SY 7516-1992 Determination of pour point of modified crude oil by melting method SY7516-1992 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY 7516-92
Determination of Pour Point of Modified Crude Oil
Melting MethodbZxz.net
Issued on April 27, 1992
Ministry of Energy of the People's Republic of China
Implemented on October 1, 1992
Subject Content and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Determination of Pour Point of Modified Crude Oil
This standard specifies the method for determining the pour point of modified crude oil by the melting method. Melting Method
This standard is applicable to the determination of the pour point of crude oil treated by heat treatment or addition of pour point depressants. Reference Standards
GB510 Determination of Condensation Point of Oil Products
GB514 Technical Conditions for Liquid Moisture Meters for Oily Products 3 Terminology
3.1 Modified crude oil: Crude oil whose original rheological properties have been changed by heat treatment and addition of pour point depressants. $Y7516-92
3.2 Pour point of modified original: After the modified original is cooled to a certain degree of fluidity: the lowest temperature at which it can flow without heating under certain conditions is taken as the pour point of the modified original.
4 Method Overview
Pour the sample into the test tube. Insert the thermometer, cool to 10°C or -10°C, then heat at a certain speed, the temperature at which the sample liquid surface moves is the pour point of the sample.
Figure 1 Schematic diagram of pour point determination device
1- Point thermometer: 2- Cork: $- Test tube: 4- Casing: - Casing support: 6- 3000ml beaker Ministry of Resources of the People's Republic of China Approved on April 27, 1992, implemented on October 1, 1992
5 Instruments and reagents
5.1 Pour point determination device See Figure 1.
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5.1.1 Round bottom glass test arm and round bottom glass sleeve, in accordance with GB510. 5.1.2 Beaker: 3000ml, inner diameter not less than 170mm, height 200±10mm. 5.1.3 Beaker support: see Figure A1 in Appendix A, 5.1.4 Mercury thermometer: in accordance with GB514 freezing point thermometer. 5.1.5 Thermometer: -30～100°C, graduation value 1°C. 5.2 Semiconductor cold trap.
5.3 Test tube clamp.
5.4 Adjustable electric furnace.
5.5 Industrial alcohol,
Name Preparation
6.1 Start the cold trap and estimate the pour point of the sample. If the pour point of the sample is between -5 and 10°C, adjust the cold trap to -12°C; if the pour point of the sample is above 10°C, adjust the cold trap to -2°C. 6.2 Place the casing support in a 3000ml beaker and add appropriate amount of water so that the liquid is 20mm above the casing branch channel. The water temperature is about 20°C higher than the cold trap temperature.
6.3 Place the beaker on a Sichuan-adjustable electric furnace.
Determination steps
7.1 Pour the sample into the test tube to the ring mark: 7.2 Plug the test tube with a cork with a freezing point thermometer and fix the thermometer on the test tube so that the mercury ball is 8~10mm away from the bottom of the tube. Prepare two test tubes for each sample.
7.3 Determination of pour point of sample:
7.3.1 If the pour point of the sample is between -5 and 10°C, place two test tubes containing test sample and humidity in a cold trap at -12°C. When the test temperature reaches -10°C, take out the test tubes, wipe the outer wall, add the sleeve, and place them on the sleeve support. 7.3.2 If the pour point of the sample is between 10°C and 10°C, place two test tubes containing the sample and thermometer vertically in a cold trap at -2°C or ice water coolant. When the sample temperature reaches 0°C, take out the test tubes, wipe the outer wall, add the sleeve, and place them on the sleeve support. Turn on the adjustable voltage to heat the sample at a rate of 1°C/min. When the sample temperature rises to 5 to 10\C before the estimated pour point, observe the test tubes alternately every 2°C.
7.5 Keep the test tube in a vertical position and observe for 5 seconds. If the liquid level does not move, put the test tube back to its original position and continue to heat it up. If the liquid level moves (a small amount of clear liquid flowing does not constitute liquid level movement), this temperature is the pour point. 8 Determination results
The arithmetic mean of two parallel determination results is used as the pour point of the sample. 9 Precision
The following values ​​are used to judge the reliability of the results (95% confidence level): 9.1 Repeatability
The same operator, in the same laboratory, using the same instrument, following the steps specified in the method, repeats the determination of the same sample in a continuous period of time, and the difference in the results obtained should not exceed 2°C. 9.2 Reproducibility
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Different operators, in different laboratories, using the same type of instrument, following the steps specified in the method, determine the same sample, and the difference in the results obtained should not exceed 5\C.
Additional Notes:
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Appendix A
Casing Support
(Supplement)
Ratio: 1+2
This standard is proposed by China National Petroleum Corporation. Casing Support
Material Organic Glass
This standard is approved by China National Petroleum Corporation Planning and Design Institute. This standard was drafted by China National Petroleum Corporation Pipeline Science Research Institute. The drafters of this standard are Zhao Junying and Liu Wen.
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