Ship Thickness Measurement at the Port of Moerdijk on the Hollands Diep

Inspection services for ships at Moerdijk

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

Gauging windows at Moerdijk's terminals and quays

Work at Moerdijk is done afloat, and the way to make it succeed is to match the scope to the ship's routine. A feeder that calls every week can carry a ballast tank programme over several visits, with the crew emptying and ventilating one or two tanks on passage before each call. A short-sea ship that lies over at weekends offers a longer window for deck, hatch and hold readings. The container terminal's working rules set where the team may move during cargo operations, and the agent agrees boarding times with the terminal and the master so that gauging never competes with the lashing gangs or the cranes.

At the chemical and tank-storage jetties, safety rules govern everything on deck. Deck structure, piping and accessible voids are typical permitted work during a call, while cargo tanks wait until the ship is cleaned and gas-free. For a docking, ships go downriver to the repair yards at Schiedam and elsewhere in the Rotterdam area, and a Moerdijk call a few weeks earlier is the natural moment for a pre-docking steel estimate. Owners who keep a coaster or feeder on a Moerdijk rotation for years can also use the calls for periodic condition gauging, tracking wastage rates over time instead of discovering them at the renewal survey.

• Container and short-sea terminal — deck, hatch coaming and ballast tank gauging on feeders, spread over successive scheduled calls.
• Stolthaven Moerdijk and other tank-storage jetties — piping, deck and void-space readings on chemical tankers under the terminal's permit.
• Jetties serving Shell's chemicals park — external piping and deck structure checks between parcels, with tank entry only once gas-free.
• General cargo and bulk quays — hold, tank-top and hatch cover readings on coasters after discharge.
• Lay-over berths used between rotations — longer owner's condition and pre-purchase gauging while the ship is idle.
• Repair yards in the Rotterdam area — the docking destination where Moerdijk readings feed the steel plan.

Paris MoU, chemical-tanker scrutiny and short-sea economics

Moerdijk falls under the same Paris MoU port state control regime as the coastal Dutch ports, with inspections by the Inspectie Leefomgeving en Transport. Short-sea ships calling every week are seen by inspectors far more often than a deep-sea ship that visits once a year, and an older feeder with visible deck wastage or a corroded air pipe is an easy target. Coastal chemical tankers face, in addition, the vetting inspections of the chemical companies whose parcels they carry, where structural condition and piping integrity are part of the questionnaire.

The economics of short-sea shipping make the steel question sharper. Many feeders and coasters on these routes are older ships, and the EU ETS, which covers ships of five thousand gross tonnage and above, together with FuelEU Maritime, adds a carbon bill to every voyage. A smaller coaster may fall below the ETS threshold yet still need an Inventory of Hazardous Materials, which applies from a much lower tonnage. When a renewal survey approaches, owners weigh another cycle against sale or recycling, and measured thickness data on deck, bottom and ballast tanks is what that decision rests on.

Ships trading to Moerdijk 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 Moerdijk

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

Moerdijk is reached by road from Rotterdam or Breda, and the nearest airports are Rotterdam The Hague and Eindhoven, with Amsterdam Schiphol and Brussels the main long-haul gateways. Terminal gates are under ISPS control and the chemical sites add their own safety inductions, so the agent registers the team in advance. A team from India travels on Schengen visas, applied for once the target call is identified; because calls here run to a timetable, travel can be fixed to a specific berthing rather than an open estimate.

• 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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