Viscosity of Fuel Oils

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Fuels Oils and viscosity versus temperature

Viscosity - Saybolt Universal Seconds SSU, versus temperature for typical fuel oils are indicated in the diagram below:

fuel oils - viscosity versus temperature

T(^oF) = [T(^oC)](9/5) + 32
SSU (Saybolt Universal Seconds) = Centistokes (cSt) x 4.55
4-5000 SSU is the maximum practical limit for pumping
150-300 SSU is the atomization range fuel oil no. 5 and 6

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