Power, Heating and Ventilation: A Treatise for Designing and Constructing Engineers, Architects and Students, Μέρος 1Technical Press, 1908 - 647 σελίδες |
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ash pit bars bituminous coal boiler horse power boiler power braces brick brickwork bridge wall burner butt joint cast-iron cent CHAPTER check valve chimney computed condensation connected crow-foot Diameter of boiler dimensions discharge engine factor of safety feed water feet of heating fire fire-tube boilers flange flue fuel furnace fusible plug gases gate valve gauge given gives globe valve grate area heater heating surface injector joints latent heat length mechanical draft minute Horse power Number of tubes piston placed plant plates pounds of coal pounds of steam pounds per square pump rate of combustion rear Revolutions per minute riveted screw shell shown in Fig side single boiler smoke pipe space square feet square foot square inch steam pressure steel stoker surface per horse Table tank temperature thickness trap tubular boilers usually vertical water line water-tube boilers weight Width of setting wrought iron
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Σελίδα 143 - The following table has been calculated on this basis. The figures opposite the intersection of any two sizes is the number of the smaller-sized pipes required to equal one of the larger.
Σελίδα 165 - Fig. 116 is designed for a vertical pipe. The valve proper consists of two discs of unequal area, the combined area of which equals that of the pipe. The force tending to open the valve is that due to the steam pressure acting on an area equal to the difference in area between the two discs; it is clear from the cut that the pressure acting on the larger disc tends to open the valve while the pressure on the smaller acts in the opposite direction. The...
Σελίδα 143 - At the same \elocity of flow the volume delivered by two pipes of different sizes is proportioned to the squares of their diameters ; thus, one 4-inch pipe will deliver the same volume as four 2-inch pipes. With the same head, however, the velocity is less in the smaller pipe, and the volume delivered...
Σελίδα 1 - Centennial standard, and to recommend that in all standard trials the commercial horse-power be taken as an evaporation of 30 pounds of water per hour from a feed-water temperature of 100° F. into steam at 70 pounds...
Σελίδα 50 - The usual requirements are that the plates shall have a tensile strength of not less than 55,000, nor more than 60,000 pounds per square inch of section, with not less than 56 per cent. of ductility as indicated by contraction of area at point of fracture; and an elongation of 25 per cent. in a length of 8 inches. The heads are made of 'flange' steel, which is an extra quality of open-hearth steel, made with special reference to toughness and ductility.
Σελίδα 164 - Valve. This is a form of relief valve which is placed in the outboard exhaust pipe to prevent the pressure in the heating system from rising above a given point. Its office is the reverse of the reducing valve, which supplies more steam when the pressure becomes too low. The form shown in Fig.
Σελίδα viii - SUPERHEATED STEAM is steam heated to a temperature above that due to its pressure. DRY STEAM is steam which contains no moisture. It may be either saturated or superheated. WET STEAM is steam containing intermingled moisture, mist or spray.
Σελίδα 134 - Every heating and every power plant should be provided with automatic means for closing the dampers when the steam pressure reaches a certain point, and for opening them again when the pressure drops. There are various regulators designed for this purpose, a simple form of which is shown in Fig.
Σελίδα viii - F. As the pressure is increased, as by the steam being generated in a closed vessel, its temperature, and that of the water in its presence, increases. Saturated Steam is steam of the temperature due to its pressure — not superheated. Superheated Steam is steam heated to a temperature above that due to its pressure. Dry Steam is steam which contains no moisture.
Σελίδα 177 - In order to work satisfactorily, the trap should be placed at least 3 feet above the water-level in the boiler, and the pressure in the returns must always be sufficient to raise the water from the receiver to the trap against atmospheric pressure, which is theoretically about 1 pound for every 2 feet in height. In practice there will be more or less friction to overcome, and suitable adjustments must be made for each particular case. Fig.