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GB/T 386-2021: Standard test method for cetane number of diesel fuel oil
Status: Valid GB/T 386: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 386-2021 | English | 609 |
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Standard test method for cetane number of diesel fuel oil
| Valid |
GB/T 386-2021
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| GB/T 386-2010 | English | RFQ |
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Standard test method for cetane number of diesel fuel oil
| Obsolete |
GB/T 386-2010
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| GB/T 386-1991 | English | 439 |
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Diesel fuels determination of ignition quality by the cetane method
| Obsolete |
GB/T 386-1991
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PDF similar to GB/T 386-2021
Standard similar to GB/T 386-2021 GB 1787 GB 252 GB 438 GB/T 382 GB/T 258 Basic data | Standard ID | GB/T 386-2021 (GB/T386-2021) | | Description (Translated English) | Standard test method for cetane number of diesel fuel oil | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E31 | | Word Count Estimation | 33,377 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 386-2021: Standard test method for cetane number of diesel fuel oil---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Standard test method for cetane number of diesel fuel oil
ICS 75.160.20
CCSE31
National Standards of People's Republic of China
Replace GB/T 386-2010
Determination of Cetane Number of Diesel Fuel
Released on 2021-10-11
2022-05-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Abbreviations 3
5 Principle 3
6 Disturbing factors 4
7 Instruments and equipment 4
8 Reagents and materials 6
9 sample 8
10 Working conditions and standard operating conditions of engines and instruments 8
11 Calibration and engine verification 11
12 Test procedure 12
13 Calculation of Cetane Number 14
14 Results report 15
15 Precision and Bias 15
Appendix A (Informative) Safety Warning 17
Appendix B (informative) Instruments and procedures for preparing standard fuels by volume ratio 18
Appendix C (informative) Physical and chemical properties of some standard fuels 21
Appendix D (informative) Testing the physical and chemical properties of fuel 22
Appendix E (Normative) Instrument Assembly and Installation Instructions 23
Appendix F (informative) Operational technical parameter adjustment 25
References 29
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document replaces GB/T 386-2010 "Determination of Diesel Cetane Number". Compared with GB/T 386-2010, except for structural adjustment and compilation
In addition to the editorial changes, the main technical changes are as follows.
a) The term "quality control sample" has been added (see 3.6);
b) Amend the term "fire lag time table" to "cetane number table". Added the name and initial use of previous cetane number tables
A description of the number of years (see 3.7, 3.2.1 of the.2010 edition);
c) Added the low cetane component pentamethylheptane as a substitute for heptamethylnonane (see 3.14);
d) "The difference between the cetane number of the two standard fuels is not more than 5.5 units" is changed to "the cetane number of the two standard fuels is not much different."
At 5.6 units" (see 5.2, 4.2 of the.2010 edition);
e) Change the standard fuel "density value at 15.56°C" to "density value at 20°C" (see 7.3.2,.2010 edition 6.3.2);
f) Added Table 2 positive standard fuel technical indicators (see 8.3), Table 3 secondary standard fuel technical indicators (see 8.4) and Table 4 test fuels
Technical indicators (see 8.5);
g) The calculation formula for the cetane number of the mixture of pentamethylheptane and n-hexadecane has been added (see 8.3.3);
h) The requirement for positive standard fuel storage conditions has been added (see 8.3.4);
i) The cetane numbers of T fuel and U fuel were revised to 73~76 and 19~22 respectively (see 8.4.1, 8.4.2, 7.4.1 of the.2010 edition)
7.4.2);
j) Amend "15°C above the cloud point of the fuel" to "14°C above the cloud point of the fuel" (see 8.4.3, 7.4.4 in the.2010 edition);
k) Added sub-standard fuel matching requirements (see 8.4.4);
l) Amend "Sample to be placed for at least a few hours" to "Sample to be placed for at least 2h" (see 9.2, 8.2 of the.2010 edition);
m) The requirements for the minimum temperature of the diesel fuel sample before measurement and filtration are clearly specified (see 9.2);
n) Deleted the description of valve clearance during shutdown and cold state (see 10.3.6, 9.3.6.1 of the.2010 edition);
o) Added content about optimizing gap settings for specific sensors (see 10.3.25);
p) Added related content about correcting engine conditions (see 11.2);
q) Added quality control and quality control tests (see 11.4);
r) Added the preparation method and requirements of the secondary standard fuel for the determination of high cetane number samples (see 12.8, 12.9);
s) Added the requirement that the difference between the cetane number corresponding to two consecutive sets of handwheel readings is not more than 1.4 units (see 12.10);
t) Added the handwheel reading determination sequence diagram of fuel in Figure 3 and Figure 4 (see 12.10);
u) The calculation method of the cetane number of samples whose cetane number is higher than the approved reference value of T fuel has been added (see 13.2.2);
v) Added the content of reporting standard fuels (see 14.2);
w) The description of the measurement deviation between the cetane number control board and the double-reading cetane number table has been added (see 15.2.2).
