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DL/T 1988-2019: Determination of density of sulphur hexafluoride oscilating U-tube method
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| DL/T 1988-2019 | English | 279 |
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Determination of density of sulphur hexafluoride oscilating U-tube method
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DL/T 1988-2019
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Basic data | Standard ID | DL/T 1988-2019 (DL/T1988-2019) | | Description (Translated English) | Determination of density of sulphur hexafluoride oscilating U-tube method | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F20 | | Classification of International Standard | 27.100 | | Word Count Estimation | 12,110 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB/T 6682; GB/T 8979 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the outline of the method, instruments and materials, preparations, instrument calibration, test procedures, calculations, reporting results and precision for the determination of sulfur hexafluoride gas density by the U-tube oscillation method. This standard is applicable to the determination of sulfur hexafluoride gas density, and other gases or mixed gases can be implemented by reference. | DL/T 1988-2019: Determination of density of sulphur hexafluoride oscilating U-tube method---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.
Determination of density of sulphur hexafluoride oscilating U-tube method
ICS 27.100
F 20
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
Sulfur hexafluoride gas density determination method
U-tube oscillation method
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
1 Scope...1
2 Normative references...1
3 Method summary...1
4 Apparatus and materials...1
5 Preparation...2
6 Instrument calibration...2
7 Test procedure...2
8 Calculation...3
9 Report results...4
10 Precision...4
Appendix A (informative appendix) water density table...5
Appendix B (informative appendix) density table of other commonly used gases...7
Appendix C (informative appendix) air density table...8
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation".
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the National Electrochemical Standardization Technical Committee.
The main drafting units of this standard. State Grid Fujian Electric Power Co., Ltd. Electric Power Research Institute, State Grid Anhui Electric Power Co., Ltd. Electric Power Section
Research Institute, State Grid Hunan Electric Power Co., Ltd. Electric Power Research Institute, State Grid Jiangsu Electric Power Co., Ltd. Electric Power Research Institute, Xi’an
Thermal Power Research Institute Co., Ltd.
The main drafters of this standard. Lian Hongsong, Zheng Dongsheng, Qi Jiong, Zhu Hongbin, Lai Yonghua, Gong Shangkun, Fu Zhiwei, Liu Xu, Wang Juan, Guo
Zhibin, Wei Jiaqiang, Xu Xiaoxiao, Wu Qibao, Yu Haiyong, Zhang Xiaoqin, Chen Jinxiang, Lin Yihong, Chen Minwei, Liu Huixin, Ruan Ying, Guo Yanxue,
Shi Guangyu, You Junbiao, Zhang Yuanyuan
This standard is formulated for the first time.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Center of the China Electricity Council (No. 2 Baiguang Road, Beijing)
One, 100761).
Sulfur hexafluoride gas density determination method
U-tube oscillation method
1 Scope
This standard specifies the outline of the method, instruments and materials, preparations,
Instrument calibration, test procedures, calculations, report results and precision.
This standard applies to the determination of the density of sulfur hexafluoride gas, other gases or mixed gases can be implemented by reference.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to
This document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 8979 pure nitrogen, high-purity nitrogen and ultra-pure nitrogen
3 Method summary
Pass the gas sample into the U-shaped oscillating tube with precise temperature control. The oscillation period of the tube will be caused by the change of the gas quality in the U-shaped oscillating tube.
Also changed, the density of the gas sample is calculated using the oscillation period and the U-shaped oscillation tube constant obtained by calibration.
4 Apparatus and materials
4.1 Digital density meter. It is composed of U-shaped oscillating tube, electronic excitation system, frequency counter, temperature control unit and display.
The resolution is 1×10-6g/cm3, and the temperature control accuracy is ±0.01℃;
4.2 Connecting pipe. silicone, PTFE or polyurethane pipe;
4.3 Erlenmeyer flask. 150mL, abrasive plug;
4.4 Float flow meter (with regulating valve). 100mL/min～1000mL/min;
4.5 Hygrometer. accuracy ±1%RH, accuracy ±5%RH or higher;
4.6 Precision digital pressure gauge. (0～700) kPa, accuracy ±0.05%, resolution 0.01kPa;
4.7 Precision barometric pressure gauge or built-in barometric pressure sensor. absolute pressure (0～130) kPa, accuracy ±0.05%, resolution 0.01kPa.
4.8 Pure water. it should meet the requirements of Grade 2 or higher of GB/T 6682.Before use, stop the conical flask and boil it to remove the dissolved air and cool it.
However, plug the bottle mouth with a stopper and seal it for later use. See Appendix A for the water density values at different temperatures.
4.9 High-purity nitrogen. it should meet the requirements of GB/T 8979, with a purity of not less than 99.999%, and the density in Appendix B;
4.10 Anhydrous ethanol. analytically pure;
4.11 Acetone. analytically pure.
5 Preparation
5.1 The measured environmental humidity should not be greater than 85%RH, and there should be no condensation on the surface of the U-shaped oscillating tube.
