ASTM D6986 Standard Test Method for Free Water, Particulate and Other Contamination in Aviation Fuels (Visual Inspection Procedures)
1. Scope
1.1 This test method covers two procedures for establishing the presence of suspended free water, solid particulate, and other contaminants in aviation gasoline and aviation turbine fuels.
1.1.1 Both procedures are intended primarily for use as field tests with the fuel at handling temperature.
1.1.2 Procedure A uses transparent sample containers; Procedure B uses opaque containers.
1.2 Both procedures are rapid methods for contamination detection and include ratings of haze appearance and particulate presence.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
2. Referenced Documents
2.1 ASTM Standards:
D2276 Test Method for Particulate Contaminant in Aviation Fuel by Line Sampling
D3240 Test Method for Undissolved Water In Aviation Turbine Fuels
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4176 Test Method for Free Water and Particulate Contamination in Distillate Fuels (Visual Inspection Procedures)
D5452 Test Method for Particulate Contamination in Aviation Fuels by Laboratory Filtration
2.2 ASTM Adjuncts:
ADJD417601 Distillate Fuel Bar Chart
ADJD417602 Distillate Fuel Haze Rating Standard
3. Terminology
3.1 Definitions ofTerms Specific to This Standard:
3.1.1 aviation fuels - as used in this standard, the term includes both aviation gasoline and aviation turbine fuels.
3.1.2 clear and bright - a condition in which the fuel contains no visible water drops or particulates and is free of haze or cloudiness.
3.1.3 free water - water in excess to that soluble in the fuel at the temperature of the test and may appear in the fuel as a haze, cloudiness, droplets, or water layer.
3.1.4 solid particulates - small solid or semi-solid particles, sometimes referred to as silt or sediment, present in a fuel as the result of contamination by airborne dusts, corrosion by-products, or wear products.
