Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . The Derry Collant Co. Another crown Stay bolt with nut. at right angles to the crown sheet, as the threads arestraight. A copper washer C is placed between it andthe sheet and when it is screwed tight into place it acts asa gasket to keep the joints steam tight. The square headH is used for screwing the bolt into place. Sometimes a stay bolt is allowed to pass through forsome distance and receive a nut, Fig. 178, instead ofbeing riveted over in the fire box, like Fig. 176. Acopper w
Locomotive boiler construction; a practical treatise for boilermakers, boiler users and inspectors .. . The Derry Collant Co. Another crown Stay bolt with nut. at right angles to the crown sheet, as the threads arestraight. A copper washer C is placed between it andthe sheet and when it is screwed tight into place it acts asa gasket to keep the joints steam tight. The square headH is used for screwing the bolt into place. Sometimes a stay bolt is allowed to pass through forsome distance and receive a nut, Fig. 178, instead ofbeing riveted over in the fire box, like Fig. 176. Acopper washer between the nut and the sheet serves to. COPPER WASHER DIA. RIVET OVER END Figure 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
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Keywords: ., bookcentury1900, bookdecade1910, bookidlocomotivebo, bookyear1912
