Pocket companion, containing telegraphic code, tables of standard dimensions of wrought iron pipe, tubes, &c - Softcover
Synopsis
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. 1883 Excerpt: ...for 100 degrees and by the length of the bar, and divide by 100. RULE FOR COMPUTING THE WEIGHT OF PIPES AND TUBES. D == External diameter of pipe in inches, d = Internal " " ' W= Weight of a lineal foot of pipe in lbs. Then W = K (D2--d2) K = 2.64 for wrought iron. 2.45 "cast iron. 2.82 "brass. 3.03 "copper. 3.86 "lead. What is weight per foot of a 3 inch standard boiler Example. tube? 3 inch (external diam.) squared = 9. 2.782 inch (internal diam.) squared = 7.739. 7.739 = 1.261, which X by 2.64= 3.33 lbs. weight per foot. PUMPING ENGINES. WEIGHTS AND MEASURES--Continued. MISCELLANEOUS--Continued. G = Number of gallons to be raised in 24 hours. F = Number of cube feet raised in 24 hours, ii = Height in feet to which the water is to be raised. H P = Actual horse-power required. HP= GXl1 or FXJl 4752000 762088 20 per cent, must be added to overcome friction, &c, and 50 or 60 per cent, more is usually allowed for contingencies, making a total of 70 or 80 per cent, additional power. TO FIND THE DIAMETER OF A SINGLE-ACTING PUMP. L = Length of stroke in feet. G = Number of galls, to be delivered per minute. F = Number of cubic feet to be delivered per minute. N = Number of stroke per minute. D = Diameter of pump in inches. F =.00545 D2 L N. G =.034 D2 L N..00545 L. N. Note.--These formulas give the net diameter of the pump plunger; it is usual to increase the area of the plunger J, to allow for leakage, &c. USEFUL NUMBERS FOE PUMPS. D = Diameter of pump in inches. S = Stroke of pump in inches. D2 S X 7854 = cubic inches. D2 S X.002833 = gallons. D2 S X.0004545 = cubic feet. D2 S X.02833 = lbs. fresh water. HORSE-POWER OF PUMPING ENGINES. Q = Quantity of water raised per minute cube feet. H = Height in feet. Actual horse-powe...
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