. Railway mechanical engineer . sectional expander. Fig. 4. Tightening Front End of Tubes—Next tighten the frontend of the tube with a standard roller expander, Fig. 5. Flaring Tubes, Preparatory to Beading—The firebox endof all tubes, and on superheater engines the front endsof the two rows of tubes just below the superheater flues andall tubes above these two rows, should be opened with aflaring tool, Fig. 6. Use a long stroke pneumatic hammer. Expanding with Lipped Sectional Expander—Expand thefirebox ends of the tubes with the lipped sectional expandersho\Mi in Fig. 7. Drive the expander p
. Railway mechanical engineer . sectional expander. Fig. 4. Tightening Front End of Tubes—Next tighten the frontend of the tube with a standard roller expander, Fig. 5. Flaring Tubes, Preparatory to Beading—The firebox endof all tubes, and on superheater engines the front endsof the two rows of tubes just below the superheater flues andall tubes above these two rows, should be opened with aflaring tool, Fig. 6. Use a long stroke pneumatic hammer. Expanding with Lipped Sectional Expander—Expand thefirebox ends of the tubes with the lipped sectional expandersho\Mi in Fig. 7. Drive the expander pin lightly until it is fairly solid. Draw out the pin. Give the expander a turnequal to half a section of the expander. Drive the pin asecond time. Withdraw it, and turn the expander a distanceequal to one-quarter of a section. Drive the pin a third should be exercised in the use of the expander in theouter rows of tubes near the heel of the flange to avoidcracking the sheet. Use a long stroke Boyer No. 60 pneu-. Fig. 5—Rolling the Tube in the Front Tube Sheet matic hammer (a heavier hammer is not recommended) indriving the pin or its equivalent. Inspection fen SpUt Tubes—After expanding, examine thetubes carefully. Those which have split in the shoulderformed by the lip of the expander, and tubes that haveopened from the end back to the sheet, should be removedand replaced before beading. Opening Front End of Tubes—If the front end of thetube has not been opened hot before placing in the boiler,a straight sectional expander should be used to tighten thetube in the sheet. The tube may then be rolled with astandard roller expander. If the finger type roller expander is used, the use of thestraight sectional expander is not required. Beading—Firebox ends of all tubes must be beaded, Fig 9.
Size: 2487px × 1004px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
