Ship Thickness Measurement for Oslo Shipowners, Managers and Buyers

Inspection services for ships at Oslo

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

Where gauging for Oslo-controlled ships happens

Within Oslo, practical gauging locations are the ferry and cruise berths, the Sjursøya container and fuel terminals, and anchorages in the Oslofjord where ships occasionally wait. Ships needing a docking survey in Norway usually go to yards on the west coast, and many Norwegian owners dock in Poland, Lithuania, Turkey or Asia depending on where the ship trades. For the ferries that serve Oslo, the annual docking is the main opportunity for tank and shell measurement, with in-port work limited to what the timetable allows.

For sale-and-purchase work, the location is set by the ship's trading pattern: buyers' inspections often take place at a discharge port or anchorage wherever the ship happens to be, with only a short window agreed with the seller. For fleet programmes, we work wherever the docking is scheduled and report back to Oslo in a single format. Results from each yard are issued in the same layout, with frame and strake references matching the ship's TM plan, so the Oslo technical department can compare them without re-keying. The list below shows the kinds of location involved and the work typically done at each.

• Oslo ferry berths — piping, car-deck and ramp-area measurements on the Kiel, Copenhagen and Frederikshavn ro-pax ships during midday turnarounds.
• Cruise berths near the city centre — machinery-space piping and open-deck plating on cruise ships, planned with the chief engineer.
• Sjursøya container and fuel terminals — ballast tank and deck gauging on feeders and product tankers alongside, with cargo tanks kept closed.
• Oslofjord anchorages — pre-purchase or on-hire gauging of accessible spaces on ships waiting for berth or orders, with launch access through the agent.
• West-coast Norwegian yards — docking-survey and renewal gauging for Oslo-managed ships repaired in Norway.
• Overseas docking yards — renewal-survey and CAP gauging for Oslo fleets in Chinese, Turkish, Polish or Middle East yards.

Norwegian flag, North Sea ECA and the Oslo market

Norway is a member of the Paris MoU and, as an EEA state, applies much of the EU's maritime legislation through the EEA Agreement. Many Oslo-controlled ships fly the flag of the Norwegian International Ship Register (NIS); others are registered in the Marshall Islands, Liberia, Malta or Singapore. In every case the gauging scope for a class survey is set by the classification society's rules and the relevant IACS unified requirements. Port state control officers across the Paris MoU region record structural deficiencies that often lead to a request for urgent measurements, and the Oslo technical department then needs a team at the next suitable port.

The Oslofjord lies within the North Sea SOx ECA, so ships trading here burn 0.10% sulphur fuel or run scrubbers. Oslo-controlled tanker and bulk fleets include many scrubber-fitted ships, and the overboard discharge lines and their shell connections are a recurring source of leaks if not measured at each docking. Norwegian owners have also been early movers into LNG, battery and ammonia-ready designs, and retrofits on existing ships bring new penetrations and foundations that need a structural baseline. For older tonnage, the strength of the sale-and-purchase market in Oslo means condition gauging is often the deciding evidence on whether a ship is sold for further trading or for recycling.

Ships trading to Oslo 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 Oslo

Most of the work on a Oslo job happens before the team boards: scope, plan and access are settled first, so the time on board goes on measurement.

Oslo Airport at Gardermoen is the international gateway, with a rail link into the city. Jobs in the port itself need ISPS gate passes for the ferry, cruise and Sjursøya terminals, arranged through the ship's agent; anchorage work in the Oslofjord requires a launch booked by the agent. Most Oslo-commissioned jobs, though, take the team straight to an overseas yard. Norway is a Schengen country, so work there is covered by a Schengen visa; for yards outside Europe, the team applies for the visa of the docking country, which is why we ask for the yard and dates 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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