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 . be best to measure the space in the clear between themud-ring shoes, and mark the crown sheet to cut this will seldom take in all the warped material, the sidesand flanges will have to be straightened. The new sheet isthen gotten out and placed in position by tilting the boileruntil the bottom is open enough to allow the sheet to pass andenter the steam chamber. The side seams are marked, and thecrown plate pushed
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 . be best to measure the space in the clear between themud-ring shoes, and mark the crown sheet to cut this will seldom take in all the warped material, the sidesand flanges will have to be straightened. The new sheet isthen gotten out and placed in position by tilting the boileruntil the bottom is open enough to allow the sheet to pass andenter the steam chamber. The side seams are marked, and thecrown plate pushed back on the flues. Then these holes areeither screw punched or drilled. In order to more readily hold on the rwtif, four hand-holesare cut in the sides, their bottom coming on the dotted linerepresenting the level of the crown sheet, shown in Fig. of these boilers are equipped by the builders with a hand-hole in the back head. In case the boiler in question has none,it will be well to examine the arrangements of the braces inthe back and before cutting one in. Very often the rows ofT-irons will not allow a hand-hole to be cut above the crown. .<sr. fig. 23 Fig. 21 Fig. 22 dome flange is found to come within this margin, it may betapped out and a hollow middle stay used. After the hole isdrilled, it may be found that there is not enough space to usea spindle tap. A piece of round iron, small enough to gothrough the hole, is then threaded and welded to a stay-bolt,as shown at M. That makes a steam-tight fit in the crownsheet. Two nuts and washers are then screwed on the otherend of the bolt, one above and one below the wagon top. Theone coming below the wagon top may be fished into positionthrough the back head hand-hole plate, or strung through asteam passage hole in the wagon top. As the holding powerin the thread of a ^-inch sheet is insufficient to allow the boltto be driven while held by its own tenacity, it will be necessaryto use an offset bar through the han
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
