Identifier: layingoutforboil01newy (find matches)
Title: 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
Year: 1907 (1900s)
Authors:
Subjects: Steam-boilers Sheet-metal work
Publisher: New York, The Boiler maker
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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ingleriveting; the calculations for thickness of plates and the rivet-ing will be shown later, the idea being to have the drawing inoutline, and then go over all the calculations when this isfinished. We have located the position of the back tube sheet, so willdraw it in, arranging to turn the top flange down (for top plateof combustion chamber or wrapper) at a distance from centerof boiler of 31^4 inches; this gives a space between top of com-bustion chamber and top of shell of approximately 28 per cent,of the diameter of boiler, which is about as small as can bemade with good results; should it be made any smaller itwould decrease the water surface and steam space of boiler. We now have the top of combustion chamber located, andthe bottom is fixed by the bottom of furnaces, so we can pencilin the back sheet, which is 6 inches in the clear from the backhead at bottom and 9 inches in clear at the top; this head isflanged, using a radius of iH inches. HOW TO LAY OUT A SCOTCH BOILER 107
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xo8 LAYING OUT FOR BOILER: MAKERS ARRANGEMENT OF TUBES. We now have the location of combustion chamber in theside view of boiler; we will arrange for each furnace to havea separate combustion chamber, so will start to draw them inon the front view of boiler. We draw in the line showingthe top 3iyi inches up from the center line of boiler, androughly arrange the tubes to see just where the wide waterspaces will be (between the nests of tubes) ; in the center nest,we find that we can get 7 vertical rows, that is. over the middlefurnace. Over the wing furnaces we find that we can get 10 verticalrows over each; this wiH give us 85 tubes in the middle nestand 86 tubes in each wing nest, making a total of 257 tubes. The tubes are arranged with a space of i inch between them,vertically, and 1% inches horizontally, making the pitch 3^inches vertically and 4 inches horizontally. The tubes form-ing the wide water space are spaced 14 inches from center tocenter; this allows a water space between

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