Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . e purposes of inspection and wash-ing out of the boiler. Through stay rods are usuallyspaced 14 in. apart horizontally and about the samedistance vertically. The ends, as far back as thethreads run, are swaged larger than the body, so thatthe diameter at the bottom of the thread is greaterthan the diameter of the body. There are several 316 ENGINEERING methods of applying through stays. One of the mostcommon, especially for land boilers, is to allow theends of the rod • to project through the plat
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . e purposes of inspection and wash-ing out of the boiler. Through stay rods are usuallyspaced 14 in. apart horizontally and about the samedistance vertically. The ends, as far back as thethreads run, are swaged larger than the body, so thatthe diameter at the bottom of the thread is greaterthan the diameter of the body. There are several 316 ENGINEERING methods of applying through stays. One of the mostcommon, especially for land boilers, is to allow theends of the rod • to project through the plates to bestayed, and holding them in place by a nut and copperwasher, both inside and outside the plate. Anotherand still better plan is to rivet 6-in. channel bars across the head, inside above the tubes, the numberof bars dependingupon the height of thesegment to be channel barsare drilled to corre-spond with the holesthat are drilled in theplate to receive the stay rods, which latter are thensecured by inside and outside nuts and copper washers. jTTSW T 10 x i° / u FIGURE FIGURE 107. These channel bars act as girders and serve to greatlystrengthen the head or flat plate. Fig. 107 will serveto illustrate this method. THE BOILER 317 Sometimes a combination of channel bar anddiagonal crow foot braces is used, as shown by Fig. 108. A good form of diagonal crow foot stay is obtainedby using dou-ble crow feet,made of piecesof boiler platebent as shownby Fig. 109and riveted tothe plate byfour rivets. Ahole is drilledthrough thebody of thecrow foot, anda bolt pass-ing throughthis secures th
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