Thickness Measurement for Timber, Wood-Pellet and Bulk Ships at the Port of Wismar

Inspection services for ships at Wismar

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

Where ships are gauged in Wismar

The cargo quays of the Seehafen are where nearly all the work takes place. A timber carrier discharging logs can release one hold at a time as it is emptied and swept, and the team works through frames, brackets and tank top while discharge continues in the other holds. Ships loading wood pellets present the opposite problem: holds are clean before loading, which is the moment to gauge them, because afterwards the cargo makes them unsafe to enter until fully discharged and ventilated. Ballast tanks are usually accessible during either operation once the crew has emptied and gas-tested them.

Wismar has no commercial drydock for visiting ships; the large covered building dock on the waterfront belongs to the naval yard and is not available for merchant repair. Ships due for docking go to repair yards in Poland, Denmark, Lithuania or elsewhere, and readings taken in Wismar can be handed to that yard and to the class surveyor beforehand. For pre-purchase and condition gauging on idle ships, lay-by berths in the port and ships at anchor in Wismar Bay are the other options, the latter reached by launch for small scopes in good weather.

• Timber berths beside the sawmill and panel plants — hold frame, bracket and tank-top gauging on log carriers as each hold is emptied.
• Bulk and pellet berths — hold gauging before wood pellets or grain are loaded, and ballast tank readings during loading.
• General cargo quays — hatch cover, coaming and lashing-point gauging with crack detection on timber and general cargo ships.
• Lay-by berths in the Seehafen — pre-purchase, on-hire and condition gauging on ships waiting for cargo or for sale.
• Wismar Bay anchorage — short scopes by launch on ships waiting for a berth, when conditions allow boarding.

Cargo hazards, port state control and Baltic trading

Ships at Wismar come under German port state control within the Paris MoU, and older bulk carriers and general cargo ships are frequent subjects of those inspections. The IMSBC Code governs the bulk cargoes moving through the port, and its schedule for wood pellets warns of carbon monoxide generation and oxygen depletion in cargo holds and in spaces connected to them. For a gauging team that means atmosphere testing and ventilation before entry are part of the plan, not an afterthought, and the ship's enclosed-space procedures are followed for every hold and tank.

Bulk carriers in the Wismar trade fall under the Enhanced Survey Programme, and their renewal surveys carry the extended gauging and close-up survey that ESP demands of ageing hold and tank structure. Smaller general cargo ships are outside ESP but still subject to the usual class cycle and, since 2025, to EU MRV emissions reporting from 400 GT upward. Ships of all flags calling at the port need an Inventory of Hazardous Materials under EU rules, and those trading to the northern Baltic in winter must meet the ice-class requirements of Finnish and Swedish ports.

Ships trading to Wismar 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 Wismar

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

Hamburg Airport is the usual gateway, with rail and road connections east to Wismar; Rostock-Laage is closer but has few international services. The team holds Schengen visas for Germany, and the agent arranges port access, the berth window and, where pellets or other hazardous cargoes are involved, confirmation that the holds will be ventilated and tested before entry. We fix flights once the loading or discharge slot is confirmed, because timber and bulk berths at Wismar can shift with cargo readiness.

• 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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