Definitions

from The Century Dictionary and Cyclopedia

  • n. Warmed water supplied to the boiler of a steam-engine by the feed-pump through the feed-pipe.

Etymologies

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Examples

  • The new feed-water pump was everything the Master Shipwright had promised on the installation side, Captain Dubinin noted.

    The Sum of all Fears

  • The sludge is also found serviceable for softening the feed-water 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 boiler-plates.

    Acetylene, the Principles of Its Generation and Use

  • The object is to obtain the average feed-water temperature during the test period.

    Engineering Bulletin No 1: Boiler and Furnace Testing

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

    Engineering Bulletin No 1: Boiler and Furnace Testing

  • 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 feed-water temperature, and mark down these gage readings.

    Engineering Bulletin No 1: Boiler and Furnace Testing

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

    Engineering Bulletin No 1: Boiler and Furnace Testing

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

    Engineering Bulletin No 1: Boiler and Furnace Testing

  • If the steam pressure is 100 pounds gauge, and the feed-water 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.

    Engineering Bulletin No 1: Boiler and Furnace Testing

  • From the data of the test, both the average feed-water 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.

    Engineering Bulletin No 1: Boiler and Furnace Testing

  • 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 feed-water temperature of 180° F. and a steam pressure of 100 pounds, gage.

    Engineering Bulletin No 1: Boiler and Furnace Testing

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