Aviation Fuel Flashcards
Aviation fuel broadly falls into two categories?
Petrol (Gasoline) and Kerosene
What is Avgas (Gasoline fuel) used for?
It powers the reciprocating piston engine aircraft
What is aviation turbine (Avtur) fuels used for?
Powering jet and turbo prop engine aircraft
Kerosene is broken down into two types:
Avtur - (Jet A1) is the most common kerosene fuel. Avtur will not ignite under normal temperature and pressure but may do when pressured in the form of mist.
Avtag - (Jet B) is a wife cut fuel made up of 60% Gasoline and 40% Kerosine l. Used by some nava and some foreign aircraft. Avtag will readily ignite at normal temperature and pressure.
Artur (Jet A1) what is it?
Kerosene fuel
Liquid Avtur will not ignite at normal temperature.
Jet A1 will auto ignite at a 245 °C
What is a flash point
The lowest temperature at which a substance will momentarily ignite
Flash point
Flammable liquids
Highly flammable
Extremely flammable
Flammable liquids 55°C
Highly flammable 21°C
Extremely flammable 0°C
What does auto ignition temperature mean
The lowest temperature at which the vapour and air mix over a substance will spontaneously combust.
No flame or spark needed
Describe flammable range?
Is the range of combustible vapour gas/air mixture or between the upper and lower flammable limits
Describe vapour density
Is the ratio of density of gas to density of air (Air = 1)
Resulting in flammable gases being generally greater then air and sink.
Describe vapour pressure
A high vapour pressure means the substance is more volatile as it readily vaporisers
Describe boiling point
The substances vapour pressure is equal to atmospheric pressure
Limits of flammability
LEL - lower explosive limit
UEL - upper explosive limit
Ideal mixture
