cetane number and cetane index relationship

There are various versions of this, depending on whether you . The suitability of the current equation used in IP 380 (ASTMD 4737)/EN ISO 4264 for calculating Cetane Index (CI), for the prediction of Cetane Number (CN) as measured by IP 41 (ASTM D 613). ex- 1996 wagon, ex-2000 Jetta Jun 22, 2006 #7 Cetane Number measures the ignition quality of diesel fuel and for some reason people try to relate "quality" to this number. Whereas the octane number quantifies how long it takes before the gas can resist auto-ignition, the cetane index refers to how quickly it can become ignited inside a compression setting. Cetane Number is a numerical indication of a fuel s (kerosene, dic.sel, heating oil) ignition quality. Specifically, this measure is referred to as cetane number. Unauthorized use and/or duplication of this material without express and written permission from this sites author and/or owner is strictly prohibited. From increased fuel economy to fewer emissions to better power output, fast combustion is key to a diesel engines performance. It is a requirement of the European Specification for Automotive Diesel Fuel BS EN 590 that both the Cetane Number (CN) and Cetane Index (Cl) are determined and reported. Even if cetane isnt always on your mind, disregarding it can be costly. Therefore, a higher cetane index generally indicates that the fuel will combust more quickly in the engine. This method uses the density at 15C . The fuel's performance in other engines may differ. The cetane number of a diesel fuel is a measure of it as an index of the Ignition Quality (Ignition delay characteristics ) of diesel fuel which defines the way combustion proceeds in the engine . Simply put, cetane is a chemical compound found naturally in diesel, and it ignites easily under pressure. This version of the Cetane Index calculation uses the Api at 60F and only the 50% versus the D4737 using 3 distillation points. If CN increases = (shorter the time between fuel injection and rapid combustion or pressure rise), better ignition quality. It is the measure of ignition quality of fuel. Sanjeev has completed his B.Tech in Marine Engineering from Indian Maritime University Kolkata. It will give a calculated Cetane Index result within the range of 30-60 and is good for +- 2 numbers on the engine run. When a cetane number has been determined, a cetane index is used as a check. Do not copy paste. Other standards in the United States and Europe specify minimum cetane numbers of 40 and 51 [4], [5], [6]. As a result, the typical loud diesel combustion noise (knocking) is produced. What is temperature range for PTFE & RPTFE? Theres no shortage of options on the market, each with their own compelling claims. These are as follows: There are several ways of checking and improving upon the cetane index of fuels in order to attempt to raise the standard of their performance in an industrial and commercial setting. It is loosely linked to the octane number of gasoline, since both give a measure of each substances efficacy and are inversely related. 2 diesel has a cetane number of 40 to 42, while Cenex Premium Diesel has a cetane number of 47 to 52. It is Shortly written as CN. There are four basic ways to assign a fuel a cetane number rating. Simply put, cetane is a chemical compound found naturally in diesel, and it ignites easily under pressure. Learn how and when to remove this template message, United States Environmental Protection Agency, https://en.wikipedia.org/w/index.php?title=Cetane_index&oldid=1093099575, This page was last edited on 14 June 2022, at 14:58. Cetane Number - experimental, CI - ASTM 4357 calculated from Sp Gravity, 10, 50, 90 % recovery temperature. Although the cetane number of a fuel is assumed to predict its ignition delay in any engine, the actual delay represented by the cetane number is valid only for the single cylinder engine in which it was measured. Cetane number is an inverse of octane rating of the same fuel. Buying farm fuel in bulk can be a great way to stretch your budget, especially when investing in quality premium diesel. Higher cetane levels indicate a shorter ignition delay and, as a result, improved diesel engine performance. To learn more, contact your local Cenex dealer. Cetane index is used as a substitute for the cetane number of diesel fuel. The Cetane number of a diesel fuel is a measure of the ignition properties and is an important specification that must be met during fuel production. Cetane may be a familiar name to many diesel equipment owners, but its entire meaning is unclear. How to Shrink Your Bills with Bulk Fuel Storage, Q&A: How Cenex Premium Diesel helps prevent downtime for your construction operation, Senior Product Manager, CHS Refined Fuels Marketing. The cetane index is calculated based on the fuel's density and distillation range ( ASTM