Pour point is the lowest temperature at which oil will continue to flow when its cooled under standardized prescribed condition. After preliminary heating, the sample is cooled at specified rate and examined at intervals of 3 degreeÂ C for flow characteristics.
This test measured the lowest temperature from oil, corrected to a barometric pressure of 101,3 kPa, at which application of test causes the vapour of a test portion to ignite under specified condition of test. The result of this test can indicate the presence of contaminant.
The oil to be tested, through which a stream of oxygen is bubbled, is maintained for a carefully measured period at a temperature of 100Â degree C in the presence of metallic cooper. The degree of oxidation is estimated by determining theÂ amount of sludge and the neutralization value.
Sediment is any substance which is insoluble after dilution of the oil with organic solvent (n-heptane). Precipitable sludge is oil deterioration products or contaminants. Sediment and sludge are insoluble after dilution of the oil with organic solvent (n-heptane) under prescribed conditions. Both sediment and sludge insoluble in the solvent mixture (alcohol, toluene and acetone)
This test method covers the visual determination of the color and appearance of a wide variety of petroleum products.Color and Appearance shall be evaluated by examining a representative sample of the oil in transmitted light under a thickness of approximately 10 cm and at ambient temperature. The result indicated the sediment by visual.