Petroleum knowledge: How to detect the quality of finished oil The cheapest thing is the senses: seeing and hearing three shakes.
One look: Authentic 97# gasoline is emerald green. Some petrol refineries are light yellow or yellowish red. If red, they are leaded gasoline. If the colors are too light or even white, it is very likely that the brothers have reconciled themselves with gasoline. Authentic diesel is light yellow or white. The lighter the color, the more refined the depth and the better the stability. If you are darker than dark browns, you must be careful that it is possible that the colorimetric ratio exceeds 3.5. Black is definitely not qualified. Naphtha and kerosene are white.
Two news: smell the smell. Gasoline with MTBE added a sour taste. Appropriate additions help increase the octane number, but more than 15% oxygen content is exceeded. Too rich means adding too much, at which point the car's horsepower is reduced. Diesel smell may not be the regular factory. Naphtha has an odor that may cause corrosion failure (H2S).
Three touch: check the volatility and viscosity. It quickly evaporates on the Nails, indicating that the gasoline has passed the dry point. One or two minutes can't be completely volatilized too much to illustrate the possibility of stringing kerosene or diesel.
Four shakes: Look at viscosity and foam. It mainly depends on experience. Condensation point of the simple test: use a bottle of mineral water, a small bottle of diesel, cover strict! Ten minutes of standing in a refrigerator, taking out a 45-degree tilt, and repeatedly adjusting the temperature of the refrigerator, taking out the maximum temperature (the temperature in the refrigerator) that does not flow after one minute of tilt, is the freezing point. Note: The lid must be tightly closed, and diesel must not have gasoline. Otherwise it is easy to explode! Only a simple distinction between 0 # or 10 # diesel. The result is inaccurate. The crude oil extracted from the underground has undergone a very complicated refining process, eventually extracting fuel such as gasoline, diesel and kerosene.
In general, gasoline and diesel oils that have been processed to a certain quality standard are light yellow transparent liquids with a lower density than water. Gasoline and diesel have different odors and different touch feelings. They have a little bit of petrol, cold hands, and astringent feelings. After the gasoline evaporates, the skin is whitish. With a hand, the diesel smells oily and greasy. The correct choice of gasoline The correct choice of fuel can make the engine play its due efficiency. If the fuel is improperly used, not only will the engine not be able to generate enough power, but it will also cause damage to the engine and reduce its performance and service life. Gasoline is a highly volatile fuel that can produce ignited oil and gas even at low temperatures of -30°C. The better the volatility of gasoline is, the easier it is to vaporize, and the cold car can start and work normally in a cold environment in winter. However, gasoline with excessive volatility tends to cause air resistance at the points where gasoline pumps, oil pipelines are bent, or where the oil pipes are hot. If the volatility of gasoline is not enough, it is difficult to fully vaporize, and it is difficult for the engine to start in a low-temperature environment, and the engine cannot be fully burned, making the engine unstable, increasing the instability of the engine, increasing fuel consumption, and generating a large amount of product. carbon. Therefore, the volatility of gasoline can neither be too strong nor too bad, which is controlled during the refining of gasoline. Vehicle gasoline is distinguished by its number according to its octane number. The octane number is an indicator of the antiknock property of gasoline. It is one of the important quality indicators of gasoline. At present, there are two kinds of octane determination methods most commonly used: motor method and research method. The values ​​measured by the two methods are different. At present, the number of vehicle gasoline in China adopts the value determined by the research method. No. 93 gasoline indicates that its octane number is not less than 93#, and so on. The engine should use different grades of gasoline according to different compression ratios, which will be indicated in the manual of each vehicle. If high-compression engines use unsuitable low-grade gasoline, knocking can occur.
The correct choice of diesel fuel combustion performance is mainly represented by cetane number. The higher the cetane number, the better the combustion performance of the diesel fuel, but generally speaking the condensation point is also higher. Condensation point indicates the low-temperature fluidity of diesel oil, which is the highest temperature at which the oil begins to solidify and lose its fluidity. It is one of the important indicators of diesel oil. The mark of the diesel we use is the point of condensation. There is no direct correlation between the freezing point and the low temperature performance of diesel fuel. Because before the solidification of diesel oil, precipitated paraffin crystals, different crude oils and diesel oil obtained by different refining methods, the shape and size of these crystals are also different. They often block the filter screen of the diesel engine and cause oil supply interruption. Therefore, a car using a diesel engine should pay attention to selecting an appropriate number of oil according to the ambient temperature of the place of use. Before use, diesel should be fully precipitated and filtered to remove impurities, which should not be less than 48 hours. This is because the high-pressure diesel engine's high-pressure pump and injectors are very precise components, and they will be seriously worn out when there is a slight mechanical impurity. In addition, diesel should be preheated when used under low temperature conditions. Different grades of diesel oil, because its quality index is basically the same except for the condensation point, so it can be used in the case of seasonal oil mixed with gasoline in the plastic quality is too much, then the color is dark, orange-red, there may be very strong The odor of people. High-quality gasoline is much lighter, clearer and more transparent, and lighter in smell (not white). If oil (especially diesel) contains too much water or impurities, it looks cloudy and opaque.
