Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . ure 178Crown stay with nut and washer. ?ST STECL NUT^ 1%OVER FLATSThe Derry Collard Co. make the joint tight while the end of the stay bolt isriveted over against the nut, after the nut has been driveninto place. Usually the two rows in front of crown staysare made flexible. One style is shown in Fig. 179, theidea being to allow the crown sheet to bend up as the tubesheet expands. As this tube sheet is usually straight,the expansion is a thrust against the crown stays and if 206 Sling stays.
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . ure 178Crown stay with nut and washer. ?ST STECL NUT^ 1%OVER FLATSThe Derry Collard Co. make the joint tight while the end of the stay bolt isriveted over against the nut, after the nut has been driveninto place. Usually the two rows in front of crown staysare made flexible. One style is shown in Fig. 179, theidea being to allow the crown sheet to bend up as the tubesheet expands. As this tube sheet is usually straight,the expansion is a thrust against the crown stays and if 206 Sling stays. these stays were solid, the crown sheet would be bentdown immediately back of the tube sheet. This bendingaction would open up the seam and cause it to leak atthis point. If we have a sling stay, however, Fig. 179,the crown is not prevented from rising and this defect isdone away with. Fig. 180 represents a detail of one of these slingstays. The lower portion is secured to the crown sheetby tapping E into the sheet and then screwing the nutin against a copper gasket C. A similar piece is screwed. Tho Derry Collard Co. Figure 179Sling stays in place. in at F, and in this case is riveted over on the outside. Bis a reamed bolt so as to make a snug fit. The straps Lhave elongated holes on the top to allow for style of sling stay is frequently used over a greatpart of the crown. Where the stays are not radial to the 207 Sling stay details. -£-: msm t. t 9^ 3- \F UL_L_^. ^^ Figure 180One form of sling stay. The Berry Collar* Co. crown sheet, they must be riveted over inside instead ofhaving a nut as indicated. Fig. 181 shows another style of sling stay. It con-sists of two T irons, one on top A and the other B,placed a distance above the crown sheet so as to admitof a free circulation of water. The bolts H are drawnup tight against the ferrules T. The bolts are made ofsteel and are turned to the exact size from hexagonalstock, on a screw machine. The holes to receive
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
