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A rotary compressor in which a multiblade rotor revolves in a casing partly filled with liquid, for example, water.



Related Terms

HERMETIC MOTOR

Compressor drive motor sealed within same casing which contains compressor.

AXIAL FLOW COMPRESSOR

A compressor that uses rotor blades shaped like airfoils that give the air a high velocity and push it into subsequent stationary blade passages that convert the velocity energy into pressure. This process is repeated through several stages. The airflow movement is axial.

PERFORMANCE CHART

Graphical representations showing the abilities of rotating equipment at various operating conditions; for example, the performance curve for a compressor would include rotor speed for various intake and outlet pressures versus gas flow rate adjusted for temperature, density, viscosity, head, and other factors.

BALANCED VANE

Has two inlet ports and two outlet ports. Reduces the side loading on the rotor.

CONDENSATION

The change of state from vapor/gas into a liquid, reverse to evaporation. If a vapor becomes supersaturated, condensation takes place and heat is surrendered. For example, in a seawater cooled condenser, a compressor has raised the pressure of the vapor to such an extent that at seawater temperature, it is supersaturated. Condensation takes place, and the latent heat released heats up the water passing through the condenser tubes; the heated seawater passing overboard into the sea, to be replaced continuously by fresh cool water. The resulting condensate will be somewhat warmer than the seawater coolant.

CARGO AREA

That part of the ship which contains the cargo containment system, cargo pumps and compressor rooms, and includes the deck area above the cargo containment system. Where fitted, cofferdams, ballast tanks and void spaces at the after end of the aftermost hold space or the forward end of the forward-most hold space are excluded from the cargo area.

PUMP PRESSURE RELIEF VALVE

Positive displacement pump systems are fitted with a relief (regulating) valve for adjusting pump discharge pressure and to avoid the possibility of rupturing the pump casing or discharge pipe.

VOID SPACE

An enclosed space in the cargo area external to a cargo containment system, other than a hold space, ballast space, fuel oil tank, cargo pump or compressor room or any space in normal use by personnel.

COMPRESSOR

A device which converts mechanical force and motion into pneumatic flow power.

COMPRESSION RATIO

The ratio of the absolute pressure at the discharge from a compressor divided by the absolute pressure at the suction. For internal combustion engines compression ration is absolute pressure at the end of compression stroke divided by absolute pressure at beginning of this stroke

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