Definitions
from The Century Dictionary and Cyclopedia
 n. Warmed water supplied to the boiler of a steamengine by the feedpump through the feedpipe.
Etymologies
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Examples

The new feedwater pump was everything the Master Shipwright had promised on the installation side, Captain Dubinin noted.

The sludge is also found serviceable for softening the feedwater of steam boilers by the common liming process; although it has been stated that the material contains certain impurities  notably "fatty matter"  which becomes hydrolysed by the steam, yielding fatty acids that act corrosively upon the boilerplates.

The object is to obtain the average feedwater temperature during the test period.

The factor of evaporation has a certain value corresponding to every feedwater temperature and boiler pressure, and the values of this factor are given in the accompanying table.

What is wanted in a test is the average pressure of the steam in the boiler, therefore, observe the pressure at regular intervals, just as with the feedwater temperature, and mark down these gage readings.

If there is no thermometer in the feed line, take the feedwater temperature by means of a thermometer hung in barrel 3 (figure 2) by a hook over the edge of the barrel.

In other words, to increase the efficiency from 54 per cent to 65 per cent under the same conditions of pressure and feedwater temperature, it would be necessary to increase the actual evaporation from 7 pounds to 8.36 pounds.

If the steam pressure is 100 pounds gauge, and the feedwater temperature is 180° F. the factor of evaporation is 1.0727, then the actual evaporation must be 9 ÷ 1.0727 = 8.36 pounds per pound of coal.

From the data of the test, both the average feedwater temperature and the average steam pressure are known, and so it is a simple matter to find out the amount of heat needed to evaporate 7 pounds of water from the average temperature to steam at the average pressure.

So, in the table locate the column headed 100 and follow down this column to the line having 180 at the ends, and the value where the column and the line cross is 1.0727, which is the factor of evaporation for a feedwater temperature of 180° F. and a steam pressure of 100 pounds, gage.
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