What is the pour point?
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I am working on a project, and in its preliminary design, among the characteristic parameters of crude oil, there is a concept called \"pour point\". Does anyone know what it exactly means? What is the difference between it and the flash point? Thank you first
The pour point refers to the lowest temperature at which a sample of oil can still flow under specified test conditions when cooled. The freezing point refers to the highest temperature at which, under specified test conditions, the surface of the cooled oil sample stops moving, and it is expressed in °C. It is a standard indicator used to measure the low-temperature flowability of lubricants. The pour point of the oil is usually a few degrees higher than its freezing point; in the past the freezing point was commonly used, but nowadays the pour point is the internationally accepted standard. A high pour point or freezing point means that the oil has poor flowability at low temperatures. Based on the pour point of oils, people can determine the measures that should be taken for transportation, storage, and receipt/dispatch in low-temperature conditions, and it can also be used to evaluate the low-temperature performance of certain oils. However, when evaluating the low-temperature performance of multipolar internal combustion engine oils and vehicle gear oils, low-temperature dynamic viscosity, boundary pumping temperature, and pour point should be used as the main parameters. http://baike.baidu.com/view/588783.htm
The flash point is the lowest temperature at which a flammable liquid or solid can release enough vapor to form a flammable mixture with air at the surface of the liquid or solid within its container. It is an important physicochemical property related to safety; substances with a flash point below 60 degrees are considered hazardous chemicals. Flash point analysis instruments also distinguish between open-cup flash point and closed-cup flash point. The pour point refers to the lowest temperature at which an oil sample can still flow under specified testing conditions; it is used to measure the low-temperature fluidity of lubricants, and can be determined using a pour/flash point tester.
The lowest temperature at which the oil sample can flow under specified test conditions when cooled. In other words, lubricants cannot flow when their pour point is reached.
So, the pour point is closely related to the viscosity of the oil! ! !
The pour point refers to the lowest temperature at which a sample of oil can still flow under specified test conditions when cooled. The freezing point refers to the highest temperature at which, under specified test conditions, the surface of the cooled oil sample stops moving, and it is expressed in °C. It is a standard indicator used to measure the low-temperature flowability of lubricants. The pour point of the oil is usually a few degrees higher than its freezing point; in the past the freezing point was commonly used, but nowadays the pour point is the internationally accepted standard.