What is significance of pour point?
The pour point, or the temperature at which a lubricant ceases to flow, is important in appraising flow properties at low temperature. As such, it can become the determining factor in selecting one lubricant from among a group with otherwise identical properties.
What is the significance of cloud and pour point?
The Pour Point Tells The Temperature Below Which Oil Cannot Be Used As Lubricant. Cloud Point Indicates The Tendency Of Oil To Plug Filters Or Small Orifices At Cold Operating Temperature. So, Cloud And Pour Point Also Tells Us The Suitability Of Lubricating Oils In Cold Condition.
What does the pour point tells about the liquid fuel?
The pour point of a crude oil, or a petroleum fraction, is the lowest temperature at which the oil will pour or flow when it is cooled, without stirring, under standard cooling conditions. Pour point represents the lowest temperature at which oil is capable of flowing under gravity.
What are factors affecting pour point and cloud point?
Since viscosity directly affects cloud and pour point, it is essential to state that the higher the density, specific gravity and viscosity of crude oil sample, the more its tendency towards reaching its cloud and pour point as shown in Fig.
What happens if pour point is high?
High pour points usually occur in crude oils that have significant paraffin content. Paraffins (or waxes) will start to precipitate as temperature decreases. At some point, the precipitates accumulate to the point where the fluid can no longer flow. This phenomenon can occur with light oils as well as heavy oils.
Is high or low pour point better?
Pour point is measured as 5F above the temperature at which a fuel ceases to flow due to the formation of wax crystals that increase its viscosity. Pour point specifications are a maximum allowable temperature. Lower pour point material is more desirable.
Which is more important pour point or cloud point?
Comparatively, cloud point is of a high value (high temperature) but, pour point is of a low value (a low temperature). Therefore, upon chilling, cloud point comes faster and pour point comes later.
What does high pour point mean?
It is defined as the minimum temperature in which the oil has the ability to pour down from a beaker. In crude oil a high pour point is generally associated with a high paraffin content, typically found in crude deriving from a larger proportion of plant material.
How the pour point of lubricating oil is increased?
While the pour point of most oils is related to the crystallization of wax, certain oils, which are essentially wax free, such as polyalphaolefins (POAs), have viscosity-limited pour points. With these oils the viscosity becomes progressively higher as the temperature is lowered until no flow can be observed.
What is pour point of lubricating oil?
The pour point describes the temperature at which the oil is still fluid and applicable under defined test conditions. Depending on the type of lubricant, the pour point lies between approx. -65 °C to -10 °C. When oil freezes, the paraffins crystallize and cross-link.
What is the significance of flash and fire point?
Flash point: It is the lowest temperature at which vapours of the material will ignite, given an ignition source. Fire point: The fire point of a fuel is the lowest temperature at which the vapour of that fuel will continue to burn for at least 5 seconds after ignition by an open flame.