Project Background

The customer needed a marine crane to be installed on the deck of an existing vessel, mainly for ROV launch and recovery operations. The crane would also be used for routine material handling and auxiliary maintenance work on board.

At the beginning of the project, the customer considered using a fixed boom crane. However, the available deck space was limited, and a fixed boom design would take up more space during both operation and parking. This made it less suitable for the vessel’s deck layout.

The lifting work was not limited to one type of cargo. The crane needed to handle ROV-related equipment, marine supplies, tools, and onboard components of different sizes and weights. Therefore, the customer needed a crane with flexible operation, suitable working radius, and reliable performance within a limited deck area.

Based on these requirements, MOTCRANE recommended a 4-ton hydraulic folding boom marine crane. The folding boom structure allows the crane to work more flexibly around the deck and retract after operation, while the hydraulic system provides smooth movement for lifting, boom luffing, folding, and slewing.

For this project, the customer was not only concerned about rated lifting capacity. Since the crane was required to lift 4 tons at a 7.7 m working radius, the actual load capacity at different radii, deck foundation strength, slewing range, and installation space all had to be checked carefully.

During the solution confirmation stage, MOTCRANE focused on the actual working radius, lifting height, load capacity at different boom positions, slewing range, foundation dimensions, deck load-bearing conditions, and classification society certification requirements if needed.

MOTCRANE Solution

Based on the deck conditions and lifting requirements provided by the customer, MOTCRANE explained the differences between straight boom and folding boom marine cranes. After comparing the two options, the customer decided to proceed with a 4-ton hydraulic folding boom marine crane.

The crane is equipped with a hydraulic drive system, folding boom structure, and telescopic extension, making it suitable for ship decks, dockside platforms, and offshore lifting applications.

The folding boom design gives the crane more flexibility in a limited working area. The boom can be extended, folded, and adjusted according to the lifting position, allowing the crane to handle ROV launch and recovery, equipment handling, and material lifting from different directions on deck. Compared with a straight boom crane, this structure is also easier to stow after operation and helps reduce interference with deck access and nearby equipment.

Before confirming the final solution, MOTCRANE checked the key project parameters with the customer, including:

• Required maximum lifting capacity
• Maximum working radius
• Lifting height
• Crane installation position
• Deck foundation dimensions and load-bearing conditions
• Slewing angle
• Hydraulic power configuration
• Corrosion protection and surface treatment requirements
• Classification society certificate or third-party inspection requirements

Based on these details, MOTCRANE matched the crane structure, hydraulic system, slewing mechanism, control system, and installation requirements to the customer’s vessel conditions. This helped ensure that the crane could meet the 4-ton lifting requirement at the required working radius while remaining suitable for actual ship deck operation.

If you need a marine crane for ROV launch and recovery, ship deck lifting, or offshore equipment handling, you can request a marine crane solution from MOTCRANE.

The crane was designed for ROV launch and recovery operations, with a lifting requirement of 4 tons at a 7.7 m working radius. This required careful matching of the crane structure, hydraulic system, slewing mechanism, and ship deck foundation.