⛽ Types of Ship Fuel – Understanding HFO vs MDO
Ships rely on two primary types of fuel to power their engines across the world’s oceans:
Heavy Fuel Oil (HFO)
Also known as bunker fuel, HFO is a thick, viscous residual oil derived from crude oil refining. It is cheaper but requires heating (often to 60–120°C) and extensive purification before use due to its high viscosity and impurities. Commonly stored in large settling tanks and spherical bunkers.
Marine Diesel Oil (MDO)
A lighter, refined distillate fuel that flows easily at ambient temperatures. It is cleaner-burning, requires less pre-treatment, and produces fewer emissions. Typically stored in smaller, dedicated tanks and used for auxiliary engines or in emission control areas.
Understanding the difference between HFO and MDO is essential for marine engineers, as it affects fuel management, heating systems, purification processes, and compliance with environmental regulations like IMO 2020.
Choosing the right fuel ensures efficiency, safety, and regulatory compliance at sea.
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