Handbook of the steam-engine. Containing all the rules required for the right construction and management of engines of every class, with the easy arithmetical solution of those ru by Bourne John

Author:Bourne, John
Language: eng
Format: epub, pdf
Tags: Steam-engines
Publisher: New York, D. Appleton
Published: 1874-03-25T05:00:00+00:00

ANOTHER EULE FOE FINDING THE SECTIONAL AREA OF EACJH EDGE FLANGE OF THE MAIN BEAM.

Rule. — Multiply the diameter of tlie cylinder in inches oy one-tliird of the length of the stroke in inches, and oy the total pressure on each square inch of the piston, and divide the product oy 650. The quotient is the proper sectional area in square inches of each flange or dead on the edge of the oeara.

Example 1.—What is the proper sectional area of the flange on the edge of the main heam of an engine with a 24-inch cylinder, 20 lbs. total pressure on piston per square inch, and 5 feet stroke ?

Here 24 x 20 (which is one-third of the stroke in inches) x 20 (the pressure of the steam and vacuum per square inch) = 9,600, which divided by 650=14 , 'T sq. in., which is the area required.

Example 2.—What is the proper sectional area of the flange on the edge of the main beam of an engine with a 60-inch cylinder, 12|-feet stroke, and with a pressure on the piston of 20 lbs. per square inch ?

Here 60 x 50 (which is one-third of the stroke in inches) x 20 (the pressure of the steam per square inch) = 6,000, which divided by 650 gives 92 as the sectional area of the edge bead in square inches. Such a flange, if 15^- inches broad, would be 6 inches thick. These results it will be seen are very nearly the same as those obtained by the preceding rule; and one inference from these rules is that nearly all engine beams are at present made too weak. The purpose of the web of the beam is mainly to connect together the top and bottom flanges, so that there is no advantage in making it thicker than suffices to keep the beam in shape; with which end, too, stiffening feathers, both vertical and horizontal, should be introduced upon the sides of the beam. The first cast-iron beams were made like a long hollow box to imitate wooden beams, and this form would still be the best, unless an open or skeleton beam, encircled with a great wrought-iron hoop after the American fashion, be adopted.

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