D86). It is used for compression engines. It's not the case and it's not analogous to octane in gasoline. The older D976, or "two-variable equation" is outdated and should no longer be used for cetane number estimation. and midboiling-point temperature (q.v. A fuel's Cetane Number reflects it's performance in a standardized ASTM test involving a specific kind of engine. In a particular diesel engine, higher cetane fuels will have shorter ignition delay periods than lower cetane fuels. Oak Court Business Centre The sun flower oils methyl relation the Cetane number for Oils, biofuel, biodieselester has a minimum density value of 0.86 kg/l. It is the industry-standard measure for evaluating fuel combustion quality due to its extreme flammability. Understanding how your equipment works is key to running a successful operation. Your email address will not be published. $( & #39;img# closed & #39;).click(function(){$(&# 39;# bl_banner & #39;).hide(90);});});
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It also discusses the various methods of analysing the fuels performance in more detail, too. Loves to share his learnings and experiences with others. Considering making the switch to premium diesel or biodiesel for your fleet operation? Considering premium diesel for your construction equipment? In a gas engine, fuel is compressed then ignited with a spark plug. Cenex Roadmaster XL and Cenex Ruby Fieldmaster are both terminally injected with the optimal level of cetane improver as part of their multifunctional additive package. The cetane number is the most definitive way to describe the quality of the combustion process in a diesel engine. Modern highway diesel engines tend to require fuel with a cetane number ranging from 45 to 55. Considered as poor fuel (if Cetane number < 37), usual range is 30-35. In the course of the tests the time of self-ignition of fuel is compared . The cetane index is calculated based on the fuel's density and distillation range (ASTM D86). When calculating, the flammability of cetane is assumed to be 100%, and that of alpha-methyl naphthalene is 0%. The cetane index is a figure which denotes the quality of a diesel fuel, based upon its density and volatility, and which is roughly approximate to its cetane number. Read on to learn the fundamentals of cetane and how it can impact your business. Considered as poor fuel (if Cetane number < 37), usual range is 30-35. For many diesel equipment owners, cetane may be a familiar term, but its full meaning remains a mystery. calculated from the density (q.v.) In Europe, diesel cetane numbers were set at a minimum of 38 in 1994 and 40 in 2000. Cetane Number - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. Only use for light distillate diesel oils, for heavy (residual) fuel oil two other scales are used : CCAI and CII. NO CORE REQUIRED, 18 MONTH WARRANTY. BS 2869: Part 1: 1988 prescribes minimum limits of 48 for the cetane number and 46 for the cetane index. There are two methods used, ASTM D976 and D4737. When the ignition delay is long, such as when the cetane number is low, the majority of the injected fuel burns explosively. Copyright 2022 Labmate Online. These parameters include Cetane Number (CN or CETN), Cetane Index (CI or CETI), sulfur content, flash point, density, Cold Filter Plugging Point (CFPP) or boiling points (T95). A safer approach to protecting your equipment investment is to use a Premium Diesel with cetane improver already built in. Chemical Significance. Highlight matches. AL3 6PH Cetane Number experimental, CI ASTM 4357 calculated from Sp Gravity, 10, 50, 90 % recovery temperature. Think of it like octane ratings on gasoline. Causes of loss of vaccum in fresh water generator, Gudgeon Pin (Piston Pin) Types, Working, Function, Diagram, Journal Bearing Types, Lubrication, Uses, Diagrams, Lubrication in 4 four stroke engine with diagram, Causes, effects and prevention of over-run turbocharger, Stresses on moving parts of main diesel engine, Difference Between Sulzer and man B&W Engines, How Rotocap works ? Contemporary advances on converting marine plas Latest Trends in New Internal Combustion Engines. In Europe and Japan the minimum cetane number requirement is 45, and in the USA it is 40, the latter possibly being because a high proportion of their crude oil comes from Mexico and Venezuela. It is an indicator of combustion speed of Diesel Engine. Running equipment on diesel with a low cetane number can cause rough operation, loss of efficiency, excessive wear, and other issues. D4737 is the same method as ISO 4264. Find answers to common questions like regens, electronic control modules and diesel exhaust fluid. Most of the diesel fuel used in the world to drive internal combustion piston engines has a cetane number of about 51-55. Our and European standards require a cetane number of at least 51, premium diesel from some