IMR Vessel (Inspection, Maintenance, Repair)

An IMR vessel performs inspection, maintenance, and repair of installed subsea assets: pipelines, manifolds, christmas trees, risers, and cables. Typically a DP2 monohull with a work-class remotely operated vehicle (or two), an active-heave-compensated crane, a moonpool, and survey spreads, it surveys condition, replaces components, and intervenes on wells (light well intervention) without a dedicated construction or drilling rig. IMR work supports field life extension across the asset’s operating phase. The vessel class overlaps with the offshore construction vessel but is optimized for recurring tieback and integrity campaigns rather than first installation.