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UFC 3-460-03F
21 JANUARY 2003
STANAGNATO standardization agreement.
SumpA low area or depression that receives drainage.
ThiefSampling apparatus that gets liquid samples within 13 millimeters (0.5 inch) of the bottom of a
tank.
Type I hydrant systemSee "Panero system."
Type II hydrant systemSee "Pritchard system."
Type III hydrant systemSee "Phillips system."
Type IV refueling systemSee "Hot pit system."
Unloading headerSee "Offloading."
Upper explosive limit (UEL)Sometimes referred to as upper flammable limit.  The maximum
concentration of a flammable vapor in the air that will ignite if an ignition source is applied.
UpstreamA term used to describe direction of flow in a pipeline. Upstream is when the flow is
moving toward a component or reference point.
Valve position indicator (VPI)A valve accessory that indicates its position (open or closed).
Vapor lockMalfunction of a pumping system caused by vaporizing the fuel.
Vapor pressureInternal pressure of vapor in a liquid, usually in psi; an indication of volatility.
VenturiA tube of a smoothly shaped construction that creates differential pressure similar to an
orifice plate but much more accurately.
ViscosityMeasure of the internal resistance of a fluid to flow or movement.
VolatilityMeasure of the tendency of a liquid to vaporize (vapor pressure).
VoltageElectrical potential or potential difference.
VolumeThe amount of space occupied by a three-dimensional figure as measured in cubic units (e.g.,
inches, feet, quarts, gallons); cubic capacity.
Water draw-offA valve or similar device used to remove free water from the tank bottom.
Water slug shutoffValve in the filter/separator (F/S) discharge piping which closes automatically
when the water in the F/S rises above a set level.
WeatheringLoss of the more volatile components of a product because of evaporation.
WeatherproofElectrical enclosure used for outdoor service in nonhazardous areas.
WeightThe force with which a body is attracted toward the Earth or a celestial body by gravitation,
and is equal to the product of the mass and the local gravitational acceleration.
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