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Topic: Cetane number

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	Cetane number (Bruce Hamilton)
		The cetane number is then determined by interpolation, and the higher the Cetane Number, the shorter the delay between injection and ignition.
		The octane number of normal alkanes decreases as carbon chain length increases, whereas the cetane number increases as the carbon chain length increases.
		The significance of the cetane number increases with the speed of the engine, and large, low speed diesel engines often only specify viscosity, combustion and contaminant levels, as Cetane Number requirement of the engine is met by most distillate and residual fuels that have the appropriate propeties.
	yarchive.net /car/cetane_number.html (1164 words)

	Syntroleum - Specifications
		A minimum cetane number of 40 is specified for diesel fuels in the United States and 50 in Europe, as well as most other parts of the world.
		Such a high cetane number allows Syntroleum’s fuel to be effectively blended with lower-quality diesel fuel components to produce higher-quality fuels with positive economic benefits for the refining industry.
		Yet, aromatics decrease the cetane number to the diesel fuel and have been identified as contributors of NOx and PM emissions, especially ploynuclear-aromatics.
	www.syntroleum.com /tech_specifications.aspx (1884 words)

	Prepared to Respond (P2R) Services - Additives Brocure Insert - Cetane Improver for Diesels
		Cetane number is a measure of the ignition and combustion quality of diesel fuel; the higher the cetane number, the more efficiently the engine operates.
		A cetane number of 40 is a common specification in contracts and for pipelines, while a higher cetane number is often required by fleet operators for over-the-road operations.
		While the effective treating rate depends on the base cetane number of the fuel and the amount of cetane increase desired, a rule of thumb is that a treat rate of 600 ppm will improve the cetane number of a diesel fuel by three numbers.
	www.bakerhughes.com /bakerpetrolite/p2r/additives_cetane.htm (444 words)

	Cetane number (Bruce Hamilton)
		The cetane number is then determined by interpolation, and the higher the Cetane Number, the shorter the delay between injection and ignition.
		The octane number of normal alkanes decreases as carbon chain length increases, whereas the cetane number increases as the carbon chain length increases.
		The significance of the cetane number increases with the speed of the engine, and large, low speed diesel engines often only specify viscosity, combustion and contaminant levels, as Cetane Number requirement of the engine is met by most distillate and residual fuels that have the appropriate propeties.
	www.yarchive.net /car/cetane_number.html (1164 words)

	Fuels and Lubricants, Page 1 of 2
		In general, the research octane number tends to be about 6-10 points higher than the motor octane rating (for what is essentially the same gasoline).
		The cetane number of a diesel fuel refers to the ease with which a diesel fuel ignites.
		High cetane numbers mean that the fuel will ignite with relative ease or that it ignites well at low temperatures.
	www.procarcare.com /icarumba/resourcecenter/encyclopedia/icar_resourcecenter_encyclopedia_fuels1.asp (2257 words)

	Biodiesel
		The Cetane Number is a measure of the ignition qualities of diesel fuel.
		As a reference fuel it was assigned a cetane number of 100.
		The higher the cetane number of a diesel fuel, the better the ignition and combustion and the softer and better the concentricity.
	www.biodiesel.de /index.php3?hid=014110&spid=2 (173 words)

	Advantages of Using biodiesel
		The cetane number is an indication of a fuels readiness to autoignite after it has been injected into the diesel engine.
		The usual effect of a high cetane number is to shorten the ignition delay period between when the diesel fuel is injected and when it actually ignites.
		The research shows that biodiesel's higher cetane number does shorten the ignition delay and biodiesel's lower volatility also tends to reduce the rate at which fuel is prepared to burn during the ignition delay period.
	www3.me.iastate.edu /biodiesel/Pages/biodiesel8.html (1765 words)

	Sasol Internet (Site not responding. Last check: )
		Cetane is essentially the inverse of octane and applies to diesel fuel, i.e.
		The higher the cetane number of the fuel, the easier it is for the fuel to undergo spontaneous ignition when subjected to the elevated pressures and temperatures in the combustion chamber.
		In Europe the cetane number is increasing from a typical value of 49 to 51.
	www.sasol.com /sasol_internet/frontend/navigation.jsp?navid=6600001&rootid=599999 (407 words)

	Biodiesel Magazine
		Cetane 2000 is the first analytical tool that includes analyses for density, cetane number and cetane index plus cetane improver, total aromatics, polynuclear aromatic and biodiesel content in the same portable instrument.
		The cetane number was the average of the multi-rated results, optimizing the chance of an accurate cetane number.
		The correlation between the measured cetane number and the spectral data obtained using Cetane 2000 is outstanding.
	www.biodieselmagazine.com /article.jsp?article_id=574 (940 words)