manufacturers reaches a cetane number in the range of 58 to 65 units. St Albans The higher a fuels cetane number, the quicker it ignites and that carries a variety of benefits for diesel equipment. Cetane number is measured in a single-cylinder engine, whereas cetane index is a calculated value. Rapid and precise on-line analysis of sulphur for blending operations, UK to account for 29% of Europe working gas capacity additions through 2026, Fuel Efficiency Standards Help Ease Pain at the Pump, High-precision flowmeter now certified for oil and gas custody transfer, New analysers for accurate and reliable low-TOC measurement in water, World class gas detection solutions to be showcased at ADIPEC. OEM Parts Manuals ; Sales Flyers ; Make/Model Search ; Search by Application ; Multiline Number Search ; MinnPar Catalogs. The current [when?] A diesel engine, however, doesnt have a spark plug combustion occurs through compression alone. ). - Tanakas achievements acknowledged by Japans Ministry of Economy, Trade and Industry LEARN MORE: GAS VS. DIESEL ENGINES: WHAT'S THE DIFFERENCE? The amount of cetanea clear, colourless hydrocarbon that ignites under high pressuresin a particular diesel mixture determines its cetane rating. These four benefits alone are worth the investment. Because of its high flammability, it serves as the industry-standard measure for evaluating fuel combustion quality. The cetane number is similar to the octane rating in that it is a rating assigned to a fuel to rate the quality of its combustion. It can cost more than $500,000. New PID sensor range provides more choice and better Radiometric measurement solutions for the petrochemical industry, Proven, precise and reliable trace moisture measurement for hydrogen and natural gas applications, Nano-coating tackles the issue of hydrogen permeation in pressure transmitters, NextGen Derived Cetane Analysis Enables Refineries to Save on Maintenance Operations Costs, Petro Industry News 23.4 - September 2022. Diesel engine operation is primarily related to the actual cetane number, and the cetane index is simply an estimation of the base (unadditized) cetane number. The older D976, or "two-variable equation" is outdated and should no longer be used for cetane number estimation. Diesel index = (Aniline point in 0F * API)/100 Diesel Index = (Cetane Number - 10)/0.72 Because only misted fuel is ignited and accumulation inside the engine is avoided, better fuel combustion and quick ignition results in faster vehicle starting as well as a quieter engine. Cetane number is a measure of the self-ignition quality of the fuel. When a test engine is not available for establishing this property directly and when cetane improver is not used, the Calculated Cetane Index by Four Variable Equation is useful for estimating ASTM cetane number. Peer reviewed (1) SPE Disciplines. Cetane index is used as a substitute for the cetane number of diesel fuel. Cetane number ( 16 carbon atoms ) Its for diesel engine due to composition of diesel has mostly 16 carbon atoms. The cetane number (CN) is a measure of how ignitable diesel fuels are. Your email address will not be published. Cetane rating, also known as cetane number is a measurement of the quality or performance of diesel fuel. Fig. Ehraz Ahmed It signifies the time gap between time of injection and time of ignition of a diesel. United Kingdom, T +44 (0)1727 858 840 This doesnt necessarily guarantee better efficiency, but it should indicate a quieter and more smoothly-running engine. Fuel for Thought Worry about cetane when/if you are having cold weather starting issues. Because of its high flammability, it serves as the industry-standard measure for evaluating fuel combustion quality. Higher the CN ,Better is the fuel ,shorter is the Ignition delay, and easier id the starting of combustion. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() );
Cetane number should equal or exceed cetane index, depending on the amount of additive used. The correlation assumes that all fuels will respond to the different pressure and temperature domains of the IQT and the . Based on Type of fuel: The higher number between both scales define high quality. Also useful as a cetane number check in cases where the ASTM cetane number has been determined. Save my name, email, and website in this browser for the next time I comment. Simply defined, cetane is a chemical component found in diesel that easily ignites under pressure. Diesel index = (Aniline point in 0F * API)/100. ISSN: 2776-0987 Volume 3, Issue 10 Oct. 2022 129 Since the CN or CI of synthetic diesel fuel is more than 60 units, it is of great It is, however, still required by the United States Environmental Protection Agency (EPA) as an alternative method for satisfying its aromaticity requirement for diesel fuel. standard for diesel sold in European Union, Iceland, Norway and Switzerland is set in EN 590, with a minimum cetane index of 46 and a minimum cetane number of 51. For ignitability, military diesel fuel specifications require that ignition quality in terms of cetane number (CN), derived cetane number (DCN), and calculated cetane index (CI), be >42, 42, and 43, respectively [1]. $(document).ready(function() {
