ASTM D7154 Test Method for Freezing Point of Aviation Fuels (Automatic Fiber Optical 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.
NOTE 1 - This test method describes an alternative procedure and automatic apparatus which closely mimics the apparatus and procedure described in Test Method D2386.
1.2 The measuring range of the apparatus is from -70 °C to 0 °C, however the precision statements were derived only from samples with freezing point temperatures from -60 °C to -42 °C.
NOTE 2 - Typical aviation fuel has freezing point temperatures in the -60 °C to -40 °C range.
1.3 Some results from this test method (14 % of samples included in the 2003 round robin) incorrectly identified sample contamination where no contaminants were present in the samples (see research report for further information).
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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 determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 7.
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
D5901 Test Method for Freezing Point of Aviation Fuels (Automated Optical Method) (Withdrawn 2010)
D6708 Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport to Measure the Same Property of a Material
E1 Specification for ASTM Liquid-in-Glass Thermometers
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 fiber optical method, n - the robotic automation of a manual procedure and apparatus and use of fiber optics to transmit crystal detection signals to and from the specimen test chamber.
