Originally Posted by texastrain:
All.... In my experience within the oil refinery industry, and personal experience with diesel equipment- #2 fuel has a higher degree of unrefined sulfur in it, that is the major difference between #1 and #2 grades. Also, hands on experience with burning higher degrees of sulfur grade fuels in furnaces located in a Rohm and Haas Chemical plant... per the "expert engineers" opinion, to use lower cost fuels. After a couple months we had to completely rebuild the furnaces due to the chemical changes in the sulfur compounds, creating sulfuric acids, which ate away at the firebrick and carbon steel tubes, furnace shells, etc. No doubt, this would also be a problem with burning a higher percentage of sulfur contaminants in any type of firebox.
Bunker oil is typically well over 0.5% sulfur (allowed to be as high as 3.5% in non-ECA areas), and steam locomotives had been burning it for years. Bunker oil is still used extensively in low speed diesel engines in marine applications, and yes, it is very corrosive. #2 diesel fuel, prior to the change to ULSD (ultra low sulfur diesel), typically averaged around 0.2% sulfur. Diesel engines loved the stuff, and with the right TBN oil, and lubricating oil analysis, did not cause problems. Today's #2 diesel sold in this country, and used in locomotive service, is ULSD at 15 ppm.
Here is a pretty good overview of different oils:
https://en.wikipedia.org/wiki/Fuel_oil
Now here is where I don't quite follow the statement that Hot Water has made in regards to the use of #2 diesel fuel. In the Trainorders thread referenced above, Hot made the following statement. I've bolded a comment in regard to CPR 2816.
Today's oil burning steam locomotives, 4449, 844, 3985, 3751, etc., generally burn waste oil, i.e. re-claimed crankcase oil drainings. The stuff is reasonably cheap, doesn't have to be heated much, if at all in summer months, burns reasonably clean, and is readily available nation-wide. That said, I know that 4449 and 844 have had to use diesel fuel, from time to time, with absolutely no burner changes nor firing complications. In fact, the CPR Empress Hudson, 2816, has been using standard RR locomotive diesel #2, ever since she has been in service on the CPR operation.
Were there boiler issues on the 2816 during her time running #2 diesel? That used to be a pretty well run operation, and I don't remember anything regarding boiler issues with her, but then again, I'm not that close to the steam locomotive community. If she ran fine on the CPR, then #2 diesel fuel, in and of itself, is not the whole issue here. What other factors, when firing the locomotive with #2 diesel, cause issues?
Regards,
GNNPNUT