Technical Discussion

• CCAI requirement
• Zoe Zhang
  Glorywealth Shipping Pte Ltd
  GMT 03:38
  9th Apr 2008

  Hi,
  
  If bunker quality conforms to ISO 8217:2005(e) specs, does it mean the CCAI is to be within certain level?
  
  Thanks/Regards
  Zoe
• Unni Einemo
  Petromedia Ltd (UK)
  
  GMT 12:53
  9th Apr 2008
  IP: x.x.2.243

  The calculated carbon aromaticity index (CCAI) is an index of the ignition quality of residual fuel oil.
  
  It was not part of the ISO 8217 standard in 1996, and as far as I know it was not included in the updated standard either (ISO 8217:2005).
  
• Zoe Zhang
  Glorywealth Shipping Pte Ltd
  GMT 19:32
  9th Apr 2008
  IP: x.x.8.11

  Is there an acceptable figure or range?
• Niomar Marcano
  Rooters
  GMT 16:28
  12th Apr 2008
  IP: x.x.179.190

  CCAI is not part of the ISO standard. However, CCAI is used to estimate how long the fuel will take from injection to ignition and the effect on the engine operation.
  
  In general, from 920 to 900, you should not operate on this fuel. From 900 to 880 there might be possible combustion problems and, from 860 to 840 is the range suitable for trouble free operation.
• Marco Collyer
  Petrobras Bunkering
  
  GMT 14:55
  27th May 2008
  IP: x.x.65.2

  CCAI for while is not an official requirement for specification of marine fuels. Hence, in annex B(INFORMATVE) of ISO 8217:2005(E) there is some explanation for calculated carbon aromaticity index value which is directly related to kinematic viscosity and density. And we can find also a nomogram for deriving CCAI. However , we have to bearing in mind that ignition performance depende of each engine type (manufacturer)and , more significantly , by engine operating conditions , including temperature condition. The limits for ignition quality can be problematical to one engine and satisfactory to others. The acceptable ignition quality values should be obtained from the engine manufacturer. Collyer- PETROBRAS