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The introduction of compressed air near the bottom of a tank or other container in order to agitate the liquid therein.

Related Terms


A cylindrical or spherical corrosion and pressure-resistant container from which acid is forced by compressed air to the agitator; used in manufacture of acids but largely superseded by centrifugal pumps. Also known as acid blowcase; acid egg.


A large valve located at the bottom of a tank or container used in emergency situations to empty the tank quickly; for example, to jettison fuel from an airplane fuel tank.


A fluid-holding tank with provisions to aerate its contents by bubbling air or another gas through the liquid or by spraying the liquid into the air.


A molding apparatus that forms hollow plastic articles by injecting the blowing air at the bottom of the mold.


A type of centrifugal cargo pump commonly found on gas carriers. The prime mover is usually an electric or hydraulic motor. The motor is usually mounted on top of the cargo tank and drives, via a long transmission shaft, through a double seal arrangement, the pump assembly located in the bottom of the tank. The cargo discharge pipeline surrounds the drive shaft and the shaft bearings are cooled and lubricated by the liquid being pumped.


A pipe leading to the bottom of an oil or water tank, for guiding a sounding tape or jointed rod when measuring the depth of liquid in the tank.
Sounding pipes in the engine room are normally fitted with deadweight cocks and screw caps. Caps and cocks should be closed at all times, except when sounding tanks.


  1. Opening and closing of a plastics mold in order to let gases escape during molding. Also known as degassing. 2. Movement of gas, vapors, or air in and out of a storage tank vent line as a result of liquid expansions and contractions induced by temperature changes.


  1. The melting of an electric fuse because of excessive current. 2. The bursting of a container (such as a tube pipe, pneumatic tire, or dam) by the pressure of the contained fluid. 3. The rupture left by such bursting. 4. The abrupt escape of air from the working chamber of a pneumatic caisson.


Tanks at the bottom or sides of a ship which are filled with seawater for ballasting purpose.


A forging hammer in which the ram and anvil are driven toward each other by compressed air or steam.

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