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A fluid-meter orifice plate whose edges have a circular shape and whose center coincides with the center of the pipe.



Related Terms

EXTRUSION

A process in which a hot or cold semisoft solid material, such as metal or plastic, is forced through the orifice of a die to produce a continuously formed piece in the shape of the desired product.

CENTER-GATED MOLD

A plastics injection mold with the filling orifice interconnected to the nozzle and the center of the cavity area.

WHISTLE

A sound signal emitter comprising a resonator having an orifice of suitable shape such that when a jet of air is passed through the orifice the turbulence produces a sound.

CHLADNI'S FIGURES

Figures produced by sprinkling sand or similar material on a horizontal plate and then vibrating the plate while holding it rigid at its center or along its periphery; indicate the nodal lines of vibration.

PENDULUM ANEMOMETER

A pressure-plate anemometer consisting of a plate which is free to swing about a horizontal axis in its own plane above its center of gravity; the angular deflection of the plate is a function of the wind speed; this instrument is not used for station measurements because of the false reading which results when the frequency of the wind gusts and the natural frequency of the swinging plate coincide.

PLATE GIRDER BRIDGE

A fixed bridge consisting, in its simplest form, of two flange plates welded to a web plate in the overall shape of an I.

LONGITUDINALS

Fore-and-aft structural shape or plate members attached to the underside of decks, flats, or to the inner bottom, or on the inboard side of the shell plating.

ORIFICE DISCHARGE COEFFICIENT (Cd)

The ratio of the actual flow through an orifice to that of the theoretical or isentropic flow through an orifice. Basically this parameter is a measure of the orifice efficiency. Valves are dimensionless and range from 0.61 for a thin-plate orifice to 0.85 for thick plate square-edged orifices, and up top 0.90

CHAFING PLATE

Bent plate for minimizing chafing of ropes

CENTER VERTICAL KEEL

A vertical plate on the ship's centerline between the flat keel and inner bottom extending the length of the ship. Also called center vertical keel, CVK. Or center keelson.

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