Bulk cargo refers to commodities that are transported unpackaged in large quantities, loaded directly into the hold of a ship, railcar, or truck rather than in containers, boxes, or pallets. Bulk cargo includes two main types: dry bulk (grain, coal, iron ore, cement, fertilizer) and liquid bulk (crude oil, chemicals, liquid natural gas). For companies in commodity industries, bulk shipping economics differ significantly from conventional packaged freight.
Dry Bulk vs. Liquid Bulk
- Dry bulk: Granular or powdered commodities loaded via conveyor, pneumatic pump, or gravity chute. Transported in bulk carriers, open-top railcars, or pneumatic tanker trucks.
- Liquid bulk: Fluids transported in tanker ships, tank railcars, or tank trucks. Requires specialized loading/unloading infrastructure at both origin and destination.
Bulk Cargo and Cost Economics
Bulk shipping typically achieves the lowest cost per ton-mile of any freight mode because the absence of packaging and unitization allows maximum cargo density per vessel or vehicle. However, bulk transport requires specialized infrastructure — dedicated terminals, specialized loading equipment, and appropriate storage — making it practical primarily for commodity producers and large industrial purchasers rather than general merchandise shippers.