Cetane index calculations can not account for cetane improver additives and therefore do not measure total cetane number for additized diesel fuels. (See Chapter 5 for more information about measuring cetane number.) Rapid and precise analysis of nickel and vanadium in How Close is the Petrochemical Industry to Circularity? Typically, regular no. The production of plastics and polymers is the result of synthesising hydrocarbon compounds extracted from refined crude or processed natural gas. A relationship between cetane number and aromaticity can only be obtained provided that the ratio of iso-paraffinic groups to normal para ffinic groups is constant for all the fuels used. The hydrocarbon cetane has the chemical formulas C 16 H 34 and CH 3 (CH 2)14CH 3.It is a linear polymer saturated alkane with the name n-hexadecane. Think of it like octane ratings on gasoline. What is temperature range and properties of Viton? High and low cetane materials The U.S. Department of Energy's Office of Scientific and Technical Information Specifically, this measure is referred to as cetane number. Working Principle and its Theory & Applications, Diesel Generator Working Principle | Parts And Functions, What are Pattern ? Determination of cetane number is based on its value equal to the percentage of cetane in the mixture thereof with alpha-methyl naphthalene in a fuel equivalent. Excerpts and links may be used, provided that full and clear credit is given to the , Introduction to Intrinsically Safe Systems, Corrosion Problems Associated with Stainless Steel, Zeron 100 Alternative Material for Severe Conditions, Basics of Hydraulic Surge or Water Hammer. Different Types of Patterns - Explanation, Flame Arrester - Introduction, Working Principle, Construction, What is Muff Coupling (Sleeve) - Design , Diagram & Working. The fuel's derived cetane number can then be calculated using an empirical inverse relationship to ignition delay. Cetane is an un-branched open chain alkane molecule that ignites very easily under compression, so it was assigned a cetane number of 100, while alpha-methyl napthalene was assigned a cetane number of 15 . KUBOTA 12 V Starter Assembly. E info@labmate-online.com. Aniline point is the lowest temperature at which the oil is completely miscible with an equal volume of aniline high aniline point indicates presence of Paraffinic components and hence better diesel index. It is determined by comparing the Ignition quality of standard solution (cetane +Alpha -methyl Naphthalene ) with Ignition quality being tested. F +44 (0)1727 840 310 Our local fuel expert shares information that will help you decide. "The cetane number of a given diesel is obtained by matching its ignition quality to a reference blend of cetane (set at 100) and isocetane (set at 15), hence the name 'cetane number.' 7.2 Within the range from 30 to 60 cetane number, the expected correlation of the Calculated Cetane Index with the ASTM cetane number will be somewhat less than 62 cetane Premium Diesel for Construction Equipment: Is It Worth the Investment? FITS KUBOTA ENGINE Z602 -EF02 USED IN MI-T-M PRESSURE WASHER MODEL HS-3006-OMDK. It can also mean that there will be less harmful emissions from the exhaust pipe (thus helping the environment), and less wear and tear on the inner components of the car such as its battery, engine and other parts, due to an increased rate of the distribution of lubricants. Gathered knowledge and experience about all the Machineries Onboard while sailing across. However, the two measurements do differ in what it is they exactly correspond to. Thus, it is a. LEARN MORE: 3 THINGS TO KNOW ABOUT AFTERMARKET ADDITIVES. Higher cetane number means this gap is less. Cetane index. standard for diesel sold in European Union, Iceland, Norway and Switzerland is set in EN 590, with a minimum cetane index of 46 and a minimum cetane number of 51. The higher the Cetane number, the shorter the delay between injection and ignition (the faster it ignites). Cetane Engine: This machine is the gold standard for setting ratings. What is a Cetane Number | Importance of Cetane Number. What is the difference between alloy 825 & alloy 625? The most common additive is 2-ethylhexyl nitrate (2EHN). Since cetane index cannot account for the presence of cetane improvers, its value is always equal to or less than the true cetane number. Think of the Index as a predictor. Alkyl nitrites and Di-tert-butyal peroxide are used as additives to raise the Cetane number. It is loosely linked to the octane number of gasoline, since