Comment:
The carbon residue value of a fuel depends upon the refinery processes employed in its manufacture. For straight run fuels, the typical value is 10-12% m/m, whilst for fuels derived from secondary conversion processing the value depends upon the severity of the processes applied. On a global basis, this is typically 15-16% m/m but in some areas can be as high as 20% m/m.
Info Centre >> Fuel and Lube Oil Technical Manual >> 2. Fuel Oil - Characteristics >> 2.6 Carbon Residue
The carbon residue of a fuel is the tendency to form carbon deposits under high temperature conditions in an inert atmosphere. It may be expressed as Ramsbottom Carbon Residue (RCR), Conradson Carbon Residue (CCR) or Micro Carbon Residue (MCR). Numerically, the CCR value is the same as that of MCR. The carbon residue value is considered by some to give an approximate indication of the combustibility and deposit forming tendencies of the fuel.
> 20 % | Problematic |
10 - 12 % | Straight run fuels |
15 - 16 % | Average |