Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels (Miniaturized Optical Method)

Importancia y uso:

5.1 The cloud point of petroleum products and biodiesel fuels is an index of the lowest temperature of their utility for certain applications. Wax crystals of sufficient quantity can plug filters used in some fuel systems.

5.2 Petroleum blending operations require a precise measurement of the cloud point.

5.3 This test method can determine the temperature of the test specimen at which wax crystals have formed sufficiently to be observed as a cloud with a resolution of 0.1 °C.

5.4 This test method provides results that are equivalent to Test Method D5773/IP 446. The temperature results of this test method have been found to be warmer than those of Test Method D2500/IP 219 by an average of 0.49 °C; however, no sample specific bias was observed.

5.5 Similar to Test Method D5773/IP 446, this test method determines cloud point in a shorter period of time than Test Method D2500/IP 219.

Note 1: In cases of samples with cloud points near ambient temperatures, time savings may not be realized.

Note 2: This test method eliminates most of the operator time required of Test Method D2500/IP 219.

Note 3: The only utility required by the apparatus described in this test method is electricity with power consumption of approximately 20 W. The electric power can come from an alternating current source (wall receptacle) or direct current source such as a battery or a cigarette lighter plug in a vehicle.

Note 4: The apparatus described by this test method can be made much smaller and lighter than that of Test Methods D5773/IP 446 and D2500/IP 219, allowing full portability.

Note 5: The apparatus used in the 2006 interlaboratory study weighed approximately 1 kg and occupied the space of a small lunch box. See Section 13.

Subcomité:

D02.07

Referida por:

D6751-24, D6751-24, D7467-23, D7467-23, D6751-24

Volúmen:

05.03

Número ICS:

75.080 (Petroleum products in general)

Palabras clave:

automatic could point; cloud point; miniaturized cloud point apparatus; Peltier; petroleum products; thermoelectric wax crystals;