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Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels (Miniaturized Optical Method)Přeložit název
NORMA vydána dne 1.1.2021
Označení normy: ASTM D7397-21
Datum vydání normy: 1.1.2021
Kód zboží: NS-1029201
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
automatic could point, cloud point, miniaturized cloud point apparatus, Peltier, petroleum products, thermoelectric wax crystals,, ICS Number Code 75.080 (Petroleum products in general)
|Significance and Use|
5.1The 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.
5.2Petroleum blending operations require a precise measurement of the cloud point.
5.3This 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 0.1C.
5.4This 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 0.49C; however, no sample specific bias was observed.
5.5Similar 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 20W. 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 1kg and occupied the space of a small lunch box. See Section 13.
1.1This test method covers the determination of the cloud point of petroleum products and biodiesel fuels that are transparent in layers 40mm in thickness by an automatic instrument.
1.2This test method covers the range of temperatures from 60C to +20C with temperature resolution of 0.1C; however, the range of temperatures included in the 2006 interlaboratory cooperative test program only covered the temperature range of 35C to +12C. See Section 13.
1.3The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
|2. Referenced Documents|
Poslední aktualizace: 30.03.2023 (Počet položek: 2 804 399)
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