Cochin laboratory

COLD FILTER PLUGGING POINT -CFPP (P 110, D 6371, IP 309)

Cold filter plugging point is suitable for estimating the lowest temperature at which diesel fuel will give trouble-free flow in certain fuel systems. CFPP is applicable to distillate fuels including those containing a flow-improving or other additive intended for use in diesel engines and domestic heating installations.

COLD TEST/ FREEZING POINT (P 11, D 2386, IP 16, ISO 3013)

The freezing of an aviation fuel is an index of the lowest temperature of its utility for certain applications. Solid hydrocarbon crystals can restrict the flow of fuel in the fuel system of the aircraft. The temperature of the fuel in the aircraft tank normally decreases during flight depending on aircraft speed, altitude, and flight duration. The freezing point of the fuel must always be lower than the minimum operational fuel temperature also the petroleum blending operations require precise freezing point measurements.

COLOUR

Determination of the color of petroleum products is used mainly for manufacturing control purposes and is an important quality characteristic since color is readily observed by the user of the product. In some cases the color may serve as an indication of the degree of refinement of the material. When the color range of a particular product is known, a variation outside the established range may indicate possible contamination with another product. However, color is not always a reliable guide to product quality and should not be used indiscriminately in product specifications. Several color scales are used for determination: