GB/T 23800-2009 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 23800-2009 | English | 75 |
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Heat transfer fluids -- Determination of thermal stability
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GB/T 23800-2009: Heat transfer fluids -- Determination of thermal stability---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT23800-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 75.100
E 34
Heat transfer fluids - Determination of thermal stability
Issued on. MAY 18, 2009
Implemented on. NOVEMBER 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Summary of method... 6
5 Meaning and application... 6
6 Instruments and materials... 6
7 Test procedure... 7
8 Report... 13
Foreword
This standard modifies and uses the German national standard DIN
51528.1998 “Determination of the thermal stability of unused heat transfer fluids”
(English version).
This standard was redrafted in accordance with DIN 51528.1998.
In order to adapt to China’s national conditions, this standard made
modifications when adopting DIN 51528.1998.The main technical differences
between this standard and DIN 51528.1998 are as follows.
- CHANGE the standard name into “Heat transfer fluids - Determination of
thermal stability”;
- CHANGE the unit of temperature from K to °C;
- ADD the requirements for the accuracy of weighing of specimen and
instrument;
- INCREASE the minimum volume of glass ampoule from 5 mL to 15 mL;
- ADD the report of the appearance of the specimen after heating;
- ADD the requirements for gas chromatography analysis;
- In clause 6.1.1, ADD that “guarantee the even distribution of temperature”;
- CHANGE the test time of each specimen from not less than 480 h to not
less than 720 h.
This standard was proposed by the National Petroleum Products and
Lubricants Standardization Technical Committee (SAC/TC 280).
This standard shall be under the jurisdiction of the National Petroleum Products
and Lubricants Standardization Technical Committee, Subcommittee of
Petroleum Fuels and Lubricants (SAC/TC 280/SC 1).
Drafting organization of this standard. Petrochemical Research Institute of
China Petroleum and Chemical Corporation.
The main drafters of this standard. Kang Yin, Liang Hong, Jin Ke.
Heat transfer fluids - Determination of thermal stability
1 Scope
1.1 This standard specifies the test method for the thermal stability of unused
heat transfer fluids, including heat transfer fluids which have a maximum use
temperature above their boiling point at atmospheric pressure.
1.2 This standard does not evaluate the suitability of heat transfer fluids of
organic silicone types.
1.3 This standard is related to some hazardous substances, operations and
equipment. It is not intended to advise on all safety issues related to this.
Therefore, it shall establish appropriate safety and protective measures prior to
the use of this standard, determine the applicability of the restrictions of relevant
provisions.
2 Normative references
The provisions in following documents become the provisions of this standard
through reference in this standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this standard;
however, parties who reach an agreement based on this standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
HG/T 3115 Borosilicate glass 3.3 - Properties (HG/T 3115-1998, idt ISO
3585.1991)
SH/T 0558-1993 Standard test method for boiling range distribution of
petroleum fractions (Gas chromatography)
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Heat transfer fluids
The heat transfer fluid is a general term for organic substances which are
used as a heat transfer medium.
Note. The heat transfer fluids include all organic media which is used for the
purposes of indirect heat transfer, including heat transfer fluids, hot oils,
organic heat carrier, heating media, etc.
3.2
Thermal stability
The ability of heat transfer fluids to resist chemical decomposition at high-
temperatures.
3.3
Gaseous decomposition products
Substances whose boiling point is below room temperature under normal
pressure, such as hydrogen and methane.
3.4
Low-boiling components
The substances whose boiling range of the specimen after heating as
measured through a simulated distillation method is below the initial boiling
point of the unused heat transfer fluids.
4 Summary of method
4.1 The heat transfer fluids are heated at a predetermined temperature. The
deterioration rate of the heat transfer fluids is determined to evaluate the
thermal stability of the heat transfer fluids.
4.1.1 The unused heat transfer fluid can be sealed in a glass ampoule which is
placed in a metal protective tube, or otherwise added into a steel tester and
sealed. The metal protective tube or steel tester which is loaded with a glass
ampoule is heated to a specified time at the specified test temperature, the test
temperature is preferably within the upper limit of the temperature range in
which the product to be tested is used.
4.1.3 Compare the test results of the heat transfer fluid before and after it is
heated.
5 Meaning and application
5.1 Under the laboratory conditions as specified in this standard, this method
records and reflects the effect of heat on the heat transfer fluid as a function of
temperature and heating time.
5.2 It cannot extrapolate the information on the performance of heat transfer
fluids in industrial heat transfer devices from the test results of this method,
because the performance of heat transfer fluids in the device is also affected
by other materials, various pollutants, heat accumulation, temperature in the
circulatory systems, and so on.
6 Instruments and materials
6.1 Instrument
6.1.1 Heater. It can control the temperature within ±1 °C of the test temperature,
guarantee the even distribution of temperature. Ensure the safe storage of heat
transfer fluids.
6.1.4 Tube distiller. Type BUCHI B-580 (It may also use other models that meet
the requirements of 7.4.3).
6.1.5 Vacuum pump. The pressure can be pumped to below 10 Pa.
6.1.6 Balance. The sensitivity is 0.1 mg.
6.1.7 Dewar. It contains the mixture of acetone or isopropanol and dry ice.
6.2 Materials
6.2.1 Nitrogen. Purity (mass fraction) is above 99.99%.
6.2.2 Reference oil. Reference oil No.1 or reference oil No.2, the boiling range
distribution of which is as shown in Appendix B of SH/T 0558-1993.
7 Test procedure
7.1 Preparations of test
At room temperature, WEIGH the mass (m1) of the clean and dry glass ampoule
or steel tester, accurate to 0.1 mg. Then LOAD the specimen to approximately
half the volume of the glass ampoule or steel tester; WEIGH its mass (m2) again,
accurate to 0.1 mg.
7.2 Heating of specimen
START heating from room temperature. When the temperature rises to 50 °C
below the test temperature, CONTROL the heating rate to below 2 °C/min.
7.3 Opening tester
7.3.1 Overview
After the tester is cooled to room temperature, REMOVE it out from the heater.
Then RECORD the appearance of the specimen. FINISH the corresponding
weighing.
7.4 Analysis
7.4.1 Based on the mass difference of the glass ampoule or steel tester before
and after being opened, DETERMINE the content of the gaseous
decomposition product.
7.4.2 USE the gas chromatography of SH/T 0558-1993 to perform simulate
distillation to determine the boiling point range of the specimen before and after
heating. USE a capillary column.
7.4.3 WEIGH the mass of the hollow tail ball of the tube distiller (m5), accurate
to 0.1 mg.
7.5 Evaluation
7.5.1 Calculation of the content of gaseous decomposition product of
specimen
Use the formula (1) to calculate the mass fraction of the gaseous decomposition
product content of specimen, %.
7.5.3.2 Considering that the content of gaseous decomposition products and
the content of nonvolatile decomposition products cannot be determined by gas
8 Report
8.1 Type of heat transfer fluid;
8.2 Test time, h;
8.3 Test temperature, °C;
8.4 Appearance of the specimen after heating;
8.5 Content of gaseous decomposition products and low-boiling components
(mass fraction), %, accurate to one decimal place;
8.8 The initial and final boiling point of the specimen before and after heating, °C;
8.9 Test conditions inconsistent with this standard;
8.10 Test date.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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