Fuel Oils - Viscosities

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

• T_F = T_C 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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