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Lifting of the subsea cable basket by crane vessel

TABRİZ_013

Marine/Ocean
Joined
Aug 4, 2025
Messages
1
The submarine cable basket is made of steel construction. It is a spatial structure and not a carousel-type basket. The overall dimensions of the cable basket are 12.3 x 12.3 x 6.1 meters. The submarine cable is wound diametrically inside this steel structure. The total length of the cable is 22 km. The net weight of the load is 635,874 kg, and the gross weight is 720,874 kg.
This load will be offloaded onshore from the hold of a general cargo vessel using the vessel crane with a hook block capacity of 2,500 tons (2 x 1,250 tons). The basket has eight (8) lifting pads (or lifting lugs) along the diameter (D = 4.770 m), each rated at 150 tons. The vessel crane lifting arrangement using a single 1,250-ton hook (double wire rope sling or grommet) has been considered in the project. It is planned to attach two double slings to each hook horn.
Our question is that, as a second option, it is necessary to design a spreader beam.
Please recommend a typical metal structure for the spreader beam design.
The spreader beam must be suitable for the load structure.


Thank you.
 

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That's an expensive load you'll be lifting. Sure you can afford to hire an engineer for this lift. Are you going to insure it? Nothing about this sounds normal.
 
It's a lifting frame you will need, not a "spreader beam".

You need to pick up from those 8 lifting points, vertically upto a frame and then build AND TEST this with your two lifting points rated at over 400 tons each.

That is a major structural component which requires professional design.
 
This heavier basket was lifted with slings only.


So there. The internet says it's fine.

It's that what you're going to tell your boss, customer and insurer?
 
Solution
But also look at all the work they do to show that the design was satisfactory.

Those "slings" are pretty near vertical and grouped in sets of two. This design is 8 spaced out eye connections.

This is not a simple or straightforward design activity and lifting scenarios are often FOS Of 4.
 

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