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GB/T 18255-2022 PDF in English

GB/T 18255-2022 (GB/T18255-2022, GBT 18255-2022, GBT18255-2022)
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GB/T 18255-2022: PDF in English (GBT 18255-2022)

GB/T 18255-2022
ICS 71.080
CCS G 18
Replacing GB/T 18255-2000
Method for measuring distillation range of coking viscous oil
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 4 
4 Principle ... 5 
5 Instruments and apparatuses ... 5 
6 Test procedures ... 7 
7 Temperature correction ... 8 
8 Calculation of test results ... 9 
9 Tolerances ... 10 
10 Test report ... 10 
Appendix A (Informative) Reference table of temperature correction value under
atmospheric pressure ... 11 
Method for measuring distillation range of coking viscous oil
Warning – The personnel who uses this document shall have hands-on experience
in formal laboratory work. This document does not address all possible safety
issues. It is the responsibility of the user to take appropriate safety and health
measures and to ensure compliance with the conditions which are set by the
relevant national regulations.
1 Scope
This document specifies the instruments and equipment, test procedures, temperature
correction, calculation of test results, tolerances and test report of the method for
measuring distillation range of coking viscous oil products.
This document applies to the measurement of distillation range of coking viscous oil
products such as coking washing oil, wood preservative oil, coking raw oil for carbon
black, anthracene oil, and fuel oil.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 1999, Sampling of coking oil products
GB/T 2288, Coking products - Determination of moisture content
GB/T 8170, Rules of rounding off for numerical values & expression and judgment
of limiting values
YB/T 2305, Glass thermometers for coking products
3 Terms and definitions
No terms and definitions need to be defined in this document.
t – the temperature that shall be observed after correction, in degrees Celsius (°C);
t0 – the temperature that shall be observed according to the specifications in the standard,
in degrees Celsius (°C);
t1 – the collected value of the thermometer, in degrees Celsius (°C);
t2 – pressure correction value, in degrees Celsius (°C);
t3 – the correction value of the temperature of the exposed part of the mercury column,
in degrees Celsius (°C);
tB – the temperature of the auxiliary thermometer attached to 1/2H, in degrees Celsius
H – the temperature difference corresponding to the height of the mercury column on
the exposed part of the thermometer, in degrees Celsius (°C);
p – the atmospheric pressure converted into the atmospheric pressure in the standard
state during the test, in kilopascals (kPa);
p0 – atmospheric pressure during the test, in kilopascals (kPa);
α – correction value of temperature under atmospheric pressure, in pascals (Pa) (see
Appendix A for the value of α).
7.2 When the atmospheric pressure is (101.3 ± 2.0) kPa during the test, the distillation
range temperature does not need to be corrected for atmospheric pressure.
8 Calculation of test results
8.1 The dry base quantity of distillate X (%) at each stage is calculated according to
Formula (5):
V – quantity of distillate, in milliliters or grams (mL or g);
W’ – moisture content of the distilled sample, %;
100 – Sample size, in milliliters or grams (mL or g).
8.2 Round off the calculation results according to GB/T 8170.
9 Tolerances
The repeatability of the test results shall not be greater than 1.5%.
10 Test report
The test report shall contain at least the following information:
a) information such as identification sample, laboratory and date of analysis;
b) number of this document (including the year of issue);
c) the extent of compliance with the provisions of this document;
d) analysis results and their expression;
e) abnormal phenomena observed in the measurement;
f) operations not specified in this document, or any operations that may affect the
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.