PSV Conversion to Cable Laying Vessel

GLO Marine successfully delivered the retrofit of a Platform Supply Vessel into a specialized cable laying and maintenance vessel.

Originally operating as a PSV, the vessel underwent a full conversion to enable subsea cable installation, maintenance, and testing activities. The scope included new accommodation for 28 crew members, integration of a complete cable lay spread, and the creation of dedicated cable storage spaces to support operational readiness.

To ensure regulatory alignment, the vessel’s documentation and key drawings were updated to reflect the as-built condition and comply with applicable DNV rules.

The key challenge was integrating multiple high-load cable handling systems and associated subsea tools into the existing PSV layout—while maintaining compliance across structure, safety, escape, and onboard systems.

The conversion required the installation and integration of:

• 50-ton A-frame
• 20-ton Cable Drum Engine (CDE)
• 18-ton Linear Cable Engine (LCE)
• MD3 cable plough system
• Remotely Operated Vehicle (ROV)
• Fiber optic cable testing equipment
• Sheaves for towing and testing operations

To create the required space and support paths for equipment and operations, two new decks were installed above the main deck, new compartments were added, and cable storage spaces were created both below the main deck (after demolition works) and on the main deck.

This required careful coordination across structural design, fire integrity, escape arrangements, and mechanical systems (including ventilation and tank venting), ensuring the converted vessel met class expectations without compromising operational capability.