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![]() UFC 3-460-03F
21 JANUARY 2003
STANAGNATO standardization agreement.
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.
UpstreamA 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.
VenturiA tube of a smoothly shaped construction that creates differential pressure similar to an
orifice plate but much more accurately.
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-offA 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.
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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