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 UFC 3-460-03F
21 JANUARY 2003
falls with the liquid level.
Floating panA floating cover, usually of honeycomb design, which lays directly on the fuel in a
petroleum storage tank used to reduce vapor emissions and provide fire protection. Older pans
supported above the fuel using pontoons are not effective for fire prevention.
FluidA substance tending to flow or conform to the shape of a container. Fluid can be in a liquid or
gaseous state.
Free waterUndissolved water content in fuel.
Freeze pointThe temperature at which wax crystals form in distillate fuels and jet fuels.
Fuels control center (FCC)POL control center, usually manned twenty-four hours a day, 365 days a
year.
GalvanizingZinc coating applied to iron or steel that cathodically protects it.
GasA fluid that has no particular shape or volume but tends to expand indefinitely. Will take the
shape of the container it is in and can be compressed.
GasolineA volatile liquid hydrocarbon fuel generally made from petroleum.
or piece of equipment and the earth. This is done by connecting the equipment by wire to a ground rod.
Ground rodA rod, typically 19 millimeters by 2.4 meters (0.75 inch by 8 feet), made of galvanized
steel, and driven into the earth for grounding. Copper ground rods are not typically used around
cathodic protection systems.
Hazardous atmosphereAn atmosphere presenting a potential for death, disablement, injury, or acute
illness from one or more of the following: flammable gas, vapor, or mist in excess of 10% of its LEL or
lower flammable limit (LFL); atmospheric oxygen concentration below 19.5% or above 23.5%; an
atmospheric concentration of any chemical substance greater than the occupational exposure limit
(OEL), which is capable of causing death, incapacitation, impairment of ability to self-rescue, injury, or
acute illness due to health affects.
HeaderA term describing a loading/offloading connection or coupler.
Hot pitAn aircraft direct fueling system where aircraft can be refueled while engines are still running
(Type IV).
Hydrant servicing vehicle - R-12Vehicle used with a Type III hydrant system to refuel aircraft.
Hydrant systemDistribution and dispensing system for aviation fuels, consisting of a series of fixed-
flush-type outlets or hydrants connected by piping.
Hydraulic fluidFluids intended for use in hydraulic systems. Low viscosity, low rate of change of
viscosity with temperature, and low pour point are desirable characteristics.
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