Ship Thickness Measurement and Hull Inspection in Belfast

Inspection services for ships at Belfast

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

Where ships are gauged in Belfast Harbour and Belfast Lough

In the shipyard, a ship in drydock gives full access: tanks cleaned and ventilated, shell plating reachable from the dock floor, holds staged where needed. The team works to the TM plan agreed with the class surveyor and the owner's superintendent, and the yard uses the readings to scope steel renewal. For conversions and life-extension projects, gauging before the specification is finalised avoids discovering extra steel once the yard has started cutting, which is when surprises do the most damage to the programme.

Elsewhere in the harbour, gauging is in-service. Ferries at the Stena terminals are worked around their timetables; bulk carriers at the deep-water berths allow longer hold and tank programmes; and ships at anchor in Belfast Lough can be reached by launch through the agent when the weather allows. Because the harbour sits at the head of a sea lough, the anchorage is better sheltered than an open roadstead, and a launch-borne scope is less likely to be cut short by swell. Ferry work is the most time-critical: the team boards once the ship is secured, works the areas the chief officer releases, and is clear before loading for the next sailing begins.

• Harland & Wolff drydock, Queen's Island — renewal-survey, conversion and steel-renewal gauging on ships in dock, with the class surveyor and yard planners.
• Stena Line terminals for Cairnryan and Birkenhead — ferry structure worked in instalments: one vehicle deck, one ramp or one ballast tank per port stay.
• Deep-water berths for grain and feed — bulk carrier holds gauged one by one as the grabs empty them, with topside tanks opened when the crew can release them.
• Container and general cargo terminals — in-service hull and deck gauging on short-sea and project ships during cargo work.
• Belfast Lough anchorage — launch-borne condition gauging on ships waiting for a berth or for a docking slot at the yard.
• Offshore wind terminal quays — deck and crane-foundation crack detection on installation and service vessels between load-outs.

Port state control, sulphur limits and Belfast's trading pattern

Northern Ireland is part of the UK maritime system, so port state control in Belfast is carried out by the Maritime and Coastguard Agency, which since Brexit has continued to apply the Paris MoU regime through UK legislation. Belfast Lough is outside the North Sea SOx ECA, yet the UK's at-berth limit still applies: after two hours alongside, a ship must be on 0.10% sulphur fuel. The North-East Atlantic ECA, adopted by the IMO in 2026 with its sulphur limit applying from 1 September 2028, covers much of the Atlantic seaboard that Belfast ships trade along, and owners should check its final boundary against their own routes when planning fuel and scrubber decisions.

Belfast's trading pattern is dominated by short Irish Sea crossings. Ferries on the Cairnryan and Birkenhead routes are worked hard on tight timetables, and their refit periods are short and closely planned, so accurate pre-docking gauging is what keeps a refit on schedule. Those routes are UK domestic services and sit outside the EU ETS, unlike sailings to Dublin or continental ports. The shipyard adds a second market: owners bringing vessels to Belfast specifically for docking or conversion, often from outside the region, who need the gauging done to the yard's programme rather than the ship's trading pattern.

Wherever a ship is outside a sulphur emission control area, the global 0.50% sulphur cap applies, and many of the ships calling at Belfast meet it with an exhaust gas cleaning system rather than compliant fuel. Scrubber wash-water piping, the overboard discharge and the hull penetration around it corrode quickly in service, especially on open-loop systems, and are worth adding to the gauging scope.

How a thickness measurement job runs at Belfast

A gauging job at Belfast 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.

Belfast has two airports: Belfast International at Aldergrove and George Best Belfast City, which sits beside the harbour. Dublin Airport is a further option for long-haul arrivals, though entering through Dublin brings Irish immigration rules into play alongside UK ones, so we route the team to match the visas they hold. The shipyard, ferry terminals and cargo berths have ISPS-controlled access arranged by the ship's agent or the yard, and launches for Belfast Lough are booked through the agent. Our technicians travel from India, and UK visas are secured as soon as a docking date is confirmed.

• 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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