However, there are a lot of cranes installed before Octostill on platforms.The thing to watch, with this type of chart is that the chart in the crane matches the boom on the crane. All cranes on platforms or platform drilling rigs placed after October 1, 1976, require the lifting capacity chart with the one length of boom shown. Charts of this type are required by API 2C, and have been adopted by USGS and by the United States Coast Guard. This chart eliminates the possibility of misreading the boom length and coming up with the wrong capacity for the crane. The other type of lift chart is one that has only the boom length that is on the particular crane.
It is then your responsibility, the crane operator, to know the length of the boom on the crane that you are operating, so that you can tell from the chart how much the crane is capable of lifting.
That is, the boom lengths may be 35, 40, 50, 60, or 70 feet on up to the longest boom that can be used on the crane.
There are two types of lifting capacity charts that have been used on offshore cranes.One type will have every length of boom on that chart that can be used on the crane.
