Ship Thickness Measurement in Delfzijl on the Ems Estuary

Inspection services for ships at Delfzijl

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

Where ships are gauged in Delfzijl

Royal Niestern Sander is where Delfzijl dockings happen. Dockings there often include blasting and recoating as well as the class survey, so gauging is timed to the yard's sequence: bottom and shell readings once the hull is clean, then tanks and holds as they are opened and ventilated. Superintendents use the first days to settle the steel list with the class surveyor, because renewals in a busy yard have to be scheduled before the blasting and coating crews move on. Conversions bring their own gauging requirement, which is to measure the existing structure where new foundations, deckhouses or equipment will be welded on.

Afloat, the industrial berths at Oosterhorn and the general cargo quays are the main workplaces. Chemical berths apply their own permits and gas detection, and tank entry waits for cleaning, ventilation and a gas-free certificate; deck piping and manifolds can often be measured during the stay. At the bulk and general cargo quays, holds become available as they are discharged and swept. Ships with an afloat repair period but no docking lie at the yard's quays or at lay-by berths, where tank and piping gauging can define the repair list. Ships too large or too deep for Delfzijl dock at bigger yards elsewhere on the North Sea coast.

• Royal Niestern Sander docks — renewal and docking survey gauging on multipurpose ships, coasters and offshore vessels, timed to the yard's blasting and steel programme.
• The yard's conversion berths — readings on existing deck and hull structure before new foundations, gangways or deckhouses are fitted.
• Chemical park berths at Oosterhorn — cargo piping, manifold and ballast tank gauging on small chemical tankers within the terminal's permits.
• Bulk and general cargo quays — hold, tank-top, hatch cover and coaming readings between discharge and loading.
• Lay-by and repair quays — tank and piping gauging on ships in afloat repair periods or waiting for their next voyage.

Chemical cargoes, ageing short-sea tonnage and inspection in Delfzijl

Ships in Delfzijl come under Paris MoU port state control, carried out by the Dutch Human Environment and Transport Inspectorate (ILT). The chemical tankers serving the industrial area fall under the ESP Code and IACS UR Z10.3, which make each renewal survey heavier than the one before, and chemical charterers vet small parcel tankers as closely as large ones. Cargo lines that carry caustic soda, acids and other aggressive products, and ballast tanks bordering heated cargo tanks, are where wastage tends to appear first, so those areas lead most tanker scopes here.

Many of the coasters and multipurpose ships calling at Delfzijl are below the 5,000 GT threshold of the EU ETS, so the pressure on older tonnage comes less from carbon rules than from charterers and from the steel itself. When a ship approaches its fourth or fifth renewal survey, the extent of steel renewal decides whether it keeps trading, is sold or goes for recycling, and every ship of 500 GT or more calling at an EU port already has to carry an Inventory of Hazardous Materials for that last step. A condition gauging before the survey gives the owner the facts for that choice.

Ships trading to Delfzijl 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 Delfzijl

The sequence for a thickness measurement job at Delfzijl is short and written down, so the yard, the surveyor and the superintendent know who arranges what.

International arrivals usually come through Amsterdam Schiphol, with rail onward to Groningen and Delfzijl; Groningen Airport Eelde and Bremen Airport in Germany can suit some routings. The yard and the industrial berths sit behind controlled gates, and chemical terminals often require a safety induction, which the ship's agent or the yard arranges in advance. Technicians travel from India on Schengen visas, so we need the docking or arrival date early enough to apply in good time and to book travel to the confirmed day.

• 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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