I.C.S. Reference Library: A Series of Textbooks ...1907 |
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
allowed American rules ammonia apparent slip ash-pit bars blade blow blow-off bolted British thermal units burn butt joint Canadian rules carbon cent check-valve coal cock coil combustion chamber condenser connected cool cylinder distance engine evaporated expanded factor of safety feedpipe feedwater feet fire fire-tube boilers fitted flanged force fuel fulcrum furnace flues gases grate head heater heating surface horsepower hydrogen inch thick inches in diameter injector inside iron lap joint leak lever marine boilers nozzle nuts outer row oxygen paddle wheel passes pitch placed plate plug pounds per square pump revolutions per minute rivets rule in Art safety valve saturation Scotch boiler screw propeller seams shown in Fig smokestack speed square inch staybolts stayrods stays steam drum steam pipe steam pressure steel stop-valve suction pipe temperature tensile strength tube-sheet tubes usually velocity vessel water gauge water-tube boilers weight
Δημοφιλή αποσπάσματα
Σελίδα 34 - ... opening, in the following manner, to wit : Cylinder boilers with flues shall have one plug inserted in one flue of each boiler ; and also one plug inserted in the shell of each boiler from the inside, immediately before the fire line, and not less than four feet from the forward end of the boiler.
Σελίδα 43 - C% = 100 when the plates are not exposed to the impact of heat or flamer and the stays are fitted with nuts and washers, the latter being at least three times the diameter of the stay, and two-thirds the thickness of the plates they cover. C = 90 when the plates are not exposed to the impact of heat or flame and the stays are fitted with nuts only.
Σελίδα 40 - C_ 200 for stays fitted with doubling plates which have a thickness equal to at least 0.5 of the thickness of the plate reinforced, and covering the full area braced (up to the curvature of the flange, If any), riveted to either the Inside or outside of the plate, and stays having one nut outside and one Inside of the plates. Washers or doubling plates to be substantially riveted. For T take 72 percent of the combined thickness of the two plates. c.
Σελίδα 2 - It is further supposed, by chemists, that at a given pressure and temperature equal volumes of all gases, whether simple or compound, contain the same number of molecules. Thus, a cubic foot of hydrogen, a cubic foot of air, a cubic foot of steam, all contain the same number of molecules at the same temperature and pressure.
Σελίδα 32 - Carbonate of lime will not dissolve in pure water, but will dissolve in water that contains carbonic-acid gas. It becomes insoluble and is precipitated in the solid form when the water is heated to about 212°, the carbonic-acid gas being driven off by the heat. ~>'~. Sulphate of lime dissolves readily in cold water, but not in hot water. It precipitates in the solid form when the water is heated to about 290°, corresponding to a gauge pressure of 45 pounds.
Σελίδα 34 - As long as the plug is well covered with water, the fusible metal is kept from melting by the comparative coolness of the water; but should the water sink low enough to uncover the top of the plug, the filling quickly melts and allows the steam to rush out; thus giving warning of the shortness of water. The plug shown has a conical filling, the larger end of the filling receiving the steam pressure. The conical form of the filling prevents its being blown out by the steam pressure.
Σελίδα 49 - P= working pressure in pounds. D= least horizontal distance between tube centers in inches. d= inside diameter of tube in inches. W= extreme width of combustion chamber in inches. T— thickness of tube sheet in inches.
Σελίδα 44 - Board's rules for iron boilers may be increased as follows : — The constants for flat surfaces when they are supported by stays screwed into the plate and riveted, 10 per cent. The constants for flat surfaces when they are supported by stays screwed into the plate and nutted, or when the stays are nutted in the steam space, 25 per cent. This is also applicable to the constants for flat surfaces stiffened by riveted washers or doubling strips, and supported by nutted stays.
Σελίδα 31 - The air outside the chimney being heavier, it presses on the surface of the water in the right leg and forces some of it up the left leg ; the difference in the two water levels //and Z in the legs represents the intensity of the draft and is expressed in inches of water.
Σελίδα 23 - In the compression system the ammonia pump draws the gas from the expansion coils, but in the absorption system the removal of the gas is effected by allowing the gas from the expansion coils to mingle with the weak solution of ammonia from which the gas was expelled in the still or generator A. During the process of generating the ammonia gas in the still A, the strong solution rises to the top on account of its smaller specific gravity, and the weaker solution settles to the bottom and flows through...