Every jacking system has its limitations in terms of weight. Those limitations are not the same for every operation mode. Usually you will find three types of limitations in the operation manual of the barge:
- Maximum JACKING rating: It refers to the maximum load that the jacking system can handle. This rating determines the rig’s ability to elevate itself.
- Maximum HOLDING rating: It refers to the maximum load that the legs (pinions) can support while hull is elevated. This rating is important for ensuring the stability of the rig during elevated operations.
- Maximum STORM rating: This rating refers to the maximum environmental conditions, such as wind, waves, and current, that a rig can withstand while maintaining its stability and structural integrity. It is crucial for ensuring the safety of the rig during harsh weather conditions. It is determined based on the rig’s design capacity and ability to withstand dynamic loads.
As you can see, the HOLDING rating is higher than JACKING rating, which means the pinions can hold more weight when they are stationary (in elevated condition), then when they are turning (elevating the hull).
If you want to learn more about the operation of the jacking system, watch the videos below.