Load cells can be installed on:
- •STS cranes: Load cells on ship-to-shore (STS) cranes are generally installed at the rope ends of the crane trolleys or booms or sheave pins. They usually act as an overload protection system rather than a weighing system. With a weighing inaccuracy of about 3-5 percent of the maximum STS crane lift weight, load cells on STS need to be periodically recalibrated. All the latest models of new STS cranes have an overload protection system installed as standard.
- •RTGs: Load cells can be implemented on rubber-tyredgantry cranes (RTGs). Here, the installation is done in the shafts of the rope sheaves on the trolley or in the rope anchors. Installation on existing cranes can be tricky if no drawings of the sheaves and shafts are available. If the cranes are equipped with twin-lift spreaders, the load cells won’t be able to measure each container individually.
- •Straddle Carriers: You can also install load cells on straddle carriers hoist systems, though the degree of inaccuracy is quite large. These systems cannot weigh containers individually if the straddle carrier is fitted with a twin-lift spreader sand they cannot determine container loading eccentricities. If one container is loaded and one is empty or is light weighted, accidents will be more common.