Ship Maintenance
A gangway is a moving structure: it telescopes, slews, and follows the tide and the vessel's draught, so its own weight feeds directly into the loads on its drive machinery and into how the whole assembly is balanced. Handrails are not primary structure, but run the full length of the walkway and add up, which makes the choice of material more than a question of corrosion alone. Aluminium weighs about a third of what steel does, and in a salt-laden environment it does not rust inward from a break in the coating the way steel does — which is why it is the usual choice for structures of this kind.
The scope covers cutting out corroded steelwork, assembling and welding aluminium stanchions and rails in place, and making the connections to the existing structure. Aluminium conducts heat quickly and loses strength through the heat-affected zone, so the welding sequence and the placement of joints are planned together to keep distortion in check. The work is mostly at height and over water: welding is screened off, and full-body harnesses are worn throughout.
