New book of instruction and tables for use with the everready pipe and elbow chart (designed for sheet metal and boiler workers) by Pehl Max William 1878-

Author:Pehl, Max William, 1878- [from old catalog]
Language: eng
Format: epub, pdf
Tags: Sheet-metal work, Pipe
Publisher: New York, U. P. C. book company, inc.
Published: 1921-03-25T05:00:00+00:00

Carrying Capacities of Round and Rectangular Air Pipes

THE relative carrying capacity of air pipes carrying heated air, as influenced by the shape of the air pipe, was discussed at some length at one of the lectures before a class in heating conducted by James A. Donnelly, at the Harlem Branch of the Y. M. C. A., New York. Mr. Donnelly has expanded his talk on this detail since that time and supplied the information given below, accompanied by a chart.

He considers that the relative carrying capacity of round and rectangular section pipes may be very closely estimated on the basis of formulas of the flow of fluids through pipes. He therefore goes to the Weisbach formula, which, he explains, states that the comparative carrying capacity for various forms or shapes of pipes is proportional to an expression which is the product of the area and the square root of the quotient of the area divided by the perimeter of the pipe. The perimeter is, of course, the distance around the pipe. If the pipes to be compared are all to have the same area then the carrying capacity of pipes of equal area, but of different shape, is proportional to the quotient of the square root of the perimeter divided by the perimeter.

To apply the foregoing, four different shape pipes have been considered, each with an area of 144 sq. in. A circle with a diameter of 13.54 in. has an area of 144 sq. in. Similarly a square duct 12 in. on a side has this area, also a rectangular duct 6 x 24 and one 4 x 36 in. The perimeter—that is, the circumference—of the

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