![]() It now has fewer grades but many more rules regarding "inclusions". The CIMAC fuel standard is based on the ISO 8127 standard. In all these places the reference temperature is 50☌.ĬIMAC working bodies have now decided that for many reasons the reference temperature used throughout will be 50° However, it is only the refineries that they blend at these temperatures in terminals, on barges, on ships and in power stations the storage temperature and transfer temperatures are often much lower. Heavy fuels oils traditionaly are blended based on the 100☌ viscosity and blended at between 90 and 130° in refineries. RE: API 13 Fuel Oil Viscosity vs Temperature jmw (Industrial) 30 Jun 04 10:18 Some modern viscometers for heater control will work on any fuel in power stations for burners and even on very dirty fuels. The downside is that because fuel quality is very variable, you need to re-assess the heater control temperature on a routine basis (this is repeated on a very regular basis even for a single fuel grade, because fuel quality is vary variable your data suggests you will be using different fuel grades), perform flame inspections and, probably, run excess oygen to around 4.5% or so. This was necessary because most viscometers did not work on heavy fuel oil to burners (though they do to engines). In burner applications it is more usual to measure the viscosity at one temperature in the lab, use a table such as this or a chart to predict the nozzle temperature and adjust the heater control set-point accordingly i.e. 15cSt and it returns the equivalent temperature for each of the oils. All you do in this column is enter your target viscosity e.g. You will also note that it includes provision for you to enter the density, if known, but this is only really used for engines where they want the ignition index.Īlso included is the heater control temperature to achieve the optimum injection viscosity. Then you can read of the viscosity at any other temperature from the table (you can adjust these temperatures). Some specifications also suggest the approx viscosity at 100☌(which is the second temperature in the pre-programmed oils) and this works very well.įor your specific oil, you may need to tweak the second temperature until you get the appropriate "A" & "B" values (proportionately the same at the second temperature as at the first). It is already pre-programmed with a number of heavy fuel oils.įor your oil, you should have at least one defined viscosity at the reference temperature, which you quote (150 - 480 cST 50C). I imagine you need to determine your heater control temperatures.ĭownload spreadsheet ASTM D341 from here: RE: API 13 Fuel Oil Viscosity vs Temperature Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora. If you can add some further information to help us understand your question, please do so.Įng-Tips: Pro bono publico, by engineers, for engineers. On the other hand, intermediate fuels and above are blended for their viscosity because viscosity is significant in the efficiency of operation and is controlled through fuel heating. there is no compensation for viscosity in engine management. Viscosity is no less variable but because, for light diesels, the viscosity is quite low, it is often disregarded (except for power factor correction injector performance testing etec.) i.e. I wonder if this is the description that you have (though API 13 sounds low, those that i have found are in the API 20-30 range). A common practise appears to be to refer to the API specific gravity measured for the batch. This means that deifferent batchs od diesel, and for aviation fuels, the density and viscosity can vary according to the conditions at the refinery.ĭensity can vary significantly (especially critical in aviation fuels where different batches are sepearately stored). Which i don't have but possibly your engineering standards library has this available.ĭiesel is usually blended for a specific energy content based on the cetane index. ![]() Product Number: F15714 / Price: Pack of 25 for $57.00 Normally used and their purposes and explanations of factors that can affect ![]() Included are explanations of the quality features of diesel fuel and their significance ĭescriptions of diesel fuel classifications discussions of additives Provides answers to some of the frequent questions asked about diesel fuel. Diesel FuelÑQuestions and Answers for Highway and Off-highway Use ![]()
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