5.2 Cleaning of U-shaped oscillating tube
Rinse with water, then rinse with absolute ethanol or acetone, and then blow dry with dry air (the instrument can have a built-in drying tube).
5.3 Set the temperature of the U-shaped oscillating tube to 20.00°C.
5.4 Daily inspection. Let air in, if the difference between the air density reading and the standard value exceeds 1×10-5g/cm3, continue the inspection with pure water.
If it is still out of tolerance, find out the reason, and re-clean and dry the U-shaped oscillating tube. See Appendix C for the air density.
6 Instrument calibration
6.1 At least two standard materials are required to calibrate the U-shaped oscillating tube. The density of the standard materials should be traceable to national standards or adopt internationally recognized standards.
Numerical value.
6.2 Pass the first standard substance with low density value (usually high-purity nitrogen) into the U-shaped oscillating tube, and wait for it and the U-shaped oscillating tube to reach the setting
After the temperature is stable, record the oscillation period or density reading and the temperature of the U-shaped oscillation tube.
6.3 Inject the second standard substance (commonly used pure water) with a high density value into the U-shaped oscillating tube. There should be no bubbles in the water in the U-shaped oscillating tube.
in. After it and the U-shaped oscillating tube reach the set temperature and stabilize, record the oscillation period or density reading and the temperature of the U-shaped oscillating tube.
6.4 Use the detected oscillation period value of high-purity nitrogen and pure water to calculate the U-shaped oscillation tube constant F. The calculation formula is shown in (1).
6.5 If the instrument has the function of automatically calculating the density from the constant F and the oscillation period T value measured by the sample, follow the calibration of the instrument manufacturer
The normal procedure requires the input of the density values of the two standard materials into the instrument, and then the two standard materials for calibration and automatic calculation.
6.6 After calibration, clean and dry the U-shaped oscillating tube according to the steps given in 5.2.
7 Test procedure
7.1 Turn the sulfur hexafluoride gas cylinder upside down, and use the connecting pipe to connect the two ends of the gas inlet and outlet of the float flowmeter to the gas cylinder pressure reducing valve or the sampling of electrical equipment.
The valve and the inlet of the instrument are connected, and the gas outlet of the instrument is connected to a pipe with a diameter of not more than 6mm and a length of not less than 2m to the downwind or
The inlet of sulfur hexafluoride tail gas recovery unit. If you need to perform a pressure test, you can connect a precise number to T on the gas outlet pipe of the instrument as shown in Figure 1.
The pressure gauge monitors the test gas pressure inside the U-tube.
7.2 Open the SF6 gas cylinder pressure reducing valve or equipment sampling valve, adjust the gas flow rate to about 1000mL/min, and purge with SF6 gas
After 3min～5min of U-shaped oscillating tube and test pipeline, close the float flowmeter regulating valve. When testing under pressure, the outlet pipe of the instrument in Figure 1 should be closed
Note that the injection pressure of the glass U-shaped oscillating tube should not exceed 1.0 MPa.
7.3 Start the test function of the instrument. After the sulfur hexafluoride sample gas and U-shaped oscillating tube reach the set temperature and stabilize, record the oscillation period or density.
Degree readings and the temperature of the U-shaped oscillating tube, the absolute pressure value of the ambient atmosphere or the test gas pressure value in the U-shaped tube. Each test, from off to float
The time from the start of the sub-flowmeter regulating valve to the end of the test should not exceed 5 minutes.
7.4 Clean and dry the U-shaped shaking tube according to the steps given in 5.2.
8 Calculation
8.1 If the instrument has the function of automatically calculating the density from the constant F and the oscillation period T value measured by the sample, when the density displayed by the density meter is read
If the fluctuation does not exceed 1×10-6g/cm3 within 15s, record the displayed density value and the temperature of the U-shaped oscillating tube (accurate to 0.01℃).
8.2 If the density meter displays the oscillation period, calculate the density of the sample according to formula (2).
8.3 According to formula (3), convert the density value to the density under the standard state of 20℃ and 101.325kPa.
9 report results
9.1 Parallel test twice, take the average of the parallel test results as the report result.
9.2 The result of the density report must include the test temperature and unit, and ambient atmospheric pressure.
9.3 The report result of density shall retain four significant figures.
10 Precision
10.1 Repeatability
At the 95% confidence level, the same operator in the same laboratory, the same instrument and material, the two measurement results of the same sample
The difference between fruits should not be greater than 6×10-6g/cm3.
10.2 Reproducibility
At the 95% confidence level, the difference between the two measurement results of the same sample by two laboratories should not be greater than 1.6×10-5g/cm3.
Appendix A
(Informative appendix)
Water density table
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