ASTM D8073-16 (R2021) pdf free download.Standard Test Method for Determination of Water Separation Characteristics of Aviation Turbine Fuel by Small Scale Water Separation Instrument.
1.1 This test method covers a procedure to rate the ability of aviation turbine fuels to release entrained and emulsified water when passed through a water-coalescing filter.
1.2 Results are expressed as a Water Separation Index (WSI).
1.3 The values stated in SI units are to be regarded as standard.
1.3. 1 Exception—Units in WSI arc included.
1.4 This standard does not puiport to address all of (lie safety concerns, if any, associated with its use. it is the responsibili of the user of this standard to establish appropriate safetv health, and environme,ital practices and determine (lie applicability of regulatory limitations prior to use.
1 .5 This international standard was developed in accordance will, in te rnationallv recognized principles on standard— iatioii e.aahlished in the Decision on Principles for the Development of International Standards, Guides timid Recoinmnendations issued by the World Trade Om:c’anization Technical Barriers to Trade (TBT) Coimimnitree.
2. Referenced I)ocurnents
2. 1 A STM Standa rds. — D1655 Specification for Avialion Turbine Fuels
D2550 Method of Test for Water Separation Characteristics of Aviation Turbine Fuels (Withdrawn l989)
D3602 Test Method for Water Separation Characteristics of Aviation Turbine Fuels (Withdrawn 1994)
3. Terminology
3. 1 Definitions:
3. 1. 1 surfactant, n—in petroleum fuels. surface active material (or surface active agent) that could disarm (deactivate) filter separator (coalescing) elements so that free water is not removed from the fuel in actual service.
3.1.1.1 Discussion—Technically. surfactants affect the inter- facial tension between water and fuel, which affects the tendency of water to coalesce into droplets.
3.2 Definitions of Terms Specific to This Standard:
3.2. 1 sonicator, n—a device that applies ultrasonic sound energy to the test specimen.
3.2.1.1 Discussion—The sonicator is used to emulsify the water and aviation fuel.
3.2.2 water separation index (WSI), n—a numerical rating indicating the ease of separating water from fuel by coalescence.
3.2.2.1 Discussion—A high WSI indicates a fuel that separates water easily and is relatively free from surfactants.
4. Summary of Test SIethod
4.1 A fixed volume of test specimen is poured into the test beaker. The apparatus is purged with the test specimen. A precise amount of water containing a specific dye is added to the test beaker. The test specimen and dyed water are emulsified using a sonicator. ASTM D8073 pdf download.