Steam-Boilers; Their Theory and Design

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ... = least inside diameter+2 inches. where--pressure in pounds; y=thickness in inches, not less than five-sixteenths; D = mean diameter in inches; C = 14,000, a constant, when corrugations are not more than 8 inches from center to center and not less than 1J inches deep. PURVES TYPE. P CXT where P= pressure in pounds; T= thickness in inches, not less than seven-sixteenths; D=least outside diameter in inches; C= 14,000, a constant, when rib projections are not more than 9 inches from center to center aud not less than 1 inches deep. The thickness of corrugated and ribbed furnaces shall be ascertained by actual measurement. The manufacturer shall have said furnace drilled for a one-fourth inch pipe tap and fitted with a screw plug that can be removed by the inspector when taking this measurement. For the Brown and Purves furnaces the holes shall be in the center of the second flat; for the Morison, Fox, and other similar types in the center of the top corrugation, at least as far in as the fourth corrugation from the end of the furnace. TYPE HAVING SECTIONS 18 INCHES LONG. 1 D where P= pressure in pounds; T= thickness in inches, not less than seven-sixteenths; 2)=mean diameter in inches; (7=10,000, a constant, when corrugated by sections not more than 18 inches from center to center and not less than 21 inches deep, measuring from the least inside to the greatest outside diameter of the corrugations, and having the ends fitted one into the other and substantially riveted together, provided that the plain parts at the ends do not exceed 12 inches in length. A DAMSON TYPE. When plain horizontal flues are made in sections not less than 18 inches in length, and not less than five-sixteenths of an inch thick, and flanged to a depth of not less than three times the d...