Marine crane
A crane installed on a vessel, offshore platform, or quayside, designed for the corrosion, motion, and dynamic-load conditions of working over water.
A marine crane is any lifting device built for installation on a vessel (deck crane, cargo crane), an offshore platform (rig crane, pedestal crane), or a fixed quayside structure (harbour crane). The shared design challenge is the marine environment: salt-air corrosion, vessel motion adding dynamic loads to the rated lift, and operation in weather conditions that would stop work on land.
Deck cranes on cargo vessels handle the ship's own cargo at ports without shore-crane infrastructure. Offshore pedestal cranes service oil and gas platforms, lifting supplies and personnel baskets from supply vessels in moving sea states. Subsea cranes (active heave compensation, AHC) keep the load steady relative to the seabed even as the vessel rolls and pitches. Quayside cranes — ship-to-shore (STS) container gantries, mobile harbour cranes — handle freight at terminals.
Manufacturers include MacGregor (vessel cranes), Liebherr Maritime (offshore + harbour), Cargotec, Palfinger Marine, and Huisman (heavy-lift cranes for crane vessels). Because marine cranes are usually engineered into the vessel or platform, used-equipment trade is concentrated on retrofits, replacement of damaged units, and second-life sales of vessel-mounted cranes when the host vessel is scrapped.
For a naval architecture audience: pay close attention to the certifying authority (DNV, ABS, Lloyd's, BV, ClassNK, RINA), the dynamic-load category (whether the rated load already includes a dynamic amplification factor), and whether the crane has AHC and constant-tension capability if the application is offshore handling.