Scores are relative 0–100 marks within this atlas. Use them to browse, not as an engineering spec.
Last reviewed Sources & creditsMedia creditsMethodology
Quick answers
Which local authority or corridor rules matter for this type?
Start with the local lens: type approval, operator licences and the hubs named on this page — not a single global checklist.
Is this a buying guide?
No. Tool-Lifes /vehicles is an educational atlas. It explains history, systems and culture without affiliate rankings.
Are the scores official?
No. The six scores are relative editorial 0–100 marks across the 48 types on this site.
Where do the photos come from?
Lead images resolve from Wikimedia Commons via Wikipedia titles on the English masters, with licences recorded on the credits page.
Why metric units?
Metric is the default. Regional notes (US customary, local brand culture) appear in culture and market chapters.
How is this different from a wiki article?
Each type gets seven fixed-depth chapters, comparable scores and cross-type labs — structured for browsing, not a single freeform page.
Every Bulk carrier is a negotiated stack of structure, energy conversion, control and human interfaces under weather and regulation.
The systems, meters and hotspots below are type-level engineering — manufacturers vary; load paths and failure modes do not.
Systems
Single-skin cargo holds
Large hopper-style holds with topside hatch covers accept grabs or conveyor loading. No cellular grid—cargo free-flows to bilge sumps with heavy-duty pumping.
Main engine & propeller
Two-stroke slow-speed diesel with fixed-pitch prop optimized for economical 12–14 knot ocean passage. Long stroke and low RPM favor fuel over speed.
Ballast & loading computer
Sequential loading and deballasting maintains hull girder stress limits and stability during port turnaround.
Cargo grab / shore gear
Shore cranes with grabs or continuous unloaders set port stay duration; hold coatings resist abrasive ore.
Ventilation & gas detection
Hold vents and O₂ monitors manage self-heating coal and fumigation residues on grain.
Bridge & loading instruments
Draft gauges, stress monitors, and ECDIS support ocean routing and port loading plans.
Relative meters
Hotspots
Hatch cover seals
Leaks wet cargo and cause list; hydraulic cleats fail from corrosion.
Hold corrosion
Abrasive cargo strips coatings; pitting weakens bulkheads over years.
Ballast system biofouling
Treatment system faults block discharge in regulated ports.
Self-heating cargo
Coal spontaneous combustion triggers hold CO alarms mid-voyage.
Main engine lube
Contaminated fuel or low BN oil causes liner scuffing on long trips.
Materials
Corrosion-resistant hold paint
Epoxy systems extend time between hold recoating after aggressive cargoes.
High-tensile hull steel
Lightweight scantlings increase deadweight tonnage on size-constrained routes.
Mn-bronze propeller
Large slow-turning blades minimize cavitation on heavy displacement.
Marine VLSFO / HFO
Residual fuels dominate; LNG dual-fuel newbuilds cut SOx on fixed routes.
Keep exploring
More in Sea
Container ship
Cellular freighters that carry the TEU boxes of globalized trade.
Overall 57 🚢Cruise ship
Floating resorts built for itineraries, not point-to-point migration.
Overall 47 ⛴️Ferry
Scheduled water links for people and vehicles across straits and islands.
Overall 59 ⛵Sailboat
Wind-driven hulls from dinghies to ocean racers — sport, cruise and heritage.
Overall 53 🛟Submarine
Vessels designed to operate submerged — naval power and research platforms.
Overall 46 🛢️Oil tanker
Tank ships that move crude and products — the liquid spine of global energy trade.
Overall 45 🛳️Aircraft carrier
Floating airfields that project naval air power across oceans.
Overall 50 🧊Icebreaker
Ships built to crush and ride over ice — keeping polar and winter ports open.
Overall 43 🚤Tugboat
Compact high-thrust harbour craft that push, pull and pivot ships many times their size.
Overall 45