Ultrasonic Thickness Gauging for Ships at the Port of Aarhus

Inspection services for ships at Aarhus

Each service has its own page with the method, the class requirements and what the report contains.

Where gauging happens in and around Aarhus

Inside the port, the container terminal, the bulk and general cargo quays and the oil harbour are all ISPS facilities with their own access rules, and gauging is arranged through the ship's agent and the terminal. Bulk quays tend to give the most room for work alongside: holds can be measured between discharge and loading, and ballast tanks emptied during discharge can be entered once the ship has certified them safe. On the container terminal, crane schedules decide when deck areas are clear, so the team works to the terminal planner's sequence and stops when cranes move over the area.

For docking, ships calling at Aarhus generally go to yards elsewhere. Fayard at Munkebo on Funen is the nearest large Danish repair yard, and Ørskov Yard in Frederikshavn serves northern Jutland; many short-sea operators also dock in Poland or the Baltic states. When the renewal survey is booked at one of those yards, an Aarhus call beforehand is a useful chance to carry out pre-docking gauging and settle the steel renewal estimate before the yard stay begins, rather than discovering the scope once the ship is in dock.

• Container terminal (APM Terminals Aarhus) — ballast tank and deck gauging on feeder container ships, timed around crane work and agreed with the terminal.
• Bulk and general cargo quays — hold frames, hopper plating and tank-top measurement on grain and feed carriers between discharge and loading.
• Oil harbour — deck, void-space and ballast tank gauging on product tankers during discharge, with cargo tanks left closed.
• Ferry and ro-ro berths — machinery-space piping and vehicle-deck measurements on Kattegat ferries and ro-ro ships outside their timetabled sailings.
• Fayard, Munkebo — renewal and docking-survey gauging for Aarhus-trading ships routed to Funen for repair.
• Ørskov Yard, Frederikshavn — docking gauging and repair-scope measurement on short-sea ships and ferries in northern Jutland.

Regulation and market context for Aarhus

Denmark is a Paris MoU member, and Aarhus sees a steady flow of older short-sea and feeder tonnage, which the Paris MoU risk profile weights towards more frequent inspection as ships age. Corrosion found during port state control — wasted air pipes, holed ventilators, thinning in deck plating around hatch coamings — often produces a requirement to measure and repair before departure or at the next port. Gauging and reporting the affected structure during the Aarhus stay helps the ship and its class settle the repair scope with the surveyor without losing a further call.

The Kattegat lies within the Baltic Sea SOx ECA, so ships calling at Aarhus burn 0.10% sulphur fuel or use exhaust gas cleaning systems. As an EU member, Denmark applies the EU ETS to shipping from 2024 and FuelEU Maritime from 2025, and short-sea operators are weighing whether to keep, retrofit or replace older tonnage. Each of those decisions benefits from current thickness data: a retrofit docking needs a steel renewal estimate, a sale needs a credible condition record, and an extended trading life needs a clear view of where corrosion is heading. Winter ice is not normally a factor in Aarhus Bay, but feeders and bulk carriers that continue into the Gulf of Bothnia often carry Finnish-Swedish ice class, and their ice belts warrant separate attention.

Ships trading to Aarhus are inside a sulphur emission control area, where fuel must not exceed 0.10% sulphur unless an exhaust gas cleaning system (scrubber) is fitted. Scrubber wash-water piping, the overboard discharge and the hull penetration around it are among the fastest-corroding parts of a modern ship, so they belong in the gauging scope at every docking and, on open-loop systems, between dockings.

How a thickness measurement job runs at Aarhus

A gauging job at Aarhus runs the same way whatever the ship type. The sequence below is what the superintendent, the attending surveyor and the yard can expect from us.

Billund Airport is the main international gateway for central and southern Jutland, with Aarhus Airport and Copenhagen Airport as alternatives and frequent rail services from Copenhagen to Aarhus. The container terminal, bulk quays and oil harbour are controlled under the ISPS Code, and the ship's agent arranges gate passes for named technicians. Feeder schedules can change at short notice, so we stay in close contact with the agent on berthing times. Denmark is a Schengen state and the team travels from India on Schengen visas; visa lead times mean planned work should be booked as early as possible.

• Send the vessel name or IMO number, ship type, class society, the survey due (annual, intermediate, renewal survey number, CAP or owner's condition survey), the port and dates, and the scope you expect.
• We confirm the scope against the class rules for that survey, prepare the thickness measurement plan with frame and section references, and say whether the measurement will be credited to a class survey.
• Mobilisation is planned around visa lead times and the vessel's schedule; the ship's agent arranges port access, and the yard or ship arranges staging, lighting, ventilation and gas-free certificates.
• Gauging with calibrated ultrasonic thickness gauges: through sound coatings only where the gauge's through-coating mode has been verified on a coated reference, otherwise on cleaned bare steel, with every reading tied to its frame, strake and location on the sketch.
• Readings are compared with original thicknesses as work proceeds; substantial and excessive corrosion and any cracks are reported to the attending surveyor and the superintendent the same day.
• The final report is issued on the class thickness-measurement formats with sketches, a summary of locations exceeding the allowable margins, piping tables where piping was in scope, and the gauge calibration and technician certificates.

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