Reference
Specialized
Ships built for one trade. What it carries, how it is built and the limits that define the class.
- Cargo gear
- Purpose-built handling equipment
- Capacity measured in
- Varies entirely by trade
- Typical size
- Purpose-built rather than standardised
- Cargo type
- Trade-specific
About specialised vessels
Some cargo cannot be poured into a hold, pumped through a pipeline or packed into a box. Specialised ships exist for those trades, each built around a single cargo type rather than for general employment.
The specialisation shows in the equipment: heavy-lift derricks rated for hundreds of tonnes, stern ramps for rolling cargo aboard, multi-deck ventilated pens for livestock, or refrigeration plant holding a hold at a set temperature.
These ships trade in narrower markets than general tonnage, so availability is thinner and rates less liquid — but for the cargo they are built for, there is usually no practical alternative.
What it carries
How it is built
- A hull and equipment fit built around one cargo type rather than general trade.
- Purpose-built handling gear — heavy-lift derricks, stern and side ramps, ventilation systems or refrigeration plant, depending on the trade.
- Structure reinforced where that specific cargo demands it, whether for point loads, vehicle decks or multiple tween decks.
Why it is used
- Handles cargo that no general-purpose ship can take safely or economically.
- Purpose-built handling equipment keeps port time short in trades where shore facilities are limited.
- Often the only practical option for the trade it serves.
What to check before fixing
- A narrow trade means limited availability and less competitive pricing than open-market tonnage.
- Ballast legs are common, because the specialised fit often has no return cargo.
- Many of these trades carry their own regulatory regime on top of normal cargo rules.
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