. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. tophead of the upright boiler can be temporarily repaired by a rowof holes drilled and tapped touching one another, with f or -Jinch copper plugs or bolts, screwed into the plates and after-wards all hammered together. For a permanent job, cut out the defect and rivet on a had better be put on the inside, so as to avoid a * pocketfor holding the dirt. In putting on all patches, the defectivepart must be entirely removed to the solid iron, especially whenexposed to
. American stationary engineering; a practical work which begins at the boiler room and takes in the whole power plant. tophead of the upright boiler can be temporarily repaired by a rowof holes drilled and tapped touching one another, with f or -Jinch copper plugs or bolts, screwed into the plates and after-wards all hammered together. For a permanent job, cut out the defect and rivet on a had better be put on the inside, so as to avoid a * pocketfor holding the dirt. In putting on all patches, the defectivepart must be entirely removed to the solid iron, especially whenexposed to the fiie. Note.—^When fire comes to two surfaces of any consider-able extent, the plate next to the fire becomes red-hot andweakens, hence the inside plate, in repairs, must be removed. The application of steel patches to iron boilers is and iron differ structurally and in every other particular,and their expansion and contraction under tlie influence cfchanging temperatures, is such that trouble is sure to resultirom their combination. t2^ Maxims and Instructions, DEFECTS AND NECESSARY REPAmS. heated and expanded tubes. Fig. 63 represents a patch calleda spectacle piece. This is usedto repair a crack situated betweenthe tube ends. These are usuallycaused (if the metal is not of badquality) by allowing incrustationto collect on the plate inside theboiler, or by opening the furnaceand smoke doors, thus allowing acurrent of cold air to contract themetal of the plates round the The spectacle piece is bored cut to encircle the tubesadjacent to the crack, or in other words, to be a duplicate ofa portion of the tube plate cracked. These plates are thenpinned on to the tube covering the crack. Steam generators, as they are exposed to more or less of try-ing service in steam production, develop almost an unendingnumber and variety of defects. When a boiler is new and first set up it is supposed to be clean,inside and out, but even one days service changes its condit
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsteamen, bookyear1917
