SAE AIR 790C:2006-08-24

Ice formation in aircraft fuel systems results from the presence of dissolved and undissolved water in the fuel. Dissolved water or water in solution with hydrocarbon fuels constitutes a relatively small part of the total water potential in a particular system with the quantity dissolved being primarily dependent on the fuel temperature and the water solubility characteristics of the fuel. One condition of undissolved water is entrained water such as water particles suspended in the fuel as a result of mechanical agitation of free water or conversion of dissolved water through temperature reduction. Another condition of undissolved water is free water which may be introduced as a result of refueling or the settling of entrained water which collects at the bottom of a fuel tank in easily detectable quantities separated by a continuous interface from the fuel above. Water may also be introduced as a result of condensation from air entering a fuel tank through the vent system.

Author	SAE
Editor	SAE
Document type	Standard
Format	File
ICS	49.050 : Aerospace engines and propulsion systems
Number of pages	10
Replace	SAE AIR 790B:1999-10-01
Set	AEROPAKS10U-10
Year	2006
Document history	SAE AIR 790B:1999-10-01
Country	USA
Keyword	SAE 790;SAE AIR790C;SAE AIR790C;SAE AIR 790