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UFC 3-460-03F

UFC 3-460-03F

21 JANUARY 2003

STANAGNATO standardization agreement.

SumpA low area or depression that receives drainage.

ThiefSampling apparatus that gets liquid samples within 13 millimeters (0.5 inch) of the bottom of a

tank.

Type I hydrant systemSee "Panero system."

Type II hydrant systemSee "Pritchard system."

Type III hydrant systemSee "Phillips system."

Type IV refueling systemSee "Hot pit system."

Unloading headerSee "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 lockMalfunction of a pumping system caused by vaporizing the fuel.

Vapor pressureInternal 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.

ViscosityMeasure of the internal resistance of a fluid to flow or movement.

VolatilityMeasure of the tendency of a liquid to vaporize (vapor pressure).

VoltageElectrical potential or potential difference.

VolumeThe 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 shutoffValve 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.

WeatherproofElectrical enclosure used for outdoor service in nonhazardous areas.

WeightThe 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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