Furnace oil is a dark viscous residual product used as a fuel in different types of combustion equipment. It conforms to IS:1593-1982 for fuel oils. Presently MV-2 grade (kinematic viscosity range of 125 to 180 CSt at 50°C) conforming to this specification is being marketed. It is used in a stricter sense to refer only to the heaviest commercial fuel that can be obtained from crude oil, i.e., heavier than gasoline and naphtha.
Furnace oil is a dark, viscous residual fuel oil which is obtained by blending residual products from various refining processes with suitable diluents usually middle distillates to obtain the required fuel oil grades. These fuel oil grades are similar in nature and have been marketed under different specifications in various countries. In India it is sold under BIS specification IS 1593-1982 (Reaffirmed 1997), Medium Viscosity Grade 2 (MV 2 – 180 cst FO)
Uses of Furnace Oil are:
1. As fuel for Power Generation in DG Sets
2. As fuel for Boilers/ Furnaces/ Air preheater/ Any other Heaters
3. Fuel/ Feedstock in Fertilizer Plants
4. Furnace oil is a class C product having Flash Point above 66°C. Since this is a residual fuel, there has to be gradual filtration system to prevent the filter choking and fuel nozzles choking. Due to its viscous nature, it has to be heated to improve its flow and to a proper temperature for proper atomisation. Normally gear pumps are preferred to avoid cavitation problems.