. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . rewed, and substituting return bends in-tegral with the pipes of the unit, and fromthe same tubing with which the unit isconstructed. This was only made pos-sible by the use of improved material,the tubes now used being of low carbon,cold drawn, seamless steel. This bend-ing, and welding and thickening of theprojecting end of the superheater tube isa machine forging job throughout. Xoacetylene or electric welding is used inthis process, and yet the degree of skillin forming the part is such t
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . rewed, and substituting return bends in-tegral with the pipes of the unit, and fromthe same tubing with which the unit isconstructed. This was only made pos-sible by the use of improved material,the tubes now used being of low carbon,cold drawn, seamless steel. This bend-ing, and welding and thickening of theprojecting end of the superheater tube isa machine forging job throughout. Xoacetylene or electric welding is used inthis process, and yet the degree of skillin forming the part is such that the bendis not reduced in cross-section, and atthe same time the increase in size of thereturn bend as compared with that of tiiepipe is so slight that practically no addi-tional obstruction is presented to the flow the material, after which the ball endsare annealed and accurately turned in aturret lathe so that the finished surfaces,one forming a seat in the header and theother resting in the clamp, are true partsof the surface of a sphere 2Y% ins. in di-ameter. The ball joints are carefully. CUAMP Cl_AMP BOLT V/A3HEA FIG. 2.—UNIT PIPE ENDS SHOWING CONNECTIONS TO TIIE HEADER ground to this contour, the correctnessof the grinding being insured by spot-ting in gauges that are hardened andground to the precise segment of a 2 shows the improved method of con-necting the tubes to the header by meansof a clamp and a threaded bolt, withnuts passing through the header, and hold-ing two of the tubes in place. In case it is necessary that the old clamps be re-moved from the unit to prevent theirwearing holes in the pipes, the old clampsbeing readily removable by the applicationof a cold chisel. The washer, it will beobserved, is applied in a manner similarto that used in applying the gland forpiston rod packing and piston rods hav-ing enlarged ends; that is, the split ringon the inside of the washer is removedand the solid ring slipped over the solidend of the u
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Keywords: ., bookcentury1900, bookdecade1900, bookidrailwaylocom, bookyear1901
