SY/T 0541-1994 Determination of the freezing point of crude oilSY/T0541-1994 Standard download decompression password: www.bzxz.net

Petroleum and Natural Gas Industry Standard of the People's Republic of China SY/T 0541-94www.bzxz.net
Determination of Pour Point of Crude Oil
1994-12-21 Issued
China National Petroleum Corporation
1995-06-01 Implementation
1 Subject Content and Scope of Application
Petroleum and Natural Gas Industry Standard of the People's Republic of China Determination of Pour Point of Crude Oil
Standard Period of the Standard Method for Determination of Pour Point of Crude Oil This standard is applicable to crude oil with a water content not exceeding 0.5% 2 Reference Standards
GB/TS10 Determination of Pour Point of Shishan Products
GB514 Technical Parts of Liquid Thermometers for Testing Petroleum Products 3 Summary of Method
SY/T 0541- 94
Put the preheated oil sample into the test tube, cool the sample at a cooling rate of 0.5-1℃/min until it is 8℃ higher than the expected freezing point, observe the fluidity of the sample every 2 seconds, and then put the test tube horizontally under the cover. The highest temperature when the sample does not flow before 5s is the freezing point. 4 Instruments and Materials
4.1 Round bottom glass test tube and round bottom glass sleeve: meet the specifications of GB/510, and engrave a ring color mark on the outer wall of the 503mm bottom of the test tube as the boundary of the oil filling amount. 4.2 Mercury thermometer: meet the provisions of GB514 freezing point thermometer: overflow range -30~60. Graduation value 1℃. 4.3 Through the thermometer 30~100, graduation
4.4 The first cooling bath or multiple cooling baths: can contain coolant and cool the sample while maintaining the set temperature. If a refrigeration device is used, the cooling speed should be controlled within the range of 0.5 to 1 min. 4.5 Cooling liquid: When the cooling liquid temperature is above 0%, water (2000g), salt and crushed ice can be used; when the cooling liquid temperature is below -20℃, alcohol and dry ice can be used.
4.6 Constant temperature water bath.
7 Bracket: Used to fix the cannula and can insert the esophagus into the cooling liquid 4.8 Bottle: 100ml
5 Preparation
5.1 Preheat the oil sample: Place a bottle containing the sample in a constant temperature water bath, and heat the oil sample neck to 50!1. Preheat the sample according to the requirements. When the required preheating temperature is higher than the required preheating temperature, the oil sample should be heated to the preheating temperature in low temperature water: Connect the cooling water and let the oil sample stand and cool to 5011. Under certain conditions, the oil sample can be preheated without adjusting the freezing point thermometer position: Insert the cork of the thermometer into the test 5.3 Preheating test tube: Heat 2 to 4 dry and clean test tubes to 50±1℃. If the preheating temperature of the oil sample is lower than 50℃, the preheating temperature of the test tube should be the same as that of the lubricating sample. If the sample is taken on site or indoors and then tested, the test tube should be preheated to the sampling temperature. 5.4 Prepare cooling liquid: Depending on the temperature of the test tube, prepare one or more cooling steps. The cooling liquid temperature of the first cooling step is 100℃. Approved by China National Petroleum Corporation on December 21, 1994 and implemented on June 11, 1995. SY/T 054194
25!2, or the temperature of the cooling bath is gradually reduced at each level. 15. Control the cooling rate of the sample to 0.5~1min5.5 Install the pre-installed cooling bath in the casing. The depth of the cooling liquid in the casing should not be less than 10:11m6 Test steps
6.1 Pour the oil sample into 2-4 test tubes to the circular mark, quickly insert the plug with the condensation point thermometer into the test tube, and make the temperature reach the center of the test tube.
G.2 Quickly and steadily put the test tube containing the sample into the casing in the cooling zone: let it stand and cool. At this time, the temperature difference between the sample and the coolant is between 10→25℃,
The temperature difference between the sample and the coolant is less than 10℃, and the sample still condenses, then The test tube should be transferred to the next cooling bath. When transferring the test tube, it should be transferred together with the sleeve as a whole, avoiding movement. 6.3 Observation method: When the temperature of the sample has dropped to 8 degrees higher than the expected freezing point, immediately remove the test tube from the sleeve and tilt it slightly, and observe whether the liquid surface shows any signs of movement. If the liquid surface moves, place the test tube back into the sleeve smoothly and quickly to continue cooling. The time for taking it out and putting it back into the sleeve should not exceed 3 seconds. After that, observe it every time the oil temperature drops by 2°C until there is no sign of movement of the liquid surface. Immediately place the test tube horizontally at 55°C. If the liquid surface does not move within 5 seconds, record the degree as the freezing point of the sample. If there is still any sign of movement of the liquid surface within 5 seconds, then the test tube should be smoothly and quickly returned to the sleeve, and after the temperature drops by another 1 or 2°C, take out the test tube and place it horizontally for 5 seconds. If the liquid surface has stopped moving, the temperature is the freezing point. Otherwise, the oil sample should be changed and the test should be repeated according to the provisions of Chapter 5 and Chapter 6, but the expected freezing point should be reduced by 47%. Precision
7.1 Repeatability
The same operator, in the same laboratory, using the same equipment, repeats the test on the same sample in a continuous period of time according to the steps specified in the method. The difference between the two results shall not exceed 8 Report
Report the freezing point of the oil sample as the arithmetic mean of the results of the two repeated measurements, and indicate the preheating temperature or special conditions. Additional remarks:
This standard was issued by China National Petroleum Corporation Planning and Design General Office Huaishan Shishan University (East China) was responsible for drafting this standard, and the main drafters of this standard were Luo Zheming, Li Chuan, and Han Mingxiu.
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