. Railway age gazette . railroad friends, whohave more leisure than we, please answer the above query?—Editor.—From the Anurican Railroad Journal, March 7, 1835. BY N. H. AHSIUOLH The subject of crown sheet stays adjacent to tube sheetflanges, has been given much consideration in the past fewyears in an endeavor to correct existing defects in locomotivefireboxes. As a result of these defects, the renewal and patchingof tube sheets form very considerable items of expense in fireboxmaintenance. Having had extensive experience with nearlyevery type of crown sheet stay, the writer will endeavor to
. Railway age gazette . railroad friends, whohave more leisure than we, please answer the above query?—Editor.—From the Anurican Railroad Journal, March 7, 1835. BY N. H. AHSIUOLH The subject of crown sheet stays adjacent to tube sheetflanges, has been given much consideration in the past fewyears in an endeavor to correct existing defects in locomotivefireboxes. As a result of these defects, the renewal and patchingof tube sheets form very considerable items of expense in fireboxmaintenance. Having had extensive experience with nearlyevery type of crown sheet stay, the writer will endeavor to showwherein lie the weaknesses of each type, and suggest a methodof staying to eliminate tube sheet failures. First, considering the standard T bar construction as shownin Fig. 1, it is always found when necessary to remove T barsof this construction after a period of service of from four toeight years, that the bolts, bars and sling connections are all inone solid mass. Scale has formed around the slings and sup-. Fig. 1—Standard Crown Bars in Radial Stay Boilers porting bolts and nuts, making it very difficult to remove themfrom the boiler. This fact of scale formation will prove the ab-sence of flexibility, or any possible adjustment of this construc-tion to the various movements of the crown sheet due to tubesheet expansion and contraction. The deterioration of the topflanges of tube sheets is caused by the rigidity of T bar con-struction, which confines the resultant stresses set up by the ex-pansion of the tube sheet, to the short space between the top tubeholes and the center line of the first transverse row of crownsupporting bolts, as at C, Fig. 2. Where these stresses are dis-tributed over a wider area of the crown sheet the deteriorationof the tube sheet knuckles is not evident. At the highest point on the top tube sheet flange, which lies
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1913
