In speaking of Bunker Fuel Oil, what is the difference between IFO-240 cst and IFO-180 cst and IFO-380 cst?

Question

In speaking of Bunker Fuel Oil, what is the difference between IFO-240 cst and IFO-180 cst and IFO-380 cst?

Answer 1

I have not been able to find the standard IFO however the numbers represent the viscosity of the oil measured in centistokes (cst). The lower the number the thinner the viscosity.

Some bunker oils are so thick that heat must be applied in order to pump the fuel and to inject the fuel into the engine's combustion chamber.

Answer 2

Bunker fuel is technically any type of fuel oil used aboard ships. It gets its name from the containers (known as Bunker Tanks) on ships and in ports that it is stored in, called bunkers. Bunker A is No. 2 fuel oil, bunker B is No. 4 or No. 5 and bunker C is No. 6. Since No. 6 is the most common, "bunker fuel" is often used as a synonym for No. 6. No. 5 fuel oil is also called navy special fuel oil or just navy special, No. 6 or 5 are also called furnace fuel oil (FFO); the high viscosity requires heating, usually by a reticulated low pressure steam system, before the oil can be pumped from a bunker tank. In the context of shipping, the labelling of bunkers as previously described is rarely used in modern practice.

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