Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about ______________°C?
Correct answer: C. 105
- A. 70
- B. 85
- C. 105
- D. 145
Explanation
Furnace oil must be heated substantially because its viscosity falls as temperature rises, improving atomisation at the burner. For reducing approximately 250 cSt oil to about 25 cSt, a preheating temperature near 105°C is the standard estimate.
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