ASTM D7153 Test Method for Freezing Point of Aviation Fuels (Automatic Laser Method)
1. Scope
1.1 This test method covers the determination of the temperature below which solid hydrocarbon crystals may form in aviation turbine fuels.
1.2 This test method is designed to cover the temperature range of -80 °C to 20 °C; however, the interlaboratory study mentioned in 12.4 has only demonstrated the test method with fuels having freezing points in the range of -60 °C to -42 °C.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This 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 and health practices and to determine the applicability of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D2386 Test Method for Freezing Point of Aviation Fuels
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
2.2 Energy Institute Standard:
IP 16 Determination Freezing Point of Aviation Fuels
3. Terminology
3.1 Definitions:
3.1.1 freezing point, n - in aviation fuels, the fuel temperature at which solid hydrocarbon crystals, formed on cooling, disappear when the temperature of the fuel is allowed to rise under specified conditions of test.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 automatic laser method, n - the procedures of automatically cooling a liquid aviation fuel specimen until solid hydrocarbon crystals appear, followed by controlled warming and recording of temperature at which hydrocarbon crystals completely redissolve into the liquid phase.
3.3 Symbols:
Cd = the specimen temperature at which the appearance of the first crystals are detected in the specimen by an optical crystal detector under specified conditions of test.
Co = the specimen temperature at which the appearance of opacity in the specimen is detected by an optical opacity detector under specified conditions of test.
Do = the specimen temperature at which the disappearance of opacity in the specimen is detected by an optical opacity detector under specified conditions of test.