	OGEB/EICB - Gasoline and Diesel Fuel Survey
		Cetane number is a measure of the ignition quality of diesel fuel and influences combustion characteristics.
		A Cetane number of 100 is represented by cetane (n-hexadecane), a straight chain saturated hydrocarbon and the cetane number of 0 is represented by a-methyl naphthalene, an aromatic hydrocarbon with two benzene rings.
		Cetane Number was requested on an annual basis and was reported by 21 facilities/importers in the survey period.
	www.ec.gc.ca /cleanair-airpur/CAOL/OGEB/fuels/reports/fullreport/fullReport_p4_e.cfm (3163 words)

	cetane number definition - Dictionary - MSN Encarta
		cetane number definition - Dictionary - MSN Encarta
		measurement of diesel fuel ignition quality: the performance rating of a diesel fuel, expressed as the percentage of cetane in a mixture with 1-methylnaphthalene that shows the same ignition properties.
		The higher the cetane number, the better the performance.
	encarta.msn.com /dictionary_1861687365/cetane_number.html (114 words)

	CETANE NUMBER EFFECTS ON LDD PERFORMANCE
		Cetane number has potential impacts on cold start and driveaway, noise, vibration, and other driveability parameters as well as potential impacts on vehicle emissions performance.
		Cetane number may be enhanced with the use of commercially available additives or through blending components with naturally-occurring cetane number to achieve the desired quality level.
		The goal of this project is to determine the effects of cetane number ranging from 40 to approximately 55 on advanced LD diesel vehicle operability.
	www.crcao.com /annualreport/AVFL/avfl11.htm (591 words)

	Cetane in Diesel Fuel
		Cetane number should not be considered alone when evaluating diesel fuel quality.
		The cetane number of the sample fuel is determined by estimating between the two reference fuel points.
		While useful for estimating the cetane number of distillate fuels, this technique can not be applied to fuels containing additives that raise cetane number.
	www.globalfinest.com /tech/cetan.html (569 words)

	The Southern Aviator
		The cetane rating "is a measurement of the ignition quality of the fuel and influences combustion roughness," according to the ASTM D-975 spec for diesel fuel oils.
		When the angle is at the specified number of degrees, the volume of the pre-combustion chamber is then correlated to a series of reference fuels to determine the cetane number of the fuel.
		The octane number is the measure of a fuel's ability to resist auto ignition in the far reaches of the combustion chamber.
	www.southern-aviator.com /editorial/articledetail.lasso?-token.key=11637&-token.src=index&-nothing (819 words)

	About Diesel Fuel
		Number 4 Fuel Diesel Fuel is slightly lighter than industrial fuel oil and is used in low and medium speed engines that operate at a constant or near-constant speed, such as stationary power plants or railroad locomotives.
		Number 1 Diesel Fuel is commonly labeled at the pump as "Premium Diesel" or with a Cetane number of 44 or 45.
		Number 2 Diesel Fuel is usually labeled at the pump with a Cetane number of 40.
	www.flashoffroad.com /Diesel/DieselFuel/about_diesel_fuel.htm (1045 words)

	Cetane Boost Diesel Fuel Additive
		Cetane number is the measure of a diesel fuel's ignition quality.
		Cetane, the colorless, oily hydrocarbon on which the cetane number scale is based, has extremely good inginition quality and is assigned a cetane number of 100.
		The cetane numbers of North American diesel fuels may be as low as 37, which may cause startability and driveability problems.
	www.gosynthetic.com /cetane.htm (155 words)

	Diesel Fuel Additives
		Any benefit provided by a cetane number improver is immediate, whereas that provided by detergent additives or lubricity additives is typically seen over the long term, often measured in tens of thousands of miles.
		The increase in cetane number from a given concentration of EHN varies from one fuel to another.
		Given their number, it must be obvious that the quality of all diesel fuels is not the same.
	www.itow.org /fueladd.htm (3000 words)

	General Information on Vehicle Emissions Reduction - ADB.org (Site not responding. Last check: )
		The combustibility of a diesel fuel in diesel engines is characterized by its cetane number, which is a measure of its ability to undergo compression ignition under standard test conditions.
		Although a large number of studies of the impact of diesel on emissions have been performed, it has been difficult to identify which fuel properties can be manipulated to reduce emissions because different engines of the same or similar design can and have been observed to react differently to specific changes in fuel properties.
		Typical cetane values for straight run diesel are in the range of 50-55; those for highly aromatic diesel fuels are typically 40 to 45, and may be even lower.
	www.adb.org /vehicle-emissions/General/diesel.asp (3074 words)

	Chevron Fuel and Marine Marketing
		Cetane number and the cetane index are applicable primarily to gasoil and distillate fuels.
		The cetane number is a measure of the ignition/combustion quality of the fuel in a diesel engine.
		The cetane index is a calculated value, based on the density and the distillation of the fuel.
	www.fammllc.com /famm/fuel_guide_to_quality.asp (657 words)

