What is the normal consistency of no. 6 fuel-oil?

The correct answer, which describes the normal consistency of No. 6 fuel oil, is thick and heavy. No. 6 fuel oil, also known as bunker fuel, is one of the heaviest and most viscous types of fuel oil. It is commonly used in large commercial and industrial applications, particularly in marine vessels and power plants due to its relatively low cost compared to lighter fuels.

This thickness is due to its high density and viscosity, which results from its composition of long-chain hydrocarbons and impurities. When considering how this fuel oil is stored and handled, it often requires heating before use to reduce its viscosity and ensure proper flow through pumps and burners.

Understanding the characteristics of No. 6 fuel oil is crucial for operators as it affects how the fuel is managed, the equipment used, and the maintenance practices required to ensure efficient operation.