. Railway mechanical engineer . distance between plates is allowed;and that the material is of the best quality in order to securesatisfactory results. Numerous boiler patches that have come under my obser-vation gave good results, but I have also seen patches whichshould have been condemned. The New York state code andrules of the A. S. M. E. Boiler Code Committee specificallystate that any surface welded on boilers must be supported,or in case the boiler is repaired by patching, stays must pro-ject through a patch before it can be welded. The satisfac-tory welding of patches may be obtained
. Railway mechanical engineer . distance between plates is allowed;and that the material is of the best quality in order to securesatisfactory results. Numerous boiler patches that have come under my obser-vation gave good results, but I have also seen patches whichshould have been condemned. The New York state code andrules of the A. S. M. E. Boiler Code Committee specificallystate that any surface welded on boilers must be supported,or in case the boiler is repaired by patching, stays must pro-ject through a patch before it can be welded. The satisfac-tory welding of patches may be obtained by cutting out thepatched portion, beveling the edge to 45 deg. and also theedge of the new patch to be applied. The patch is put inplace, its size being such that a distance of 5/32 in. is pro-vided between the sheet and the patch. Also, the rows ofstaybolts adjoining the patch are cut out to aid in to prevent leaky bolts which would occur after the patchwas welded in place. Unless this precaution is taken, new-. Method of Repairing Boiier With Long Vertical Cracl< Due toFreezing cracks are almost sure to develop owing to the lack of pro-vision for expansion and contraction. A locomotive was recently sent to a repair shop for lightrunning repairs, and after standing outside the shop for fourdays was finally brought in for repairs. It was then discov-ered that the water had not been drained from the boiler buthad frozen. The gang foreman ordered steam turned intothe boiler after the dome cap and hand hole plates were re-moved as far as possible. As the boilermaker who was cut-ting flues at the time heard a loud snap he investigated andfound the right side sheet had developed a crack 53 in. long. This crack extended vertically from a place just above themud ring upwards nearly to the crown sheet flange as shownin the drawing. The stays were % in. and 1 in. in diameterand had a pitch of 3 13/16 in. Repairs were made by cut-ting out the cracked portion including t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
