believes should be used during crane set up.

Take the time to calculate and plan — it can make the difference between a safe lift and a sunken one. We also recommend that all users obtain soils engineering advice. Jim- Thank you for your question. Calculating pad thickness is dependent on a variety of factors such as the weight of the crane, the weight of the load to be lifted, the ground bearing capacity, the square footage required, the cribbing materials to name a few.

Crane boom length is Thank you Bobby for your question. The article gives the calculation that we use to determine the force that could be exerted upon an outrigger and to thereby, determine what should be sufficient blocking for your crane.

If you are unsure of how to do this and need further assistance, this is something that we teach as part of our Mobile Crane Operator course. Thank you for your question Doug.

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The ground bearing capacity must be determined by a soils engineer and provided to you. Hello, Can you please tell how to design the outrigger when lateral loads are coming on the outrigger? For example e. Anupam — Thank you for your comment.

We are not a manufacturer so we cannot provide insight on the specifics of this request. Hello How are you?

This result is the load that might be transferred to any outrigger as the boom moves through its work path.

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You have to have the soils PSI provided to you by a soils engineer or qualified person. In the U. I would like to know how I can calculate the outrigger opining length based on the load weight since we are working on the main road and we require to minimize the opining of outrigger as much as we can … Awaiting your reply please ….

Ameer — you need to set up your outriggers according to the manufacturers instructions and load charts for that particular crane model. There is no way to calculate this, it has to be done as stated by the manufacturer. The force, that we calculated above, is shared between four ourtiggers.