. The Locomotive . purpose. Fig. i shows a ring of steel, hoop-shaped in section, which is sometimes used inbuilding up flues in the place of the T-irou ring illustrated in Fig. 2. The advantageclaimed for this form of joint is, that it has a certain amount of elasticity, and that ityields sufliciently to prevent any very severe strain from unequal expansion and con-traction in the flue and boiler. This form of ring should be made in one piece and beshrunk on, and then riveted. It should be caulked on the outside, and on the insidealso if the flue is large enough to admit of it. At the present
. The Locomotive . purpose. Fig. i shows a ring of steel, hoop-shaped in section, which is sometimes used inbuilding up flues in the place of the T-irou ring illustrated in Fig. 2. The advantageclaimed for this form of joint is, that it has a certain amount of elasticity, and that ityields sufliciently to prevent any very severe strain from unequal expansion and con-traction in the flue and boiler. This form of ring should be made in one piece and beshrunk on, and then riveted. It should be caulked on the outside, and on the insidealso if the flue is large enough to admit of it. At the present time, flues are rolled of all lengths up to 18 feet. If a longer boileris required, 21 feet long for example, it is customary to use a rolled flue 18 feet long,pieced out with an additional section three feet in length. The joint where the fluesections come together gives stiffness enough, ordinarily, to prevent the collapse of theshorter segment: but the long section should be supported by some additional Steel Hoop. 20 THE LOCOMOTIVE [FEBKUAltY, Kings of angle-iron, or of T-iron like that shown in Fig. 3, may be riveted around theflue at intervals of from 3 to 5 feet, to give the necessary stiffness, or the device shownin Figs. 4 and 5 may be adopted. There is some liability to overheating when theangle-iron is riveted directly to the flue, yet this is often done without giving rise to anysuch trouble. The ring shown in Figs. 4 and o seems suiierior to the plain ring, how-ever, because water can circulate freely between the rivets, cooling both the rivets andthe flue, and greatly lessening the likelihood of overheating. It consists of a ring ofangle-iron or U-iron, made in halves, with the ends riveted together by a double strap,as indicated in the cuts. There is a free space of about one inch between the ring andthe flue, all around, and the two are kept apart by thimbles that are spaced 5 or 6inches apart. The ring and the flue are secured to one another by rivets
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Keywords: ., bookauthorhartfordsteamboilerin, bookcentury1800, bookdecade1860
