Steam-boilers: Their Theory and DesignLongmans, Green, and Company, 1903 - 375 pages |
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Common terms and phrases
allowed amount anthracite arranged Asbestos ash-pit bituminous coals boiler bolts bottom brazed brick bridge wall burned calorimeter carbon carbon dioxide carbon monoxide cast-iron cent centre chimney clean combustion-chamber copper corrosion cylindrical draft elastic limit engine evaporation feed-water feet fire fire-box fitted flange flat flue fuel furnace furnace-flues grate head heat of combustion heat-units heater heating surface holes horse-power hot gases hydrogen inch thick inches in diameter increase iron joint latent heat length less liable longitudinal seams magnesia marine metal moisture nuts oxygen Péclet pipe pitch placed pound of coal pounds per square quantity rate of combustion rivets shear sheet shell smoke space specimens square inch stack stay-bolts stays steam pressure steam-pipe steam-space steel stokers superheater surface condenser temperature tensile strength total heat tube-sheet tubes usually valve vertical water-tubular weight Wrought iron
Popular passages
Page 358 - Close throttle, and keep closed long enough to show true level of water. If that level is sufficiently high, feeding and blowing will usually suffice to correct the evil. In case of violent foaming, caused by dirty water or...
Page 205 - W W = width of combustion box in inches. P = pitch of supporting bolts in inches. D = distance between the girders from centre to centre in inches. L = length of girder in feet. d = depth of girder in inches. T = thickness of girder in inches. C = 500 when the girder is fitted with one supporting bolt.
Page 204 - Should any such test bar fail in either the tensile or bending test, no bars from such heat shall be allowed to be used in the construction of any marine boiler. Where a heat of steel bars has been passed by an inspector, separate lots of bars...
Page 350 - Loss due to unconsumed hydrogen and hydrocarbons, to heating the moisture in the air, to radiation, and unaccounted for. (Some of these losses may be separately itemized if data are obtained from which they may be calculated.) Totals...
Page 203 - Where flat surfaces exist, the inspector must satisfy himself that the spacing and distance apart of the bracing, and all other parts of the boiler, are so arranged that all will be of not less strength than the shell, and he must also after applying the hydrostatic test, thoroughly examine every part of the boiler.
Page 350 - CO' °' and N are the percentages by volume of the several gases. As the sampling and analyses of the gases in the present state of the art are liable to considerable errors, the result of this calculation is usually only an approximate one. The heat balance itself is also only approximate for this reason, as well as for the fact that it is not possible to determine accurately the percentage of unburned hydrogen or hydrocarbons in the flue gases.
Page 359 - Clean Sheets. Particular care should be taken to keep sheets and parts of boilers exposed to the fire, perfectly clean; also all tubes, flues, and connections well swept. This is particularly necessary where wood or soft coal is used for fuel.
Page 168 - ... 160 for iron plates, fitted with stays with double nuts and washers riveted to the outside of the plates, of at least -| of the pitch in diameter and J the thickness of the plates.
Page 166 - The working pressure allowed on flat surfaces fitted with screw stay bolts riveted over, screw stay bolts and nuts, or plain bolt with single nut and socket, or riveted head and socket, will be determined by the following rule : When plates 7-16 inch thick and under are used in the construction of marine boilers, using 112 as a constant, multiply this by the square of the thickness of plate in sixteenths of an inch. Divide this product by the square of the pitch or distance from center to center...
Page 168 - But no flat surface shall be unsupported at a greater distance in any case than 16 inches, and such flat surfaces shall not be of less strength than the shell of the boiler, and able to resist the same strain and pressure to the square inch. In allowing the strain on a screw staybolt, the diameter of the same shall be determined by the diameter at the bottom of the thread.