What a second shift actually buys on a refit

The lights in a ship repair district do not all go off together. Walk past the gates after dark: some halls are black, some have one bay lit, one has a full crew in it.

That unevenness makes an offer of compressed delivery worth testing. The programme is long, the owner wants her back earlier, and a Tuzla shipyard says it can man a second shift. Sometimes that is true. Sometimes the calendar shortens and the work does not, and the difference comes back at redelivery as rework.

One test separates the two, and it applies to the activity on the critical path, not to the programme as a whole. Either that activity is manning-elastic, meaning more hands finish it sooner, or it answers to something hands cannot hurry.

Why a Tuzla shipyard works after dark

Berth and dock time is the constrained item in ship repair. A hull occupying a quay, a dock or a covered bay consumes a resource the yard cannot make more of. Labour is the flexible input. That is why repair districts run late into the night, and why a yard district carries manning depth that a berth away from one does not.

Depth is the word that matters. A second shift is not one supervisor staying on but a full set of trades on the same evening, within walking distance of the berth: fitters, welders, platers, electricians, carpenters. In a district built around ship repair those people live nearby and have worked nights before. Outside one, a night shift means the day crew staying later.

A yacht refit in Turkey can sit inside a district of this kind or well away from one, on a marina hard or at a coastal service point. Where she sits decides whether a second shift is on the table at all, and that a Turkish yard can field one says nothing about whether one helps your yacht.

The only question that decides whether hands help

Take the activity that sets the redelivery date and ask what governs its duration. Some are limited only by the labour that can usefully be applied. Strip-out is the clearest case: a compartment cleared of joinery, insulation and redundant pipework empties faster with twice the hands in it. Cable pulling and insulation behave the same way, and so does the bench work behind a joinery dry fit. The dry fit aboard does not: it is limited by the compartment and by the order the carcase, faces and stone go in. Plate work only partly qualifies: cutting and fitting absorb hands, the welding sequence that controls distortion does not, and the permit and fire watch cover caps how much can run at once.

Those activities are manning-elastic. Buy shifts against them and that activity does finish sooner. Whether the programme does is a second question, because a shortened critical path does not stay where it was: compress strip-out far enough and the date begins answering to whatever was second in line, often something on the list below.

The other sort is not governed by labour at all. It answers to a clock, a sequence, or somebody's attendance, and shifts bought against it only crowd the compartment.

The work that answers to a clock, not to a crew

Four things on a refit refuse to compress, and they are usually where the date is held.

• Cure-bound work. The interval between coats belongs to the coating maker's data sheet rather than to the programme, and it answers to film temperature and humidity, not to the number of sprayers in the tent. A second crew does not make the previous coat ready. What it can shorten is the fairing, sanding and preparation either side of that interval, so a coating programme holds a core that will not move inside a shell that will.
• Settling-bound work. Bedded glazing and structural adhesives need undisturbed time before anything is loaded onto them. Resilient mounts need the opposite: the machine has to sit on them and be left there, so they take their static deflection before a final alignment is measured off them. Either way the waiting is the work.
• Sequence-bound work. Alignment is the standard example: a shaft line only means something when the structure around it is at an even temperature and the yacht is in the condition the reading was specified for, waterborne or on blocks, tanks as stated. That is why readings are often taken before sunrise, with no sun on one side of the hull. What breaks them is heat put into the same structure by parallel work, not the hour.
• Witness-bound work. Anything waiting on an attended hold point in a survey moves at the speed of the attending person's diary, which belongs to them and not to the yard. Some will come out in the evening, and some items close on records agreed in advance; which applies is settled in the specification.

What a second shift costs beyond the hours

An offer of extra shifts is priced as labour hours. Two things are not in that price.

Supervision and inspection have to run at the same density after dark. Work nobody competent watched being done is work that will be opened again, and if the night shift carries thinner supervision than the day shift, the hours are cheaper and the output is not comparable.

Hot work arrangements do not thin out either. Permits, gas-freeing, screening and fire watch after hot work all have to hold at night, in a yard where fewer people are about to notice smoke.

Compressing a programme spends the float

A compressed programme is also a programme with less float. Float is what absorbed the last piece of discovery: the frame thinner than the map said, the tank that opened up worse than it surveyed. Discovery arrives late, and what makes a refit programme slip is rarely the work that was scoped at the start.

Shifts bought against cure-bound or sequence-bound work also produce trade stacking: three trades in one compartment, each marking what the others have finished. Fairing gets knocked. A new sole takes a spatter burn. None of it appears as delay; it appears as rework, after the shorter date has been announced.

What to ask a Tuzla shipyard offering a shorter programme

Ask for the critical path as it stands, then which activities on it the extra hands go against. If the answer is strip-out, cable pulling, insulation, plate fitting or bench joinery, the compression is probably real. If it is the interval between coats, a commissioning sequence or anything with an inspection attached, time is promised against work that will not move. If it is the preparation either side of a coating interval, ask which of the two the hours go against.

Then ask what float remains once the programme is compressed, who supervises at night, and whether the hot work regime after dark is the day one.

Reviva refits and rebuilds at Tuzla, with joinery, metalwork, coatings, electrical and systems within a short walk of the berth. Proximity does not change which activities are manning-elastic. That is a conversation to have before signature rather than after the shifts are manned.

Written at the yard in Tuzla. Overcoat and cure intervals belong to the coating maker's data sheet, hold points to the specification and the attending surveyor, and no shift pattern or delivery date is stated here.