Can the Franna AT-20 Lift 20 Tonnes When the Boom is Fully Extended?
The Franna AT-20 is renowned for its versatility and impressive lifting capabilities. With a maximum lifting capacity of 20 tonnes, this hydraulic all-terrain pick and carry crane is a staple in various construction and industrial settings. However, one common question among operators and project managers is whether the Franna AT-20 can lift the full 20 tonnes when the boom is fully extended?
Understanding the Rated Capacity
The rated capacity of a crane like the Franna AT-20 is determined by several factors, including the boom length, load radius, and the angle at which the boom is positioned. These factors are critical because they directly affect the crane’s stability and lifting power.
The Role of Boom Length and Load Radius
When the boom of the Franna AT-20 is fully extended, the load radius increases significantly. The load radius is the horizontal distance from the center of the front wheels to the center of the winch rope or tackle with the load applied. As the load radius increases, the crane’s lifting capacity decreases due to the greater leverage effect on the boom and the crane’s overall stability.
Examining the Load Charts
To determine if the AT-20 can lift 20 tonnes with the boom fully extended, we need to refer to the crane’s load charts. These charts provide detailed information on the lifting capacities at various boom lengths and load radii.
For instance, if we look at the load chart for the AT-20, we will see different lifting capacities based on the boom’s extension and the load radius. Here’s an example from the manual:
- At a boom length of 13.85 meters and a load radius of 7.0 meters, the rated capacity is significantly lower than 20 tonnes.
- The maximum lifting capacity of 20 tonnes is achievable only at a much shorter boom length and a smaller load radius.
Safety and Operational Guidelines
It’s crucial to adhere to the safety and operational guidelines provided in the Franna AT-20’s rated capacity manual. Attempting to lift 20 tonnes with the boom fully extended can compromise the crane’s stability and potentially lead to accidents or equipment damage.
Operators should always:
- Consult the load charts specific to the lifting configuration they are using.
- Ensure the crane is set up on a firm, level surface.
- Avoid exceeding the rated capacity for the given boom length and load radius.
While the Franna AT-20 boasts a maximum lifting capacity of 20 tonnes, it cannot lift this amount when the boom is fully extended. The lifting capacity decreases as the boom extends and the load radius increases. For safe and efficient operations, it is essential to refer to the crane’s load charts and adhere to the recommended lifting capacities for various configurations. Understanding and respecting these limitations will ensure the safe use of the AT-20 crane and prevent any operational hazards.
