"Cahall" Water Tube Steam Boilers: Cahall Vertical and Cahall-Babcock & Wilcox : Manufactured by the Aultman & Taylor Machinery Co

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Cahall Sales Department, 1897 - Steam-boilers, Water-tube - 98 pages
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Page 11 - The water space divided into sections, so arranged that should any section give out, no general explosion can occur, and the destructive effects will be confined to the simple escape of the contents; with large and free passages between the different sections to equalize the water line and pressure in all.
Page 9 - A mud-drum to receive all impurities deposited from the water in a place removed from the action of the fire. 3d. A steam and water capacity sufficient to prevent any fluctuation in pressure or water-level. 4th. A large water surface for the disengagement of the steam from the water in order to prevent foaming. 5th. A constant and thorough circulation of water throughout the boiler, so as to maintain all parts at one temperature. 6th. The...
Page 65 - COMMERCIAL EVAPORATION. 34. Equivalent water evaporated per pound of dry coal with one-sixth refuse, at 70 pounds gauge pressure, from temperature of 100 F.
Page 11 - The heating surface as nearly as possible at right angles to the currents of heated gases, and so as to break up the currents and extract the entire available heat therefrom.
Page 65 - ECONOMIC EVAPORATION. 31. Water actually evaporated per pound of dry coal, from actual pressure and temperature f Ibs. 32. Equivalent water evaporated per pound of dry coal from and at 212 Ff Ibs.
Page 11 - ... confined to the simple escape of the contents; with large and free passages between the different sections to equalize the water line and pressure in all. 7th. A great excess of strength over any legitimate strain ; so constructed as not to be liable to be strained by unequal expansion, and, if possible, no joints exposed to the direct action of the fire. 8th. A...
Page 21 - ... with its mixture of steam. The boiler rests upon four iron brackets riveted to lower, or mud drum, supported upon four piers of the foundation, the entire structure standing without contact with the brickwork, allowing the boiler freedom for expansion without in any way straining the brick setting. In all places where pipe connections are made to the boilers through the walls, they are encased in expansion boxes. Owing to the fact that the gases escape through the central opening in the upper...
Page 47 - ... Water Alarm. The blow-off valves are specially made under patents owned by the Aultman & Taylor Machinery Co., and are so designed that the discs are renewable at any time, and both the disc and valve seat can be cleaned without taking the valve apart. It will be noticed in the illustration (Fig. 4) giving the rear view of the boiler that these valves have two wheels, one directly above the other, the upper one being smaller than the lower. The larger wheel forces the disc down on its seat, the...
Page 17 - An external circulating pipe comes out from the upper or steam drum, just below the water level, and is carried downward, outside the brickwork, to a point just below the tube sheet of the lower drum, where it enters that drum. The're being no steam whatever in this external circulating pipe, and no possibility of making any, and there being, in the tubes connecting the two drums, steam in greater or less proportions, the result is (the volume in the external pipe having a considerably greater specific...
Page 41 - Figure 3, it will be noticed that each section of tubes is connected by napples to saddles on the steam drums. These saddles or cross boxes are made from open hearth steel, which is melted and run into molds. This steel, after cooling and annealing, presents all the chemical and physical properties of regular boiler plate steel, physical tests on a large number of coupons from these forms showing an elongation of over 25 per cent, a reduction in area of over 50 per cent, with a tensile strength of...

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