Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . H ©e-i-•?--*- + + + + +-*-+© e©+ -f + + t 4 + ©©© FIG. 7.—BOX OF DRY PIPE. Qrcurw? Where: 5 =: Load on springs in pounds. D =^ Diameter of spring in inches from center to center of = The diameter, or side of square, of wire in = 8,000 for round steel, 11,000 for square steel. diameter. The area of these holes should aggregate at leasttwo to three times the area of the steam outlet, so that thepassage of the
Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . H ©e-i-•?--*- + + + + +-*-+© e©+ -f + + t 4 + ©©© FIG. 7.—BOX OF DRY PIPE. Qrcurw? Where: 5 =: Load on springs in pounds. D =^ Diameter of spring in inches from center to center of = The diameter, or side of square, of wire in = 8,000 for round steel, 11,000 for square steel. diameter. The area of these holes should aggregate at leasttwo to three times the area of the steam outlet, so that thepassage of the steam through them will not be hurried norrestricted. The material used is Xo. 12 or Xo. 14 gage sheetiron, and it is held in place against the top of the shell bythree or four rivets on either side. Some makers put separat-. FIG. 8.—CYLIXDRIC.\L DRV PIPE. The pressure or load on a spring-loaded safety valve may be found by the formula d X 2 = 5 D Where: d ^ Diameter of wire in sixteenths of an inch. D = Diameter of spring in inches from center to center of = Load on spring in pounds. ing washers on these rivets, thereby leaving a narrow spacearound the top between the shell and the dry pipe. The writer knows of one instance at least where the boilerwith a dry pipe made with an open strip around the top gavea good deal of trouble by priming. The steam space was ratherlimited, and it was suggested that the water was drawn by thesteam (aided by capillary action) around the shell throughthis opening into the steam pipe. Whether this was the caseor not, this dry pipe was removed and one similar to the one
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