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed and managed by the National Petroleum Products and Lubricants Standardization Technical Committee (SAC/TC280).
This document was drafted by. China Petroleum & Chemical Corporation Research Institute of Petrochemical Industry.
The main drafters of this document. Wang Li and Xu Feng.
The previous releases of this document and the documents it replaced are as follows.
---GB 386-1964, GB/T 386-1991, GB/T 386-2010;
---This is the third revision.
Introduction
The cetane number is a measure of the ignition properties of diesel in a compression ignition engine. It is carried out at a constant speed in a compression ignition test engine.
Determination. Cetane number is widely used in the petrochemical industry, refineries, distributors, and engine production plants, as a fuel and engine corresponding
The main indicators are measured.
The correlation between the performance of the test engine and the engine with full scale, variable speed, and variable load is not yet fully understood. This file is available
It is used for the quantitative determination of cetane number of unconventional fuels, such as synthetic fuels, vegetable oils and similar products. When measuring unconventional fuels,
The relevance of the nature of this oil in the engine is not fully understood.
Determination of Cetane Number of Diesel Fuel
Warning---Personnel using this document should have practical experience in formal laboratory work. The use of this document may involve certain dangerous
This document does not point out all safety issues. The user is responsible for taking appropriate safety, health and environmental protection measures
And ensure compliance with the conditions stipulated by relevant national laws and regulations. See Appendix A for the content of safety warnings.
1 Scope
This document describes the test method for determining the cetane number of diesel fuel with a cetane number tester. The sample is under specific operating conditions by a
The standard single-cylinder, four-stroke, variable compression ratio, intermittent injection diesel engine was tested.
This document is applicable to the quantitative determination of the cetane number of compression ignition engine fuel. The cetane number ranges from 0 to 100, but a typical test
The range is 30~65.
This document is also applicable to the quantitative determination of cetane number of unconventional fuels, such as synthetic fuels, vegetable oils and similar products.
Note. This document adopts the [SI] International System of Units, with English units in parentheses as a reference.
2 Normative references
The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document. For undated reference documents, the latest version (including all amendments) applies to
This document.
GB/T 265 Petroleum products kinematic viscosity determination method and dynamic viscosity calculation method
GB/T 4756 Manual sampling method for petroleum liquids
GB/T 6682-2008 Analytical laboratory water specifications and test methods
GB/T 6986 Determination of Cloud Point of Petroleum Products
GB/T 27867 Petroleum liquid pipeline automatic sampling method
SH/T 0176 Jet fuel peroxide value determination method
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Acceptedreferencevalue
The negotiated standard value used for comparison, which comes from.
a) Theoretical or determined value based on scientific principles;
b) Designated value or certified value based on the test work of a certain country or international organization;
c) According to a recognized value agreed upon by a scientific or engineering organization in a collaborative experiment;
d) When a) b) c) cannot be obtained, the average value of the measurement population is used.
Note. The recognized reference value for the cetane number is understood to be the cetane number of a specific reference material measured under reproducibility conditions.
[Source. GB/T 4016-2019, 2.40.041, with modification]
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