Deciding to purchase a crane for your facility or worksite is a big decision. Besides determining what type of crane to purchase, you also need to determine what size to purchase. But, there are about as many sizes for overhead bridge products as there are cranes in general. How do you determine which size is best or, more accurately, how much tonnage the crane will lift?
This is a tricky question with a complicated answer in some ways. You might assume that if you need to lift 35,000 pounds you need a crane that will lift that much in tons. So, you set about shopping for a product that will lift this much weight. To determine this, you need to do some math.
An overhead crane lifts tonnage and that is calculated from the center of the crane to the center of the load. This distance is measured as the radius. Your crane must lift the amount of weight you need it to from approximately five feet from the center.
There are charts that will detail what size crane to purchase based(compra polipasto basada) upon how many feet up you need your intended load weights to go. But, this is a little easier to determine when you are dealing with bridge cranes.
Bridge cranes come as single-girders and double-girders. You can expect that the single-girder will lift 10 or 15 tons. Anything over this amount is suited to a double-girder bridge crane(adecuado de capacidad de grua). However, this can vary based on the manufacturer you purchase the bridge crane from.
Some will make double-girder bridges that lift 80 tons. Your job is to figure out the average or highest amount of weight the crane must lift for your production lines or for your project. This allows you to get more use out of the crane if it can lift more products and batches of items for you and transport them overhead to their next stop.
If you manufacture or produce items indoors in a stationary location, and you know that no load will go over 10 tons(puente 10t), a single-girder unit should suffice. This is the best option as long as you have no need for the machine to go past 65 feet in width. Otherwise, you would need to select the double-girder overhead crane.
The single cranes are the most economical and are the least expensive to install. If you can get along with selecting one of these, you will get maximum production for a minimum of expense. Double-girders are best for anything over 10 or 15 tons and are more costly to install but they will get the job done.
Both of these overhead cranes can be outfitted with different features and can be designed and built to meet custom configurations. Choosing a bridge crane is not always that easy but there are many manufacturers that offer custom options. If you cannot find the crane to handle your tonnage, you could have one built for you. Search online for manufacturers and inquire if you cannot find a ready-built crane right for your needs.
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