Thickness Gauging for Gas Carriers, Chemical Tankers and Bulkers at Terneuzen

Inspection services for ships at Terneuzen

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

Where gauging happens around Terneuzen's locks and canal zone

Terneuzen is not a docking port for seagoing ships. Vessels that need a drydock go across the estuary to Vlissingen-Oost or to yards further afield, and the Terneuzen call is used to gather the readings that size the steel work before they go. The practical settings are the chemical and gas jetties, the canal-side quays at Sluiskil and beyond, and the outer harbours on the estuary. At the chemical jetties every activity on deck is governed by the terminal's safety rules, and ignition sources are tightly controlled. Battery-powered gauges still count as electrical equipment in a hazardous zone, so each terminal decides what may be used where, and the equipment list goes to the agent well before the ship berths.

Inside the canal, ships loading fertiliser or discharging bulk lie at quays where the main constraint is the cargo plan rather than gas safety. Holds can be gauged once swept, and ballast tanks once the crew has emptied and ventilated them, which suits a team working steadily through the day while cargo continues at other hatches. Ships idle between fixtures, or waiting for an outbound lock slot, sometimes lie at lay-by berths in the canal or the outer harbours, and these are the best places for a longer pre-purchase or owner's condition survey. When a Terneuzen tanker, a Vlissingen docking and a Ghent bulker fall in the same fortnight, the team can be routed through all three without returning home.

• Chemical and gas jetties serving the Dow complex — deck structure, piping and ballast tank gauging under the terminal's permit; cargo tanks and hold spaces only once gas-free.
• Ammonia and fertiliser berths at Sluiskil — hold, hatch coaming and tank-top gauging on bulk carriers before loading, and ballast tank work on ammonia carriers.
• Canal-side dry bulk and project cargo quays — hold frame, bracket and hatch cover readings once grabs or cranes have finished.
• Outer harbours on the Westerschelde side of the locks — piping, deck and tank gauging on ships that call without entering the canal.
• Lay-by berths in the canal zone — longer owner's condition, pre-purchase and on-hire surveys on ships waiting between cargoes.
• Westerschelde anchorages — a limited, weather-dependent scope by launch for ships waiting for a lock slot or the tide.

Inspectors, chemical cargoes and climate rules at Terneuzen

Port state control at Terneuzen follows the Paris MoU and is carried out by the Inspectie Leefomgeving en Transport (ILT). Gas carriers and chemical tankers trading here also face the heaviest commercial scrutiny in shipping: vetting under the SIRE and CDI inspection schemes looks at ballast tank coatings, structural condition and piping, and an inspector who finds wastage or a weeping pipe will record it. Owners who gauge ahead of a vetting date, and repair what the readings show, arrive with answers rather than explanations, and the observation never reaches the report.

The EU rules that bind every ship calling at an EU port weigh on this fleet too. Ships of any flag need an Inventory of Hazardous Materials under the EU Ship Recycling Regulation, and larger ships report emissions under the EU ETS and FuelEU Maritime. The canal zone is also preparing for a different industrial future, with low-carbon ammonia, hydrogen and carbon capture projects under discussion around the chemical and fertiliser plants. For owners of ageing ammonia and gas carriers, that adds weight to the question of whether a double hull has the margin for another survey cycle, and thickness data answers it in steel rather than in estimates.

Ships trading to Terneuzen 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 Terneuzen

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

Brussels Airport and Amsterdam Schiphol both serve Terneuzen; from Brussels the road runs past Ghent to the border, and on the Dutch side the Westerschelde tunnel links Terneuzen with Zuid-Beveland. Chemical sites in the canal zone run their own safety inductions on top of ISPS gate control, so the ship's agent passes the team's names and certificates to the terminal in good time. Technicians coming from India need Schengen visas, which we apply for as soon as the call window is known, and travel is tied to the agent's lock-slot forecast.

• 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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