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 by Unknown

Author:Unknown
Language: eng
Format: epub, pdf
Tags: Steam-boilers, Sheet-metal work
Publisher: New York, The Boiler maker
Published: 1907-03-25T05:00:00+00:00

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Fig: 128

Fig. 199

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Fig.130

Fig. 131

Fig. 133

to make. The covering for the gusset sheet, dome course, back head, etc., are considerably more difificult.

The sheet for the dome course extends on in as near the body of the dome as possible, and the seam is lapped over on the top as shown in Fig. 125. The width of this sheet, W, would be made sufficient to cover the dome course, and give from I to iVz inches between this sheet and the one that covers the next course. When the sheets are put in position, they are held in place by a circular band. Fig. 126, about 3 inches in width, and in length to extend all around the boiler and allow 4 or 5 inches lap. These bands are beaded on the ends, first for appearance, and, secondly, in order to make a neater fit between the band and the sheets which it holds in place.

A section of the beading is shown in Fig. 127. A is the portion that is bent down and rests on the sheet, thus closing up the air-space and making the covering very tight. The band is clamped together by means of bolt B. Fig. 128, and a pair of clips, C and C. The clips are riveted to the band by several quarter-inch rivets. The one clip is placed near the end of the band, and the other clip is placed from the end 5 or 6 inches, depending upon the amount of the lap. The exact location for the second clip is obtained by placing the band

naturally come, the lagging must be brought a little further ahead, or stopped off a little further back, in order that this ring may rest against the boiler without interfering with the rivets. The lagging cover for the gusset sheet is to be laid out as shown in Fig. 131. Get the drawing for the boiler and make a sketch for the large and small neutral diameter, and also the distance of these diameters from each other. Now, to these figures add the thickness of the shell and the thickness of the lagging, and to this add ^ inch extra on account of the inability to fit up the lagging and the covering and some air space. These figures give us the size of the cone for slope-sheet covering.

We lay out these figures as shown in Fig. 131, and continue the slope line C D until it strikes the bottom line A B at the point C. This is the center of the cone. From this point strike two reference arcs AE and BF. .Also draw semi-circles on BD and AC, and divide these into four equal parts. From A and B as centers, with the trams project these points on the diameter. From the point B, w-ith a radius equal to the length of the arc B-2, strike a circle as shown. Now measure off the radial distance from the reference circle to the point /, and step off this distance from the reference circle and determine the point i\.

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