Test Methods Used to Determine the Emulsion Tendencies of Fuel

COMMON TEST METHODS USED TO DETERMINE THE EMULSION TENDENCIES OF FUEL 

Under ideal conditions, water and fuel should not emulsify. Fuel should naturally shed water and not solubilize water. However, ideal conditions do not always exist, and fuels can occasionally emulsify with water and appear cloudy or hazy. 

The terms dehazing and demulsification are often used synonymously to describe 

Low-temperature cooling limits are specified for each month of the year in the various states of the United States. Gasoline must meet these low-temperature limits for water tolerance before it can be marketed and sold. In addition to gasoline, water tolerance requirements also exist for jet fuel, diesel fuel, and heating oil. 

Unless required by ASTM, SAE, Institute of Petroleum (IP), or some other organization, refiners and marketers typically establish their own criteria for rating fuel demulsibility. ASTM D-1094 is frequently used to rate the ability of a fuel to shed water. This method is summarized by ASTM as follows  

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