A Handbook for Steam Users: Being Rules for Engine Drivers and Boiler Attendants, with Notes on Steam Engine and Boiler Management and Steam Boiler Explosions

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Longmans, Green, and Company, 1887 - Steam engineering - 95 pages
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Page 55 - ... of an inch. As the area of circles, or similar parts of circles of different sizes, are directly proportional to the squares of their diameters, it follows that if we wish to find the volume of...
Page 48 - Let 17 times the length of the grate in inches be divided by the square root of the height of the chimney in feet, and the quotient is the area for the aperture at the top of the chimney in inches.
Page 7 - Shortness of water generally arises from neglect of the boiler attendant, and ought not to occur. It is by no means easy to give precise instructions as to what should be done to put things right when shortness of water has occurred, so as to meet every case. Drawing the fires when the water is out of sight must always be a matter of more or less risk, as there is a difficulty in determining how far and for how long a time the furnace crowns have been laid bare. If it is known that the water has...
Page 7 - ... difficulty in determining how far and for how long a time the furnace crowns have been laid bare. If it is known that the water has only just passed out of sight, say from the sticking fast of the blow-out tap when attempting to shut it, the fires may be drawn with safety. But if an empty gauge glass has been mistaken for a full one, and the boiler has been worked on in this state for some time, the case will be different. Again, there would be more risk in drawing the fires from a plain furnace...
Page 50 - Multiply the number of square feet of water- surf ace, by the evaporation in inches of gauge-glass, multiply the product by 5, and divide the result by the number of minutes occupied in evaporation. To find the quantity of water in Ibs.
Page 55 - Book and as it gives results for such small increments of height and contains no errors, it will be found of great value where accuracy is desired. The volume of water space is easily found by subtracting the area of steam space from area of whole boiler, deducting area of tubes, and multiplying by the length of boiler, as in the former case. The table will also be found useful when designing boilers in calculating the area of portions of the head above the tubes which require bracing, or for any...
Page 50 - Nominal horse-power of vertical cross tube boilers : Add together the diameter of the shell, the diameter of the fire box, the diameters of all the tubes, and the diameter of the uptake tube, all in feet; multiply the sum by the length in feet, and divide by 10.
Page 48 - ... the area of firegrate without taking into account the height of the chimney. Another useful rule is to allow from 2 to 3 square feet for each boiler, having about 30 square feet of firegrate, the former allowance answering for chimneys over 150 feet high, which discharge the gases from several furnaces working together, and the latter for chimneys under 150 feet high, with not over six furnaces. There are many tall chimneys...

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