Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors

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. 1913 Excerpt: ...in the water space frame being very long, the amount of material of the rivet is not exactly equal to the rivet hole, and therefore we have a loose rivet. In the circumferential seam there is apt to be a Removing rivets. slight difference in circumference between the fitting surface of the two sheets and this would mean that unless the sheets were drawn together very firmly, there would be a small gap between the sheets. As one rivet after another is driven, each rivet pulling a certain amount upon the sheet, there will be a time when the longest rivet will be relieved of its weight and we would have a rivet to be taken out. Fig. 163 illustrates the method for removing a rivet which has an outside head. The punch P is set against Furnace bearers. the head of the rivet and is hit several hard blows with the sledge hammer.9 The head R will thus be removed by a failure of both shear and bending. The tit T of the punch is now entered upon the rivet and the rivet punched out of place. A rivet like the one in Fig. 164 is removed by applying the punch P as indicated. In this case the rivet is punched directly through the sheet. There are other cases of bad rivets besides those mentioned. If the rivet is machine driven and if the boiler has not been raised to the proper height, a rivet will be driven with the head out of the center of the rivet. This can readily be seen on the boiler on account of the uniform pitch as the eccentricity of the head makes the pitch unequal. Many boilers are supported upon the frame by means of "furnace bearers." These are frequently attached to Stay bolts. the side sheet by studs and on account of the excessive weight of the boiler, filled with water, the studs are tapped into both the sides sheet and the liner. These studs ...