both give a measure of each substance's efficacy and are inversely related. Many diesel equipment owners looking to boost their fuels cetane number turn to aftermarket additives known as cetane improvers. This Page is copyrighted. confidence level between cetane number and aromatic-ity, Figure 8. REPLACES 16853-63014. It is an inverse function of a fuels ignition delay. The scale for measuring cetane ranges from 0 to 100, and the higher the number, the better. A reduction in cetane number from 50 to 40 . (C.I engine ). A recently approved method for cetane determination using the Ignition -Quality Tester (IQT) is based on an ignition delay measurement in a combustion bomb apparatus, which is empirically correlated to cetane number. All rights reserved. The time taken from injection to ignition and combustion are measured and the cetane number is calculated from these time delays. While all lithium ion batteries are designed to deliver power to a source, not all feature the same chemistry, energy materials and technology. The trouble with these aftermarket products, though, is the amount of guesswork they involve and that makes them inherently risky. It is the percentage of cetane contained in the standard solution which has an Ignition delay equalling the Ignition delay of fuel tested. The CN measures the fuel's ignition delay. PREMIUM DIESEL. Cetane index in some crude oil assays is often referred to as Cetane calcule, while the cetane number is referred to as Cetane measure. Its just opposite of octane number. LEARN MORE: Q&A: REGULAR VS. The older D976, or "two-variable equation" is outdated and should no longer be used for cetane number estimation. . cetane number The article NextGen Derived Cetane Analysis Enables Refineries to Save on Maintenance Operations Costs talks about how improved efficacy of the fuels, due to a higher cetane index, can benefit companies in the long run. Towards the end of the production process, multiple quality parameters need to be determined before it can be sold on the market. Another method that fuel-users control quality is by using the Cetane index (CI), which is a calculated number based on the density and distillation range of the fuel. What type of reducers being used at pump suction? The Ignition quality of fuel affects both the exhaust properties and combustion noise. Understand Liquid Fueling Options for Your Fleet. The difference is that, while a good octane rating means a fuel doesnt ignite too soon, a good cetane number means a fuel ignites as soon as possible. The diesel blends were calculated and given in Table-6 and graph hasfuel sample was observed to have a density value of 0.836 been drawn between measured value and calculated valuekg/l which is lower than edible, non . There are two methods used, ASTM D976 and D4737. With a higher cetane number, the fuel ignites faster, resulting in less non-ignited fuels accumulating inside the combustion chamber and more complete fuel combustion. There are two alternative methods: 1. Thermal mass flow meters simplify hydrogen measureme Worlds widest range of SIL-rated thermal flow met Radiometric measurement solutions for the petrochemi How is Microscopy Used to Improve Energy Materials, Protecting your team from invisible dangers. Cetane Rating (Cetane Number) It is an indicator of combustion speed of Diesel Engine. The injected fuel burns more uniformly and completely, resulting in better exhaust air quality, particularly in terms of soot, particulate matter, and unburned hydrocarbons. - ION Science appoints four directors for strategic evolution and International Labmate Limited If CN increases = (shorter the time between fuel injection and rapid combustion or pressure rise), better ignition quality. D4737 is the newest method and is sometimes referred to as "the four-variable equation". Cetane index, on the other hand, is a calculation that doesn't involve putting the fuel inside an engine. The maximum attainable purity of diesel fuel is pure cetane, which has a cetane rating of 100. It takes a short but finite time for the fuel to evaporate, and heat up in the hot compressed air to the point where it will self ignite. What is the difference between Cetane Index and Cetane Number? Running equipment on diesel without a sufficient cetane number can result in rough operation, lost efficiency, excessive wear and more. Rather, it's a calculation based on a fuel's density and its distillation curve. Hertfordshire First, the Cetane number for diesel fuel describes how quickly it ignites after its injected. [Pg.358] Cetane index an approximation of the cetane number (q.v.) cetane number Feature. 