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A type of feedwater heater operating with water and steam in direct contact. It is designed to heat the water and drive off oxygen.

Related Terms

SKIN CONDENSER

Condenser using the outer surface of the cabinet as the heat radiating medium.

RETURN-STEAM CONDENSATE

That steam produced by a boiler which returns to the boiler after it has condensed.

REFRIGERATING CAPACITY

The ability of a system to remove heat as compared with the cooling effect produced by melting of ice.

CORROSION INHIBITOR

Additive for protecting lubricated metal surfaces against chemical attack by water or other contaminants. There are several types of corrosion inhibitors. Polar compounds wet the metal surface preferentially, protecting it with a film of oil. Other compounds may absorb water by incorporating it in a water-in-oil emulsion so that only the oil touches the metal surface. Another type of corrosion inhibitor combines chemically with the metal to present a non- reactive surface.

CRACKING

The process whereby large molecules are broken down by the application of heat and pressure to form smaller molecules.

ADIABATIC PROCESS

A thermo-dynamic process in which no heat is extracted from or added to the system of the process.

REFRIGERATOR

A device to transfer heat from a low temperature to a high temperature medium.

COOLANT

A fluid used to remove heat. See Cutting fluid.

DEMULSIBILITY

The ability of a fluid that is insoluble in water to separate from water with which it may be mixed in the form of an emulsion.

HALF-TIDE BASIN

A lock of very large size and usually of irregular shape, the gates of which are kept open for several hours after high tide so that vessels may enter as long as there is sufficient depth over the sill. Vessels remain in the half-tide basin until the ensuing flood tide before they may pass through the gate to the inner harbor. If entry to the inner harbor is required before this time, water must be admitted to the half-tide basin from some external source.
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