ASTM D6811 Standard Test Method for Measurement of Thermal Stability of Aviation Turbine Fuels under Turbulent Flow Conditions (HiReTS Method)
1. Scope
1.1 This test method covers a laboratory thermal process, using a specified apparatus for measuring the tendencies of aviation turbine fuels to deposit insoluble materials and decomposition products, such as lacquers, within a fuel system. This test method provides a quantitative result for fuel under turbulent flow conditions in 65 or 125 min.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 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.
2. Referenced Documents
2.1 ASTM Standards:
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
D4306 Practice for Aviation Fuel Sample Containers for Tests Affected by Trace Contamination
E 128 Test Method for Maximum Pore Diameter and Permeability of Rigid Porous Filters for Laboratory Use
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 capillary tube, n - a coated resistively heated stainless steel tube through which fuel is pumped and controlled to give a predefined constant fuel exit temperature.
3.1.2 deposits, n - oxidative products, such as lacquers, laid down predominantly at the fuel exit end (hottest), on the inside of the heated capillary tube.
3.1.3 HiReTS, n - high Reynolds number thermal stability.
3.1.4 HiReTS Peak (P) number and Total (T) number, n - the quantitative results of the test.
3.1.5 tubeways, n - plastic and metal tubes through which fuel flows during cleaning and the test.
