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Boston & Maine 3713 |
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The Restoration |
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Winter 2011 Update |
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The following photographs have been compiled by Mike Tillger for the Lackawanna and Wyoming Valley Chapter of the NRHS. This report details some of the work that has been completed as well as ongoing repairs. |
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| MUDRING REPAIRS |
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The mudring which supports the firebox was found to be in poor condition and required extensive repairs to the front and rear sections and new left and right sides were fabricated from new material. |
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Defects required extensive grinding to remove prior to welding. |
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End of old mudring ready to be prepped for welding to newly fabricated portion of mudring. |
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Using dye penetrant inspection techniques all of the crack is removed by grinding. The red dye highlights the crack's continuation, which requires further grinding. After the rest of the crack has been removed, the mudring will be welded and reprofiled back to its original shape. |
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New section of mudring attached by the root pass of the weld to the old mudring (on left). |
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Completed weld, ready for grinding. |
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FIREBOX REPAIRS |
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Firebox roof sheet was removed because the engineering no longer meets Federal Railroad Administration regulations. It will be replaced by a thicker sheet of steel. |
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Backhead exposed by removal of roof sheet. |
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Backhead exposed showing where the braces for the roof sheet attatch to the tee irons. |
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Section of the roof sheet that was removed from the firebox. |
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Large holes for flexible staybolts were added by the B&M Railroad. These holes effected the strength of the sheet negatively, requiring replacement of the sheet, . |
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Top front of roof sheet. This area has engineering issues adding to the decision to replace the entire roof sheet. |
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Throat sheet being tested for cracks using dye penetrant. A multitude of cracks were found radiating from the staybolt holes that support the syphons. The boiler survey showed that this area required a heavier liner to support this area against the boiler pressure. The center liner was removed to repair cracks in the sheet. |
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New liner being fitted to throat sheet, it still needs to have the holes for the staybolts and washout plugs added. The bolts are temporary and will be replaced by rivets for the final assembly. |
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Two reinforcing plates installed by B&M shops on water side of outer firebox sheet, about 80% of the staybolt holes exhibited radial cracks, which is a sign of metal fatigue. Along with the roof sheet, both outer (wrapper) side sheets will be replaced. |
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Newly fabricated door sheet having staybolt holes added. Item in lower right is one of 3 thermic syphons removed from the firebox. |
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Newly fabricated door sheet being test fitted to backhead. |
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| BOILER WORK |
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Looking from firebox end of boiler towards front tube sheet, boiler barrel has been sandblasted and painted with Apexior, a specialty coating for the interior of boilers. |
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Square reinforcing plate was added by B&M shop forces as a repair to cracks in boiler shell. This port originally was used as the inlet for the feedwater pump, which was later relocated to the hole in the top right, after the cracks increased in size. |
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After removing the reinforcing plate, further investigation revealed a total of 11 cracks in the feedwater inlet vicinity. This will be repaired by cutting out the old boiler shell and welding in a flush patch. The old hole for the inlet is not required account of the relocation shown in the earlier slide. |
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Steam dome has been removed to gain access to a crack in the 3rd course barrel sheet there are also 2 cracks in the dome liner reinforcing plate. Engineering has been performed to determine the cause of these 3 cracks before repairs can be started. |
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Steam dome is sitting upside down to allow for scale removal before being inspected for defects. |
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View from inside the boiler looking towards the rear of the steam dome opening showing the cracks in the barrel(main plate) and the liner. The B&M attempted to stop these cracks by drilling stop holes in the plate and adding a third layer of reinforcement, but the cracks continued growing larger. The crack in the main plate will be repaired by welding. The cracks in the liner will be repaired by replacing parts of the liner, but with a better supporting fit to the barrel. |
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SMOKEBOX REPAIRS |
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New liner installed in bottom of smokebox. |
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Newly installed steel for feedwater heater recess in smokebox. |
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Front tube sheet has been tested for cracks and thickness, all cracks have been repaired. |
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Top of smokebox which has been replaced due to thinning caused by cinder cutting and erosion. |
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| HOME |
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