Dry-dock planning: the checklist that starts six months out

A dry-docking is a fixed-duration event competing for limited yard capacity, and owners who leave planning until a few weeks before arrival usually end up with a worse dock slot, a higher price and a specification put together in a hurry. Starting six to nine months ahead gives enough time to gather survey history, confirm class requirements and get budget approval before commercial pressure forces rushed decisions that are hard to reverse once the ship is already on its way to the yard.

The date is rarely arbitrary. It is normally set by the class renewal or special survey window, which falls on a roughly five year cycle, combined with flag state certificate renewals, charter party obligations and the vessel's trading commitments. Working backward from that date, rather than forward from when someone remembers the docking is due, is what keeps the whole process under control from the first meeting onward.

Early planning also gives the owner room to negotiate rather than accept whatever slot is left. A technical manager who approaches several yards six months out can compare price, schedule and technical fit properly; a manager calling around eight weeks before a survey deadline is usually just looking for anyone with an open dock, and that difference shows up later in both cost and quality. It also reduces risk on the vessel's side, since a superintendent who visits the shortlisted yards in person before booking, rather than relying only on emailed quotations, tends to catch problems, an overcrowded dock schedule, a crane under maintenance, unclear waste handling, that would otherwise only become apparent once the vessel has nowhere else to go. None of this is complicated in principle, it simply requires someone to own the calendar early rather than reacting to it later.

The specification, sometimes called the repair list, collects everything the docking needs to cover: mandatory class and flag items, steel renewal already flagged from earlier thickness measurement reports, tailshaft survey where due, plus the owner's discretionary work such as machinery overhauls, coating upgrades or accommodation repairs, and the defects the crew has been logging through the year.

A good specification separates firm, priced scope from optional or variation items, and gives yards enough technical detail, drawings, thickness data, spare parts already held on board, to quote accurately rather than guess. Vague or incomplete specifications are one of the most common reasons a docking ends up in dispute once work has already started, because a yard that quoted against assumptions has every reason to charge extra once those assumptions turn out to be wrong.

Building the specification is also where the owner decides who does what. Some items are best left to the yard's own trades, while others, particularly specialised machinery or electronics, may be better handled by the original equipment manufacturer or a dedicated service provider working alongside the yard under the same schedule. Deciding this early avoids duplicated quotes and unclear responsibility once the vessel is in dock. It is also useful to flag which items are safety critical and which are purely commercial, since class and flag surveyors will want early sight of anything affecting a certificate, while a delayed decision on cabin furniture rarely holds up the whole docking. A specification worth the name reads clearly even to someone who was not in the room when it was written.

Selection should weigh dock size relative to the vessel, the yard's track record with similar vessel types and scopes, its familiarity with the relevant class society and flag administration, its location relative to the ship's trading pattern, and commercial terms, in that order rather than price first.

Booking early secures an actual dock slot. Many yards run rolling calendars, and the windows around common special survey ages for a given vessel segment fill up fastest. A firm booking, with a clear cancellation and rescheduling clause, protects both the owner and the yard if trading plans shift before the docking date arrives, which happens more often than most planning schedules assume.

It is also worth asking how a yard handles overlap. A busy dock with several vessels booked close together can create pressure on shared resources such as cranes, staging and skilled labour, and a yard that is upfront about how it sequences overlapping jobs is generally easier to work with once the vessel is actually alongside and competing for the same crew. References are most useful when they come with specifics, how the yard handled a scope change, how it communicated a delay, rather than a general statement that the previous job went well, since almost every yard will say that about itself. None of these factors alone should decide the choice, but together they build a picture that price alone never can.

A docking usually combines the class renewal or special survey, an in-water or bottom survey, tailshaft survey where the interval is due, and hull thickness measurement carried out by an approved firm, alongside flag state certificates that are conventionally renewed at the same time such as load line and safety construction related items.

Surveyor attendance needs to be coordinated with the yard's own schedule, since surveys often gate other work: steel renewal cannot be finalised until thickness measurement results are in, for example. Building a realistic float into the schedule for survey findings that expand the original scope is what separates a docking that finishes on time from one that does not.

It also helps to confirm in advance which surveys can be witnessed remotely or combined with a sister vessel's programme, and which absolutely require the attending surveyor in person. Some flag and class administrations allow flexibility here, and knowing the answer before the docking starts avoids losing days waiting for a surveyor's availability that could have been arranged weeks earlier. Owners with several sister vessels sometimes align survey scopes and even surveyor visits across the fleet, which can reduce travel costs for the class society and, in some cases, shorten the individual attendance needed on each vessel. A short pre-docking meeting with the attending surveyor, even by phone, usually clears up more than a long email chain.

Certain items, anodes, specific valves, particular grades of steel plate, complete coating systems and tailshaft seals, carry long lead times, and ordering them early avoids losing docking days waiting for a delivery once the vessel is already alongside. Whether an item is owner-furnished or yard-furnished should be settled during specification, not discovered once the vessel is in dock.

Getting spares to the yard on time, clearing imported items through customs, and coordinating deliveries with a ship supply or logistics provider are logistics questions as much as technical ones. An operator that runs repair, supply and logistics together, as YEKE does from its Tuzla base, can plan this chain as one sequence rather than leaving the owner to chase several separate suppliers.

A practical habit is to build a single tracked list of every long-lead item with its order date, expected delivery date and the person responsible for chasing it, shared between the owner, the yard and any supply agent involved. On a large docking with dozens of such items, this kind of simple tracking prevents the single missing gasket or seal that ends up holding up an otherwise finished job. It is equally worth confirming warranty terms for major replaced items before the docking starts, since some manufacturers require their own commissioning engineer to attend, which is itself another mobilisation to plan around rather than a detail to sort out once the part is already fitted. Treating the spares list as a living document, updated as soon as anything changes, is far more reliable than a single list frozen months before the docking.

Once the vessel is in dock, daily progress meetings, tight control of variation orders, and clear safety coordination on a busy dock floor keep the job on the agreed schedule. Contingency should be expected for weather delays and for hidden damage that only becomes visible once staging is up or tanks are opened, rather than treated as a surprise each time it happens.

Undocking brings its own checklist: sea trials or dock trials for repaired machinery, close-out of every survey item with the class surveyor, handover of documentation and replaced parts, and a final reconciliation of invoices against the original specification and its agreed variations. A specification that was clear from the start makes this closing phase far less contentious than one that was vague.

It is worth keeping a running record throughout the docking, photographs of steel before and after renewal, thickness readings, coating film thickness logs, function test results, rather than reconstructing it all at the end. That record becomes the reference point for the next docking, and a yard or repair provider that maintains this kind of documentation as a matter of course saves the owner a great deal of work when the next survey cycle comes around. Owners who compare this record against the previous docking's file often spot patterns early, a coating system that keeps underperforming in the same tank, a component that fails sooner than its rated interval, which turns each docking into useful input for planning the next one rather than a stand-alone event. None of this needs to be elaborate, a shared folder and a habit of updating it daily is often enough.