2. The higher the number, the better the fuel burns within the engine of a vehicle. It is the measure of ignition quality of fuel. Enter your email address to subscribe to this blog and receive notifications of new posts by email. When it comes to maintaining equipment, fuel doesnt need to be a mystery. There are two principle ways in which cetane indexes can be improved. Feeds which give off high octane numbers generally give off low cetane index light cycle oils (LCOs), and improving the octane number of a substance will have a similarly beneficial effect on its cetane index, too. When Cetane number is higher, the ignition delay is short and the fuel having high Cetane number is considered as the Ideal fuel in the diesel engine. These parameters are still frequently . Any in SPE Disciplines (17) Journal . It determines how fast the fuel will enter combustion stage. Cetane number is an inverse function of a fuel's ignition delay, the time period between the start of ignition and the first identifiable pressure increase during combustion of the fuel. What is cetane number? Cetane number increases with increasing length of both fatty acid chain and ester groups, while it is inversely related to the number of double bonds.The cetane number of diesel fuel in the EU is regulated at 51. Fuel is injected. Cetane Number measures the ignition delay of the fuel in the diesel engine. Like octane number, higher cetane number has fewer ignition delays and thus engine operates more effectively. How the Cetane Number Analyser works The diesel blend is introduced via a fuel injector into a chamber that is heated to 600C. In This Edition There are various versions of this, depending on . Sandridge Park, Porters Wood And though cetane may not always be top of mind, ignoring it can prove costly. Cetane index is an alternative method to estimate the approximate cetane number of the fuel, from other, easy to measure properties, i.e., density and specific points of the distillation curve, and is used when the CFR engine is not available for measurement. 7.1 Correlation of index values with ASTM cetane number is dependent to a great extent upon the accuracy of determi-nation of both API gravity and midboiling point. Cetane number and cetane index relationship | Semantic Scholar It is a requirement of the European Specification for Automotive Diesel Fuel BS EN 590 that both the Cetane Number (CN) and Cetane Index (Cl) are determined and reported. In a particular diesel engine, higher cetane fuels will have shorter ignition delay periods than lower cetane fuels. And often, it can be difficult to tell between a legitimate product and harmful snake oil. For enhanced engine performance, the secret is in the cetane. Highly combustible, these chemical compounds are designed to make fuels burn more quickly. Required fields are marked *. Cetanenumber or CN is a measure of a fuel's ignition delay; the time period between the start of injection and the first identifiable pressure increase during combustion of the fuel. In Europe, diesel cetane numbers were set at a minimum of 38 in 1994 and 40 in 2000. This is because of a fundamental difference in the way gasoline- and diesel-powered engines operate. It shows the ignition delay, or the time it takes for diesel fuel to self-ignite when injected into hot air through the fuel injector. Cetane number is the measure of fuel quality of diesel engine. Cetane number from 48 to 50 is considered good for an engine. In cases where the ASTM cetane number of a fuel has been previously established, the Calculated Cetane Index by Four Variable Equation is useful as a cetane number check on subsequent batches of that fuel, provided the fuel's source and mode of manufacture remain unchanged. Premium diesel fuel can have a cetane number as high as 60. GAS VS. DIESEL ENGINES: WHAT'S THE DIFFERENCE? Abstract The Institute of Petroleum (IP) runs a monthly diesel fuel engine correlation scheme under which approximately 25 laboratories worldwide determine Cetane Number (CN). Case 580L Loader Backhoe;. All other hydrocarbons in diesel fuel are indexed to cetane as to how well they ignite under compression. Cetane index is an estimation of the cetane number made using bulk properties ( density and distillation profile) without having to employ a test engine. This article, which summarises the findings of an Energy Institute (El) sponsored Technical Development Project carried out by Cliff Lilley*, outlines a review of the suitability of the current Cetane Index equation used in . Alpha-methylnaphthalene was provided a cetane number of 0 because of its long delay time, but this has been replaced as a standard fuel by 2,3,4,5,6,7,8-heptamethylnonane, which also has a cetane number of 15. 3 THINGS TO KNOW ABOUT AFTERMARKET ADDITIVES. (adsbygoogle = window.adsbygoogle || []).push({});
. The cetane index is a figure which denotes the quality of a diesel fuel, based upon its density and volatility, and which is roughly approximate to its cetane number. As a result, they provide a quicker, more complete burn.

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