tankertooffshoresupportvessel

Tankertooffshoresupportvessel, or tanker-to-offshore-support-vessel, describes the conversion of an existing tanker hull into an offshore support vessel (OSV) such as a platform supply vessel (PSV), anchor-handling tug supply vessel (AHTSV), or other specialist support ship for offshore oil and gas operations. The approach leverages the strong hulls and large deck areas of many tankers to provide cargo capacity, crew transport, and equipment handling near offshore installations.

Suitability and scope vary, but typical candidates are mid-sized tankers with adequate deck space and load-bearing capability. Retired crude or product tankers can be acquired at lower upfront cost, though the conversion involves substantial engineering work, system upgrades, and regulatory re-certification to meet OSV requirements.

The conversion process generally includes feasibility assessment, hull inspection, and obtaining classification society approvals. Modifications commonly encompass deck equipment installation (cranes, winches, pipe racks), the addition of a helideck or improved crew facilities, and upgrades to power, propulsion, and dynamic positioning (DP) systems. Safety and environmental systems are upgraded, including firefighting, life-saving, ballast, and wastewater handling, to comply with SOLAS and MARPOL standards. The vessel is also reclassified, reflagged if needed, and brought into compliance through ongoing surveys and crew training.

Operationally, tanker-to-offshore-support-vessels serve offshore rigs by transporting fuel, water, drilling fluids, equipment, and personnel. They may perform cargo, supply, and rig-move duties, and some are configured for additional roles such as diving or remotely operated vehicle (ROV) support, depending on the outfitting.

Economic viability depends on conversion cost, regulatory compliance, and charter demand for OSVs in the offshore market.