Solving the challenges of VCM installation on Pipe-Laying Support Vessels
The challenge of manual offshore operations
Installing heavy subsea equipment is always a challenge — especially when done manually in the unpredictable offshore environment.
One such operation is the installation of Vertical Connection Modules (VCMs). These steel components can weigh several tonnes and must be lifted, tilted, rotated, aligned, and bolted into place — often in confined spaces where cranes cannot reach. Traditionally, this has been done manually by crew members.
The result? An operation that’s time-consuming, labour-intensive, and poses serious safety risks — especially on a moving vessel.
What is a vertical connection module (VCM)?
A VCM is a specialised connector with a high level of complexity, used in subsea oil and gas operations. It enables the secure attachment of flexible pipelines to seabed structures such as manifolds or riser bases.
One of its defining features is the gooseneck — a curved extension that allows the equipment to be connected upright whilst the line weight lies on the seabed.
The issue
The VCMs are like drip-free hydraulic quick coupler from hydraulics systems. And in the same manner, the VCM must be installed to the pipe before deployment, meaning it needs to be carefully aligned with the firing line — even if that means positioning it upside down.
VCM installation typically takes place on Pipe-Laying Support Vessels (PLSVs). These vessels feature a central opening to the sea called a moon pool, through which the flexible pipe is deployed. Above the moon pool sits a large vertical tower fitted with tensioners that bear the load of the pipeline during laying.
However, space is extremely limited, and cranes cannot be used to assist due to the surrounding structures. Up to now, the tilting operation has relied entirely on manual effort — using tug winches and monorails to manoeuvre the VCM to the firing line, the actual axis of the pipeline being laid just below the tower, where it must be carefully positioned and connected.
This challenging work takes place in confined spaces on a moving vessel, making it a significant challenge in rough seas — all must be done manually.
A new approach: the VCM handling system
Royal IHC has developed an innovative, patented VCM handling system that addresses these operational constraints head-on.
This state-of-the-art system allows the VCM to be safely and precisely positioned on the firing line — whether facing up or down — with full access for seal inspection inside the connector body. Designed for use on PLSVs, it transforms what was once a high-risk manual process into a controlled, mechanised operation.
Key capabilities:
- Full adjustment across all three translational axes
- Tilting and flange-plane alignment for accurate positioning
- Modular and scalable to suit vessel layout, project scope, and budget
How it works
The system is positioned in an open area on the deck, allowing the VCM to be mounted upright with a simple lifting operation — no complex manoeuvres required.
Once secured, a self-skidding mechanism, tailored to the vessel’s layout, moves the unit into position on the work table, directly over the moon pool at the firing line. After tilting to the required angle, final positioning is completed and the sealing elements can be inspected safely by a crew member.
Once aligned, the flanges on the gooseneck and pipeline are bolted. The system then retracts, the work table opens, and deployment proceeds.
Designed for safety and redundancy
The VCM handling system is symmetrically loaded and equipped with redundant drive units, providing critical safety and reliability:
- Ensures structural and geometric stability during operation.
- Maintains functionality even in the event of a single drive unit failure.
Additionally, the system allows the VCM to remain fastened during transit, saving both space and setup time on deck.
Driving innovation in offshore operations
By eliminating the risks and limitations of manual VCM installation, Royal IHC’s handling system sets a new benchmark for safety, efficiency, and precision in offshore pipe-laying operations.
Written by
Leonardo Pinhel Soares
Offshore Engineer
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