Thickness Measurement for Ships Working Cargo at Tilbury

Inspection services for ships at Tilbury

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

Where a ship can be gauged at Tilbury

Gauging is done alongside, whether the ship is on the river wall or in the dock. The agent arranges the pass for the team and confirms the berth and the discharge programme. For car carriers, we aim for the period when decks are empty and ramps parked, so deck plating, ramp hinges and the hoistable-deck suspension points can be read without vehicles in the way. For grain and bulk ships, holds are gauged once empty and swept, in the order cargo is discharged.

The estuary anchorages are used by ships waiting for the tide or for a berth, and short launch-borne jobs are possible there when the weather and the pilot station allow. There is no large repair drydock at Tilbury itself, so ships needing a full renewal survey go elsewhere in the UK or on the Continent. What we measure here forms the base for the steel estimate that owners send to the yard, which makes a Tilbury stay a good point to gather evidence rather than to carry out repairs.

• River berths and landing stage: cruise ships and cargo ships gauged on turnaround or while discharging against the river wall.
• Enclosed dock berths: hold, tank and deck gauging on grain, paper and steel carriers after they lock in.
• Grain terminal berths: hold frames, brackets, hopper plating and tank tops as each hold is emptied.
• Ro-ro and car carrier berths: stern ramp, ramp hinge and hoistable-deck gauging between vehicle discharge and loading.
• Estuary anchorages: short deck, hatch cover and air-pipe scopes on ships held for the tide.

Thames rules, port state control and the cargo trades

The Port of London Authority manages navigation on the tidal Thames, sets pilotage rules and controls movements, and a gauging visit has to fit those rules. Port state control for foreign ships is the responsibility of the Maritime and Coastguard Agency, and the UK has applied the Paris MoU regime through domestic law since leaving the EU. Bulk carriers and general cargo ships with weathered hatch covers or holed deck plating are typical findings, and a recent record of thickness gauging helps a manager show that the structure is monitored.

Several trades here come with their own scrutiny. Car carriers are audited by vehicle manufacturers whose logistics teams look at ramps, lashing arrangements and deck condition, while grain shippers inspect holds for cleanliness and cargo readiness. Cruise ship operators run long-term maintenance plans and often ask for piping readings on a rolling basis. The EU Ship Recycling Regulation's Inventory of Hazardous Materials is expected on ships entering EU ports, but the UK has its own rules, so owners trading across the Channel often keep both sets of paperwork aligned.

Ships trading to Tilbury 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 Tilbury

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

London City, Heathrow, Gatwick and Stansted all serve the area, and Tilbury is reached by road or by rail from London Fenchurch Street. The port controls entry to the docks, and passes are issued through the agent or the terminal operator. Technicians travel from India on UK visas, applied for once the job is confirmed, and owners with regular Thames calls can keep visas valid so that mobilisation follows the vessel's schedule. Launch work at the anchorages is booked by the ship's agent.

• 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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