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VICT Correction Table (Viscosity Index Correction Table)

The VICT correction table is used onboard ships to correct or determine fuel oil viscosity at different temperatures, ensuring the correct viscosity at engine inlet (especially for HFO).

Why VICT is Required

  • Fuel viscosity changes with temperature

  • Main engines require a specific viscosity at injection (typically 10–15 cSt)

  • VICT helps engineers:

    • Set heater outlet temperature

    • Avoid poor atomization or pump damage

What the VICT Table Does

  • Converts fuel viscosity at one reference temperature (e.g., 50°C)
    ➜ to viscosity at another temperature

  • Or helps find the required heating temperature for a target viscosity

Where It Is Used Onboard

  • Fuel changeover calculations

  • HFO heater temperature setting

  • During:

    • Engine start on HFO

    • Load changes

    • Fuel viscosity controller checks

Typical Data Used

  • Fuel viscosity (e.g., 380 cSt @ 50°C)

  • Required engine inlet viscosity (e.g., 12 cSt)

  • Using VICT → find required fuel temperature (e.g., ~135–140°C)

Relation to Fuel Standards

Fuel viscosity values are normally provided as per
International Organization for Standardization fuel standard ISO 8217.

Example

Given:
Fuel oil viscosity = 180 cSt @ 50°C
Required engine inlet viscosity = 12 cSt

Using VICT table:
→ Required heating temperature ≈ 130°C (approx.)

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