What is the correct FSII to fuel ratio?

The mixture of FSII must be between 0.10% and 0.15% by volume for the additive to work correctly, and the FSII must be distributed evenly throughout the fuel. Simply adding FSII after the fuel has been pumped is therefore not sufficient.

What is FSII in jet fuel?

Fuel System Icing Inhibitor (FSII) acts to prevent the formation of ice crystals, providing additional security in the event of free water contamination in aviation fuel. It is a mandatory additive in many military aviation fuel specifications. FSII dissolves sparingly in fuel, but more easily in water.

What is the only FSII additive approved for turbine fuels?

Innospec’s FSII-41 ice inhibitor is based on Di-Ethylene Glycol Monomethyl Ether (DiEGME) chemistry, the preferred solution for today’s market.

At what temperature should fuels containing icing inhibitor be used?

-50 °C
This last one is crucial, since water can be often present in jet fuel and the temperature cruising altitudes can reach -50 °C, is necessary to use fuel-system icing inhibitors (FSII) as a fuel additive to reduce the risk of ice formation and prevent blocking fuel lines and filters obstructing the flow of it and …

Does Jet A contain Fsii?

Also known as JET A-1 or AVTUR. JET A-1 or AVTUR; therefore F-34 = F-35 + Additives. is a military wide cut type aviation turbine fuel with FSII used by land based military gas turbine engined aircraft (NOTE 2). Also known as JP-4 or AVTAG/FSII.

What does Fsii stand for?

A Fuel System Icing Inhibitor (FSII) is a manufactured fluid which, when added to aviation fuels, helps to prevent the formation of ice crystals in filters, fuel lines and other fuel system components. In many localities, FSII is referred to by the registered, generic trademark “Prist”, in others as “D ice”.

Does Jet A contain FSII?

What does FSII stand for?

What are common additives for Jet A fuel?

Types of jet fuel additives

• Tetra-ethyl lead. To improve the anti-knock characteristics of avgas, tetra-ethyl lead is added.
• Antioxidants (gum inhibitors)
• Metal deactivator.
• Corrosion inhibitors.
• Fuel system icing inhibitors.
• Static dissipater additives.

Why is Prist in jet fuel?

“Prist is a trade name for an aviation fuel system icing inhibitor, diethylene glycol monomethyl ether. This is an approved additive, which may be added to jet fuel—Jet A, A-1, B—to prevent free water from forming ice and potentially blocking engine filters,” Clarke said.

How heavy is jet fuel?

JP-5 is a complex mixture of hydrocarbons, containing alkanes, naphthenes, and aromatic hydrocarbons that weighs 6.8 pounds per U.S. gallon (0.81 kg/l) and has a high flash point (min. 60 °C or 140 °F).

What is F 63 fuel?

F-63 – a kerosene type diesel engine fuel. It is pro- duced on the basis of F-34 or F-35 treated with 0.1% volume of multipurpose additive S-1750. This fuel is to be used in land equipment only and must not be used for aircraft.

How is fuel system icing inhibitor ( FSII ) measured?

A measured volume of fuel, extracted with a fixed ratio of water, is tested with a suitable refractometer to determine the concentration of fuel system icing inhibitor (FSII) in fuel. Precision estimates have been determined for the DiEGME additive using specific extraction ratios with a wide variety of fuel types.

What is the correct amount of FSII for jet fuel?

FSII is an agent that is mixed with jet fuel as it is pumped into the aircraft. The mixture of FSII must be between 0.10% and 0.15% by volume for the additive to work correctly, and the FSII must be distributed evenly throughout the fuel.

Can a fuel truck turn off FSII injection?

Many FBOs allow FSII injection to be turned on or off so that one fuel truck can service planes that do require FSII as well as planes that don’t. Line crew, however, must be able to deliver FSII when it is needed.

Why does FSII dissolve in water after takeoff?

As aircraft climbs after takeoff, the temperature drops, and any dissolved water will separate out from the fuel. FSII dissolves itself in water preferentially over the jet fuel, where it then serves to depress the freezing point of water to -43 °C.