	Recommended Guideline on Diesel Fuel (Site not responding. Last check: )
		Cetane number is a relative measure of the interval between the beginning of injection and autoignition of the fuel.
		Cetane number may be increased through the refining process or the blending of combustion ignition improving additives by fuel suppliers.
		It is not affected by the use of combustion improver additives; therefore it produces an indication of the base cetane number of the fuel.
	tdiclub.com /articles/Diesel_Fuel_Guidlines (1734 words)

	cetane number
		A substance that ignited very quickly, cetane (n-hexadecane) was arbitrarily given a rating of 100, and a substance that was slow to ignite, alpha-methylnapthalene (later called 1-methylnapthalene), was assigned a rating of zero.
		The cetane number is the percentage by volume of cetane in the mixture that has the same performance as the fuel being tested.
		In calculating the cetane number allowance is made for the 15-cetane rating of the heptamethylnonane, to keep the scale as it was.
	www.sizes.com /units/cetane_number.htm (575 words)

	Diesel Fuel Quality \| Oil Spot
		Ignition delay is measured by the Cetane Number test (ASTM D 613), which uses a single-cylinder, variable compres- sion ratio engine analogous to the Octane Number engine.
		The cetane content of the blend that matches the ignition delay of the test fuel is its Cetane Number (CN).
		Diesel engines vary widely in their cetane requirements, and there is no commonly recognized way to measure this value.
	www.milespetroleum.com /article10.ivnu (1521 words)

	:Digression on Diesel Fuel Properties-Cont----->>:
		The cetane number is the standard measure of this property although it is difficult to measure precisely and has been criticized in recent years for not accurately reflecting the autoignition conditions in modern turbocharged engines, particularly with alternative fuels.
		Cetane Index - The cetane index is a calculated quantity that is intended to approximate the cetane number.
		It is much cheaper to determine than the engine-based cetane number but its accuracy is limited to the type of fuel on which it is based.
	www3.me.iastate.edu /biodiesel/Pages/biodiesel17.html (923 words)

	Clean Air USA - Biodiesel Fuel is Better
		Cetane measures the tendency of diesel to autoignite in an engine, and is comparable to the octane number for gasoline.
		Higher cetane fuels have shorter ignition delay periods than lower cetane fuels.
		Fuels with a cetane number lower than the engine's minimum requirements can cause rough engine operation and may be more difficult to start, especially in cold weather or at high altitudes.
	cleanairusa.org /truck-cetane.html (533 words)

	Glossary of Terms and Concepts: C
		Cetane number (calculated) – the cetane number of distillate fuels as estimated from the API gravity and mid-boiling point by using a formula.
		Cetane improver – a substance which, when added to a diesel fuel, has the effect of increasing its cetane number.
		Cetane index – an approximation of cetane number based on API gravity and mid-boiling point of a fuel.
	www.analystsinc.com /glossaryC.html (2336 words)

	diesel fuel (Site not responding. Last check: )
		The cetane rating is a measure of the ignition quality of a diesel fuel.
		The higher the cetane number of a diesel fuel, the shorter the time lag from the moment when the fuel first enters the combustion chamber until it ignites.
		Cetane number rating is the percentage of cetane mixed with methyl-naphthalene to produce a similar ignition quality to that of the fuel being tested.
	www.freeautoadvice.com /diesel/dieselfuel.html (397 words)

	Renewable Energy, Energy Research and Development, CANMET Energy Technology Centre / Centre de la technologie de ...
		A number of renewable feedstocks have been successfully processed in CETC-Ottawa's hydrotreating reactor systems including canola oil, soya oil, yellow grease, animal tallow and tall oil (a by-product of the kraft pulping process).
		It has a cetane number (a measure of ignition quality) of around 100 - which is comparable to commercial cetane additives.
		The cetane number increases linearly with the concentration of SuperCetane, unlike commercial additives, whose impacts are limited above a certain concentration.
	www.nrcan.gc.ca /se/etb/cetc/cetc01/htmldocs/Publications/factsheet_supercetane_technology_e.htm (829 words)

	Units: C
		It is the percentage by volume of cetane which must be added to methylnaphthalene to give the mixture the same resistance to knocking as the diesel fuel sample being tested.
		Cetane is the name of a hydrocarbon compound whose molecules contain 16 carbon atoms and 34 hydrogen atoms, the 16 carbons being arranged in a long chain.
		The "removed" phrase is used when the number of generations in the descent from the common ancestor is not the same for both cousins: "r times removed" means the difference in the number of generations is r.
	www.unc.edu /~rowlett/units/dictC.html (9195 words)

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