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 UFC 3-460-03F
21 JANUARY 2003
Orifice plateA component used to create a differential pressure for use in controlling automatic
valves.
Panero systemType I fuel system. Single-outlet hydrant system.
PantographA series of pipes, connected by swivel joints, used to connect fueling equipment to
aircraft or vehicles.
PetroleumA compound consisting of a mixture of hydrocarbons.
Phillips system (constant-pressure system)Type III system. Constant pressure fueling system with
multiple hydrants in the parking apron. Piping is arranged in a loop.
Pontoon roofFloating roof for a storage tank that has liquid-tight compartments with positive
buoyancy.
PowerA source or means of supplying energy. The time or rate at which work is done or energy is
transmitted or emitted.
PressureThe force exerted over a surface divided by its area.
Pressure dropThe loss in pressure of a liquid flowing through a piping system caused by pipe
friction, fittings, velocity changes, and changes in elevation.
Pressure indicating transmitter (PIT)A device used to measure pressure, convert the pressure to an
electrical signal, and send the electrical signal through a wire.
Pressure gaugeAn instrument used to measure pipeline pressure at the point where it is installed.
Some gauges can read differential pressure (DP) and some can read vacuum.
Pressure surge/spike (hydraulic shock)Sudden increase in fluid pressure caused by a sudden stop of
flow.
Pritchard systemType II fuel system. Multi-outlet hydrant system.
RefuelerTank tuck used to resupply aircraft with fuel.
movement.
SludgeHeavy viscous oily mass found in the bottom of storage tanks; often contains rust, scale, or
dirt.
Specific gravityThe ratio of the weight of a given volume of material at 15.5 C (60 F) to the weight
of an equal amount of distilled water at the same temperature, both weights being corrected for the
buoyancy of air.
StabilityProperty of product that gives it the ability to retain its physical and chemical properties
intact, even during extended storage.
Static dissipater additive (SDA)An additive that reduces static discharge potential in the vapor space
above the fuel. It reduces the time for static charges to dissipate, decreasing the potential for ignition
from static charges.
positive electrons.
StrappingMeasuring storage tanks and cargo carriers for capacity.
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