Nomogram for Determination of CCAI

08028-0D/H5250/94.08.12

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L23/30H

The combining straight line across density (990 kg/ m³) and viscosity (180 cSt) of a heavy fuel oil results in CCAI (869). From CCAI conclusions may be derived with regard to the ignition qualities.

CCAI may be calculated with the aid of the following formula:

CCAI = D - 141 log log (v + 0.85) - 81.

Ignition quality is an important fuel parameter. The reason why it does not appear in the international specifications is that there are no standardized testing method.Therefore,parameterssuchastheCalculated Carbon Aromaticity Index (CCAI) are resorted to as an aidwhichisderivedfromdeterminablefuelparameters. According to our experience only a rough assessment of the ignition quality of the heavy fuel oil is possible with the help of this method.

However, the CCAI has become so well-known in widespread publications that, in spite of the reservations mentioned above, we were compelled to classify the respective MAN B&W Diesel A/S, Holeby engines according to CCAI-rating, too.

General

The combining straight line across density (990 kg/ m³) and viscosity (180 cSt) of a heavy fuel oil results in CCAI (859). From CCAI, conclusions may be derived with regard to the ignition qualities.

CCAI may be calculated with the aid of the following formula:

CCAI = D - 141 log (log (v + 0.85)) - 81

Ignition quality is an important fuel parameter. The reason why it does not appear in the international specifications is that there are no standardized testing method is non-existent. Therefore, parameters such as the Calculated Carbon Aromaticity Index (CCAI) are resorted to as an aid which is derived from determinable fuel parameters. According to our experience, only a rough assessment of the ignition quality of the heavy fuel oil is possible with the help of this method.

However, the CCAI has become so well-known in widespread publications that, in spite of the reservations mentioned above. We were compelled to classify the respective MAN B&W Diesel A/S, Holeby engines according to CCAI-rating, too.