Lift range is the determination of how far the boom is going to need to extend to pick up and lift a load taking into account distance and height.įor every lift, you want to carefully calculate this and select your max capacity based on the furthest range of extension that will be required.Ĭranes rarely lift loads straight up and down. Effect of Lift Range and Angleīefore you get into looking at what your lift load capacity is, you need to understand how you are going to be moving the load. If you need to work in a severely confined space that won’t allow the use of outriggers, that will significantly influence the stability of the crane and lower the maximum capacity. This data is crucial for understanding how the crane will sit on the site and determining any space constraints and special considerations for site prep. Each chart will show the dimensions and weight of the crane itself, along with information concerning standard operation features like outriggers.

The first thing to look at on the load chart is the specifications concerning the crane itself.

Review each section carefully to ensure you understand the machine's capabilities and limits. Ground stability, physical obstructions, and weather can affect a load.Įvery crane model will come with its own load chart.

Cranes have a maximum load, but that can only be reached under optimal conditions, which rarely occur on site. Once you have your measure of load weight, it is time to start looking at load charts and determining if your crane can operate safely under given parameters. These devices can be attached directly to the rigging to give you an accurate measure. It is worth investing in a dynamometer to allow you to measure each load before each lift. You can also physically weigh an example load using an industrial scale. Manufacturers are an excellent source for this information for individual parts that you can then add together. These weights need to be as accurate as possible. Load calculations should take into account the weight of everything being lifted, including: While it can be relatively straightforward, at times, you will need to do some math and work with formulas in order to find the number your crane rental company will need. Load calculation refers to the way in which you determine how much weight the crane will be lifting. This is especially relevant if you plan on performing a critical lift, a lift performed at 75% or more of the crane's capacity. You need to know several things about calculating a load's weight before you rent a crane. When it comes to jobs that require cranes, one of the questions your crane rental company will ask is the total weight of the load. How heavy it is, and where you need to lift it from and to. The first step in understanding crane loads and determining what machine you need on site is to accurately determine exactly what you need to lift.

50 ton crane lifting capacity