Ship Gauging at Harwich: Ferries, Wind-Farm Vessels and Harbour Craft

Inspection services for ships at Harwich

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

Where gauging happens in Harwich and the Haven

Most work is alongside. A ferry at its berth offers a defined window, so we agree the programme with the superintendent weeks ahead and split it across several turnarounds if the ship's schedule allows. Vehicle decks are clear for a short time after unloading, ramps and hoistable decks can be read when parked, and void spaces and tanks are opened by the crew in the order we agree. For workboats at the Navyard or at smaller quays, the ship is usually in harbour for a day or more, which is long enough for a fuller tank scope.

Harwich has no large commercial drydock of its own, so ships needing a full renewal survey normally dock at yards elsewhere in the UK or across the North Sea in the Netherlands and Belgium. Readings taken here are used to prepare the steel estimate and the docking specification. At the Haven anchorages, boarding by launch is possible when sea state allows, and suits short deck, hatch and air-pipe scopes on vessels waiting for orders or a berth.

• Ferry berths at the international terminal: vehicle-deck plating, ramps, hoistable decks and sea-water piping between sailings.
• Navyard quays: tank, shell and deck gauging on pilot boats, buoy tenders and other harbour service craft.
• Wind-farm service berths: crew transfer vessels and service operation vessels read during rotational lay days.
• Dredger berths in the estuary: hopper, suction-pipe and wear-plate readings between dredging campaigns.
• Haven anchorages: short launch-borne scopes on ships waiting for orders, weather or a berth.

Port state control, the Haven authority and what drives inspection here

Port state control at Harwich is the responsibility of the Maritime and Coastguard Agency, and the UK has applied Paris MoU practice under its own legislation since leaving the EU. Ro-pax ferries come under both flag-state surveys and the specific passenger-ship inspection regime, so structural condition, watertight integrity and piping all feature in what inspectors look at. Vessels under UK flag in the workboat classes are surveyed under domestic codes rather than as full SOLAS ships, which makes class or administration records of hull thickness an important part of the file.

Offshore wind charterers expect well-documented vessels. Their contractors audit the technical condition of service vessels before and during contracts, and structural thickness records, along with evidence of corrosion control in ballast and fuel spaces, strengthen the owner's position at tender. Ferry operators face a similar discipline, with older tonnage kept in service by close monitoring of known wastage areas. Gauging at Harwich therefore serves owners who need to document condition for a charterer, a buyer or an insurer as much as those preparing for a class docking.

Ships trading to Harwich 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 Harwich

A gauging job at Harwich 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.

Stansted is the closest major airport, with Heathrow and Gatwick reached by rail or road; from Stansted the road or rail route to Harwich passes through Colchester or Manningtree. Harwich International and the Navyard control access with passes issued through the shipping line or the vessel's agent. Technicians travel from India on UK visas, applied for once the job is confirmed, and owners with regular calls benefit from valid visas already in place. Launches for the Haven anchorages are 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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