. American engineer . VOMINAI. OI/TSIOC OIAMCTCI^OF PI_OC. Fig. 3—Preparation of Holes in Front Flue Sheet. flue sheets, using a pneumatic flue cutting-ofif machine of ap-proved design. When renewing a partial or complete set offiues, the diy pipe not being removed, the flues must be cutoff at the front end, preferably with a pneumatic flue cutting-oft machine, and the beads at the back flue sheet should becut off with a thin flat chisel, and the flues be backed outthrough their own holes in the front flue sheet, if possible. Ifnot, through a flue hole enlarged ]4, il in diameter, located near
. American engineer . VOMINAI. OI/TSIOC OIAMCTCI^OF PI_OC. Fig. 3—Preparation of Holes in Front Flue Sheet. flue sheets, using a pneumatic flue cutting-ofif machine of ap-proved design. When renewing a partial or complete set offiues, the diy pipe not being removed, the flues must be cutoff at the front end, preferably with a pneumatic flue cutting-oft machine, and the beads at the back flue sheet should becut off with a thin flat chisel, and the flues be backed outthrough their own holes in the front flue sheet, if possible. Ifnot, through a flue hole enlarged ]4, il in diameter, located nearthe center of the front flue sheet. Safe-Ends.—Safe-ends must be .135 in. thick, in lengths of 4in., 6 in., and 8 -in., of seamless steel tubing, and in accordancewith the specifications. One end of the safe-end must be COUNTER SUI»4KauP-p-IClENTL-V TO wcMove. SHARP* coeEia. BU-r fMOT rYioRe T-My\. g SrylA OUTSIDE OlArvlCTER OP- p-uue Fig. 4—Preparation of Holes in Back Flue Sheet. scarfed for a distance of J^ in., being tapered to 1/32 in. inthickness at the end of the scarfing and cut square on the op-posite end by the manufacturer, as per Fig. 1. A 4 in, safe-end must be used on all new flues, and when these flues requirerepairs a second 4 in. safe-end should be applied. The nexttime they require repairs the safe-end portion may be cut oftand longer safe-ends, 6 in. or 8 in. should be used in theirplaces, the object being to reduce the number of welds in theflues. Prc[<ariiig flues.—The firebox end of the flues should beheated and enlarged. Fig. 2 for the entrance of the scarfed safe-end, this being done by ramming on a standard taperedhorn. The safe-end should be placed in the end of the flue end,both should be heated to a white heat, drawn out quickly andbe welded on a flue welding machine, care being taken to seethat the weld is smoothly made. Not more than six weld
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1912
