Ship Thickness Measurement at Muuga Harbour, Estonia

Inspection services for ships at Muuga

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

Where gauging takes place around Muuga

Muuga has no shipyard of its own; the repair yards that serve the area are at Kopli in Tallinn and at Paldiski on the west coast, and the repair yard at Naantali in Finland is under the same group as the Tallinn yard. Gauging at Muuga is therefore alongside work, at the terminals, and its value is largely in preparation: a ship measured here arrives at the dock with a steel list already drawn up. Owners also use Muuga calls to repeat gauging at intervals and watch how wastage develops between surveys.

At the liquid terminals the ship's tanks are normally cargo-loaded or just discharged, so the realistic scope is deck plating, cargo and ballast piping, and ballast tanks that the ship's crew have cleaned and gas-freed. At dry bulk berths holds are accessible once the cargo is out, which is the right moment for frames, hopper plating and tank tops. Container feeders offer hatch covers, coamings and deck structure while boxes are moving. Entry to each berth is arranged through the ship's agent, with port security and the terminal's own safety rules to follow.

• Oil-product and liquid bulk terminals — deck plating, cargo and ballast piping and gas-free ballast tanks on tankers during or after discharge.
• Dry bulk and fertiliser berths — hold frames, hopper plating, tank tops and hatch coamings on bulk carriers before loading.
• Container terminal — hatch cover panels, coamings and deck structure on feeders during short calls.
• General cargo and steel berths — tween decks and lower holds on multipurpose ships, plus crane pedestals.
• Muuga Bay anchorage — narrow launch-borne scopes for ships waiting offshore.
• Kopli, Paldiski and Naantali yards — where Muuga ships usually dock, using readings from here for steel planning.

Estonian port state control and the vetting culture of oil cargo

Port state control in Estonia falls under the Paris MoU and is carried out by the national Transport Administration, which took over maritime functions from the former Maritime Administration. Tankers are a high-priority ship type in the regime, and a ship with poor records can expect a detailed inspection of the deck, cargo piping and fire-fighting systems. Estonia also takes part in the mandatory ship reporting and traffic monitoring system that covers the Gulf of Finland, where a large share of the oil and bulk movements are concentrated.

Oil cargo brings another layer of scrutiny. Oil majors and traders vet tankers before they fix them, using inspectors who look at structural condition and maintenance records, and a charterer can reject a ship with doubtful hull or piping condition. Thickness readings from a recent survey help a technical manager counter that. Foreign-flag ships entering EU ports are required to carry an Inventory of Hazardous Materials, and voyages touching EU ports are now covered by the EU emissions trading scheme and FuelEU Maritime, which is another reason owners want a clear picture of ship condition.

Ships trading to Muuga 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 Muuga

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

Tallinn Airport is the normal arrival point, with direct and connecting flights to the main European hubs, and the harbour is a short road journey from the city. Estonia is part of the Schengen area, so Schengen visas are needed for technicians travelling from India and should be applied for as soon as a ship's call is likely. Gate passes and terminal permits are requested by the ship's agent; the team brings its own gauges and couplant and confirms the safety rules with the terminal on arrival.

• 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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