The determination of the quantity of a fluid, either a liquid, a vapor, or a gas, that passes through a pipe, duct, or open channel.


Related Terms

PLUG VALVE

A valve fitted with a plug that has a hole through which fluid flows and that is rotatable through 90 for operation in the open or closed position. Also known as plug cock.

PIVOT BRIDGE

A bridge in which a span can open by pivoting about a vertical axis.

PITOT TUBE

An instrument that measures the stagnation pressure of a flowing fluid, consisting of an open tube pointing into the fluid and connected to a pressure-indicating device. Also known as impact tube.

PHOTOELECTRIC DOOR OPENER

A control system that employs a photocell or other photo device, used to open and close a poweroperated door.

PARSHALL FLUME

A calibrated device for measuring the flow of liquids in open conduits by measuring the upper and lower beads at a specified distance from an obstructing sill.

N TO THAT OF THE DIE OPENING. PARKWAY

A broad landscaped expressway which is not open to commercial vehicles.

OVERFLOW PIPE

Open pipe protruding above the surface of a liquid in a container, such as a distillation or absorption column or a toilet tank, to control the height of the liquid; excess liquid enters the pipe's open end and drains away.

OPEN CUT

An open trench, such as across a hill.

OPEN CAISSON

A caisson in the form of a cylinder or shaft that is open at both ends; it is set in place, pumped dry, and filled with concrete.

NONRECLOSING PRESSURE RELIEF DEVICE

A device which remains open after relieving pressure and must be reset before it can operate again.

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