Petroleum product viscosity tester

Petroleum viscosity testerOperating procedures

1. When the sample contains water or mechanical impurities, it must be dehydrated before the test and filtered through filter paper to remove mechanical impurities. For samples with high viscosity, a ceramic funnel can be used for suction filtration using a water flow pump or other vacuum pump, or dehydration filtration can be performed by heating to a temperature of 50-100 ℃. 2. Before measuring the viscosity of the sample, the viscometer must be washed with solvent oil or petroleum ether. If the viscometer is contaminated, it should be washed sequentially with chromic acid solution, water, distilled water, or 95% ethanol. Then dry it in an oven or blow dry it with hot air filtered through cotton. 3. When measuring viscosity, load the sample into a clean and dry capillary viscometer with an inner diameter that meets the requirements. Before installing the sample, place the rubber tube on the branch pipe and block the mouth of the tube with your fingers. Invert the viscometer and insert the tube into the container containing the sample. This is done by using a rubber ball to suck the liquid to the marked line b, while being careful not to create bubbles or cracks in the sample. When the liquid level reaches the marked line b, lift the viscometer from the container and quickly restore its normal state, while wiping off the sample adhered to the outer wall of the tube. 4. Immerse the viscometer containing the sample into a pre prepared constant temperature bath, and fix the viscometer on the bracket with a clamp. When fixing the position, the expanded part of the capillary viscometer must be immersed in half.

Petroleum viscosity testerExperimental steps

1. Control the oil or water bath in the thermostat at the test temperature and keep it constant at ± 0.1 ℃.
2. Select a capillary viscometer with an appropriate constant based on the viscosity range of the sample and the specified test temperature, ensuring that the flow time of the sample is within the range of 300 ± 180 ℃ seconds.
3. Wash and clean the selected capillary viscometer with gasoline or petroleum ether, and place it in an oven with a temperature not higher than 100 ℃ for drying.
4. Install the selected clean and dry capillary viscometer into the oil test. Oil with high viscosity can be heated appropriately. The method of filling oil is as follows: use a small rubber tube to cover the viscosity meter branch pipe 5, invert the viscosity meter, block the pipe mouth of pipe body B with the index finger, clamp the pipe body with the thumb and middle finger, and then insert pipe body A into a small beaker containing the test oil. Use an ear wash ball to suck the liquid from the branch pipe mouth 5 to the marking line b. When the liquid level reaches the marking line b, lift the viscosity meter from the small beaker and quickly restore its normal state. At the same time, wipe off the test oil on the outer wall of pipe end 4, and remove the rubber tube on branch pipe 5 and put it on pipe A. When filling oil, the pumping speed should be determined according to the viscosity of the test oil, and pay attention to the pipe body. 4 should be placed in the middle of the oil test to avoid the formation of bubbles or cracks in the liquid inside the pipe.
5. Immerse the viscosity meter containing the oil test into a constant temperature bath that has been heated to the specified temperature beforehand, and fix the viscosity meter on the bracket with a clamp. When fixing, the expansion part 3 of the capillary viscometer must be immersed in half. The position of the mercury ball in the thermometer must be close to the horizontal plane of the center point of capillary tube 1, and the scale of the desired temperature measurement point on the thermometer should be located about 10mm above the liquid surface of the constant temperature bath.
When the viscometer reaches the specified constant temperature time (20 minutes at 100 ℃, 15 minutes at 50 ℃, and 10 minutes at 20 ℃) in a constant temperature bath. The test temperature must be kept constant to ± 0.1 ℃. Use an ear wash ball to suck the test oil into the expansion section 2 of the viscometer tube A, so that the test oil level is slightly higher than the marking line a, and then adjust the viscometer to a vertical position.
7. Observe the flow of the test oil in tube body A. When the liquid level reaches the marked line a, start the stopwatch. When the liquid level reaches the marked line b, stop the stopwatch and record the time (s) and constant temperature of the test oil flow, accurate to 0.1 ℃. Note that there should be no bubbles in the liquid in the capillary and expansion sections throughout the entire experiment.
8. Maintain the specified constant temperature and repeat the measurement at least four times. And the difference between each flow time and its arithmetic mean shall not exceed ± 0.5% of the mean; When measuring viscosity at temperatures below -10 ℃, the difference can be appropriately increased. Then take the arithmetic mean of no less than three flow times as the average flow time of the sample.