One look: Authentic 97# gasoline is emerald green. Some petrol refineries are light yellow or yellowish red. If red, they are leaded gasoline. If the colors are too light or even white, it is very likely that the brothers have reconciled themselves with gasoline. Authentic diesel is light yellow or white. The lighter the color, the more refined the depth and the better the stability. If you are darker than dark browns, you must be careful that it is possible that the colorimetric ratio exceeds 3.5. Black is definitely not qualified. Naphtha and kerosene are white.
Two news: smell the smell. Gasoline with MTBE added a sour taste. Appropriate additions help increase the octane number, but more than 15% oxygen content is exceeded. Too rich means adding too much, at which point the car's horsepower is reduced. Diesel smell may not be the regular factory. Naphtha has an odor that may cause corrosion failure (H2S).
Three touch: check the volatility and viscosity. It quickly evaporates on the Nails, indicating that the gasoline has passed the dry point. One or two minutes can't be completely volatilized too much to illustrate the possibility of stringing kerosene or diesel.
Four shakes: Look at viscosity and foam. It mainly depends on experience. Condensation point of the simple test: use a bottle of mineral water, a small bottle of diesel, cover strict! Ten minutes of standing in a refrigerator, taking out a 45-degree tilt, and repeatedly adjusting the temperature of the refrigerator, taking out the maximum temperature (the temperature in the refrigerator) that does not flow after one minute of tilt, is the freezing point. Note: The lid must be tightly closed, and diesel must not have gasoline. Otherwise it is easy to explode! Only a simple distinction between 0 # or 10 # diesel. The result is inaccurate. The crude oil extracted from the underground has undergone a very complicated refining process, eventually extracting fuel such as gasoline, diesel and kerosene.
In general, gasoline and diesel oils that have been processed to a certain quality standard are light yellow transparent liquids with a lower density than water. Gasoline and diesel have different odors and different touch feelings. They have a little bit of petrol, cold hands, and astringent feelings. After the gasoline evaporates, the skin is whitish. With a hand, the diesel smells oily and greasy. The correct choice of gasoline The correct choice of fuel can make the engine play its due efficiency. If the fuel is improperly used, not only will the engine not be able to generate enough power, but it will also cause damage to the engine and reduce its performance and service life. Gasoline is a highly volatile fuel that can produce ignited oil and gas even at low temperatures of -30°C. The better the volatility of gasoline is, the easier it is to vaporize, and the cold car can start and work normally in a cold environment in winter. However, gasoline with excessive volatility tends to cause air resistance at the points where gasoline pumps, oil pipelines are bent, or where the oil pipes are hot. If the volatility of gasoline is not enough, it is difficult to fully vaporize, and it is difficult for the engine to start in a low-temperature environment, and the engine cannot be fully burned, making the engine unstable, increasing the instability of the engine, increasing fuel consumption, and generating a large amount of product. carbon. Therefore, the volatility of gasoline can neither be too strong nor too bad, which is controlled during the refining of gasoline. Vehicle gasoline is distinguished by its number according to its octane number. The octane number is an indicator of the antiknock property of gasoline. It is one of the important quality indicators of gasoline. At present, there are two kinds of octane determination methods most commonly used: motor method and research method. The values ​​measured by the two methods are different. At present, the number of vehicle gasoline in China adopts the value determined by the research method. No. 93 gasoline indicates that its octane number is not less than 93#, and so on. The engine should use different grades of gasoline according to different compression ratios, which will be indicated in the manual of each vehicle. If high-compression engines use unsuitable low-grade gasoline, knocking can occur.
The correct choice of diesel fuel combustion performance is mainly represented by cetane number. The higher the cetane number, the better the combustion performance of the diesel fuel, but generally speaking the condensation point is also higher. Condensation point indicates the low-temperature fluidity of diesel oil, which is the highest temperature at which the oil begins to solidify and lose its fluidity. It is one of the important indicators of diesel oil. The mark of the diesel we use is the point of condensation. There is no direct correlation between the freezing point and the low temperature performance of diesel fuel. Because before the solidification of diesel oil, precipitated paraffin crystals, different crude oils and diesel oil obtained by different refining methods, the shape and size of these crystals are also different. They often block the filter screen of the diesel engine and cause oil supply interruption. Therefore, a car using a diesel engine should pay attention to selecting an appropriate number of oil according to the ambient temperature of the place of use. Before use, diesel should be fully precipitated and filtered to remove impurities, which should not be less than 48 hours. This is because the high-pressure diesel engine's high-pressure pump and injectors are very precise components, and they will be seriously worn out when there is a slight mechanical impurity. In addition, diesel should be preheated when used under low temperature conditions. Different grades of diesel oil, because its quality index is basically the same except for the condensation point, so it can be used in the case of seasonal oil mixed with gasoline in the plastic quality is too much, then the color is dark, orange-red, there may be very strong The odor of people. High-quality gasoline is much lighter, clearer and more transparent, and lighter in smell (not white). If oil (especially diesel) contains too much water or impurities, it looks cloudy and opaque.
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