Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . e iron pipes seem to give satis-faction in everv wav. Riveted Parts. In Fig. 229 we see a lapped seam with three rowsof rivets R, and staggered between these are three rows 5-0 0 O O O ; 0 0 0 O O .__ _^ Q < 0 0 O O O i 0 0 0 O O R n n O O 0 0 O O O O <p jcp 1 Figure 229Lapped seam. o o o The Derry Colla~d C«.\ of stay bolt. This is a style of seam which we fre-quently meet on the outside crown sheet, somewherealong the top sides. The seam is made wide at A, so asto admit of an extra r
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . e iron pipes seem to give satis-faction in everv wav. Riveted Parts. In Fig. 229 we see a lapped seam with three rowsof rivets R, and staggered between these are three rows 5-0 0 O O O ; 0 0 0 O O .__ _^ Q < 0 0 O O O i 0 0 0 O O R n n O O 0 0 O O O O <p jcp 1 Figure 229Lapped seam. o o o The Derry Colla~d C«.\ of stay bolt. This is a style of seam which we fre-quently meet on the outside crown sheet, somewherealong the top sides. The seam is made wide at A, so asto admit of an extra row of bolts as shown. Care must 246 Butt seams. be taken in the laying out and machining of this sheet, onaccount of the rivet B which comes about on a line withthe edge of the sheet. The sheet is bulged out at thispoint and for this reason we can order a sheet this muchlonger and then trim the metal away on the inside of thesheet. However, this allowance is not necessary as it isdrawn out at this point, wedge shape so as to fit snuglyto the sheet underneath. 0 ?1 Br—i 1 ~ r Y ?! \ T VI j( m. 15,6 RIVETS 1 HOLES i I „,, ,. I ,.. I _J, L V~ -3V2- - »f«—1-3I/2- -*^-3% . P^ Jr^-3-72—^—31/ ivU_jmj_i-i-i_r-i-J4.^^iu<h % Figure 230 *»« ^eny CWfczrd Co. ^ Butt seam with welt. Fig. 230 illustrates a butt seam with outside and in-side welt strips. This style of seam is very common onlocomotive boilers. This seam is not welded at W, andfor this reason a stud S is placed in the seam between theoutside sheet and the welt strip. The space between thesesheets is only made wide enough to allow calking thesheet. The outside welt strip is always narrower thanthe inside and is alwavs thicker. This is not only correct 247 Steam connections. for strength, but for calking. A thin sheet with rivetsas far apart as here indicated cannot be calked of the connections for the injector check, blow
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
