The human body may not be the first object that you would compare to a mechanical crane, but it manifests remarkably similar functions. When an individual lifts a heavy object, it’s vital to maintain an uncompromising form to avert any injuries. For example, the upper body cannot provide the entire support system to transport an object; the lower extremities play a crucial role in using proper form to complete any type of physical effort. Strong and contracted abdominal muscles as well as stable quadriceps are just as important as the upper body. Likewise, a crane holds a significant spot in the realm of construction and transportation of materials. Without the use of a crane, builders would be unable to accomplish a multitude of tasks. A crane cannot simply exist; rather, like the body, it must be reliably supportive. One specific form of crane is dubbed the “Double Girder Overhead Crane”.
Akin to the lower extremities of the human framework, the double girder crane boasts parallel support girders, or beams, that can be described as overhead or under running, depending on their location in relation to the rest of the crane parts. Overhead girders maximize available space from the ground to the ceiling and allow for a higher hook height. Contrary to a crane with double beams is the single girder crane. Just as you would imagine, it’s less expensive, but is unable to transport heavier loads and materials. For this reason, double girder cranes are recommended for any weightier capacities or loads that have to travel a longer span of distance.
The double beam is utilized in outdoor and indoor environments for the purpose of material transportation, production line, installation and maintenance engineering, steel mills, mining areas, and shipping ports. When preparing for installation of a double girder bridge crane, it’s essential to consider the support structure of the building in which it will be fixed. Because double girder cranes have more components, additional tie-backs or support columns may be necessary to handle the extra weight. Another variable to give thought to is whether or not the crane will be located in an environment with flammable or explosive gas. If so, the design and manufacturing process needs to be adapted to provide explosion-proof protections.
As with any purchase of large equipment, it will demand a significant amount of money and prior research and consideration of variables. The user can only hope that the crane will be reliable and function efficiently. Some common issues that you may encounter could include damage to the wire rope or overhead crane skew, alignment glitches, extreme wear on the wheels, harm to the hooks, or any electrical problems. Before purchasing, make sure to consider the following:
- The legitimate needs for the work that will be done.
- The working environment of the crane should be considered as a crane will necessitate specific adaptations if the environment contains explosive or flammable gas.
- Regular inspection of the crane will need to be performed.
In addition to special considerations, the class of double girder crane and hoists is a factor to include in the plan. There are six classes of double girder cranes depending on the amount of work that will demanded of them.
Class A (Infrequent or standby): Typically found in turbine rooms, motor rooms, transformer stations, and public utilities, they handle materials best at slow speeds.
Class B (Light service): These are found in service buildings, light warehousing, repair shops, light assembly operations and can serve up to two to five lifts per hour. They also serve low speed demands.
Class C (Moderate service): Normally found in paper-mill machine rooms and machine shops, they transport loads that are 50% of rated capacity and fulfill five to ten lifts per hour.
Class D (Heavy service): Found in heavy machine shops, foundries, fabricating plants, container yards, lumber mills, and steel warehouses, they operate where heavy-duty work is demanded. They average 10-20 lifts per hour over a distance of 15 feet.
Class E (Severe service): Cranes of this class move loads that are close to a rated capacity. They are located in magnet, bucket, and magnet/bucket combination cranes in scrap yards, lumber mills, and fertilizer plants and complete over 20 lifts per hour.
Class F (Continuous severe service): These cranes are required to complete continuous heavy loads under demanding service conditions. Efficiency is key with this class as they affect the total production of the facility. Undoubtedly, they need to provide supreme reliability and special attention should be paid to daily maintenance.
Double girder cranes can be of noteworthy importance in various types of facilities. Not only do they partake in a facility’s production efficiency, but also the safety and overall well-being of the designated location. Be sure to do proper and appropriate research before investing in one of these construction beasts.