Can FTIR be used for finding out fuel dilution ?
i heard that GC is used for fuel dilution .is it right?
frndz need your opinion on this?
Original Post
Read our primer articles on Oil Analysis and Tribology
Replies sorted oldest to newest
yes there is ASTM method using GC And it is very accurate giving you the exact value but it is complicated and expensive ,also there is FTIR method this is a ccomplished by measuring the absorption bands of sepcific components of the fuel,but it is not accurate as GC method
fageer,
i undersatand that we get fuel dilution in percentage and we have to compare with fresh oil,then what is the absorbance band in which we can detect fuel dilution
and how is this interpreted in percentage?
hope you can help..
i undersatand that we get fuel dilution in percentage and we have to compare with fresh oil,then what is the absorbance band in which we can detect fuel dilution
and how is this interpreted in percentage?
hope you can help..
Hi Hardy
The wave numbers are (deisel@800, gasoline @750,jet fuel @795*815) , You need to make standard curve by adding known amounts of the fuel to the fresh oil and meusure their absorbances and plot it against their percentages but as i told you before the precision of this method is very poor (+50%) so be carefull if you use it
Regard
The wave numbers are (deisel@800, gasoline @750,jet fuel @795*815) , You need to make standard curve by adding known amounts of the fuel to the fresh oil and meusure their absorbances and plot it against their percentages but as i told you before the precision of this method is very poor (+50%) so be carefull if you use it
Regard
Dear fageer,
it is a better way add known concertations of fuels in to the fresh oil and and record the flash point.
does this make sense.
it is a better way add known concertations of fuels in to the fresh oil and and record the flash point.
does this make sense.
GC is the absolute method for the determination of fuel concentration in oil. This method however requires a certain amount of expertise, knowledge and investments.
As for FTIR for fuel detection, the method relies on the presence of aromatic molecules basically coming from the sulfur additive (arround 3050, 1605, 874, 811, 748 cm-1). If low sulfur fuel is analyzed, FTIR won't tell anything. The method was working OK with 5000 ppm sulfur fuel in the past. It is not the same game with 50 ppm and 15 ppm sulfur content. Still, depending on the regions or on fuel batches, sulfur level weren't always be the same thus, method was not precise on a quantitative level.
Flash point can give you an idea, particularly if it is compared to viscosity. That is what I do in my lab but I must say that I analyze oil from our units weekly (close follow-up) and oil is always from the same type.
This method is however not fully reliable due to several possible interference: oil contamination (water, glycol, soot and other), hydrocarbon molecules shear down...etc. There was an interesting article talking about this subject in Practicing oil analysis a couple of months ago.
As for FTIR for fuel detection, the method relies on the presence of aromatic molecules basically coming from the sulfur additive (arround 3050, 1605, 874, 811, 748 cm-1). If low sulfur fuel is analyzed, FTIR won't tell anything. The method was working OK with 5000 ppm sulfur fuel in the past. It is not the same game with 50 ppm and 15 ppm sulfur content. Still, depending on the regions or on fuel batches, sulfur level weren't always be the same thus, method was not precise on a quantitative level.
Flash point can give you an idea, particularly if it is compared to viscosity. That is what I do in my lab but I must say that I analyze oil from our units weekly (close follow-up) and oil is always from the same type.
This method is however not fully reliable due to several possible interference: oil contamination (water, glycol, soot and other), hydrocarbon molecules shear down...etc. There was an interesting article talking about this subject in Practicing oil analysis a couple of months ago.
where can i find that article you are mentioning??
quote:Originally posted by hardy:
where can i find that article you are mentioning??
There are some fuel dilution chart available based on the flash point of the oil. If u get that, please do send a copy
There is an ASTM method for FUEL Dilution by FTIR E2412
But the problem with this method is it considers the the Aromatic Sulphur peak for the detection and quantification.Now days the fuel is low and ultra low sulfur fuels,this makes it difficult to detect using FTIR.
Also the standards are required to be prepared using a aromatic free base oil using the Actual Fuel used in that engine.This method is to be used as a trend analysis and GC is the best option.
But the problem with this method is it considers the the Aromatic Sulphur peak for the detection and quantification.Now days the fuel is low and ultra low sulfur fuels,this makes it difficult to detect using FTIR.
Also the standards are required to be prepared using a aromatic free base oil using the Actual Fuel used in that engine.This method is to be used as a trend analysis and GC is the best option.
