FIG.1 Illustrating Boiler Front Head Repairs.
1340 Book Tower Engineering Department Detroit 26, Michigan
The repair outlined in this issue is not too costly and should grant a few years reprieve to a lot of engines that would have to be otherwise scrapped due to corrosion and wasting away of the lower section of the front head tube sheet and riveted flange. This repair ellminates the costly flanging. tube and stay rod replacement incident to full front head replacement However, we would recommend that a competent boiler maker be employed to do this work as, welding, riveting and caulking operations are Involved.
To make this repair, proceed' as follows: Either burn or drill out the rivets in the wasted section of the front head flange, then burn away the corroded section of the front head below the tubes, including the wasted flange in which the rivets have been removed. With all the metal out of the way, fit a sheet section of bar iron in place of the flange Fig. 1. Drill the rivet holes approximately one-eighth inch undersize and bolt the new flange securely with machine bolts. The next step is to cut out a piece of boiler plate Fig. No. 2, of the same thickness as the original head. Fit this section in place behind the bar iron flange. Next complete the welding as outlined in detail No. 1 using an electric arc and a Fleetweld No. 5 electrode.
After all welding is completed, the riveting of the flange can be started. Remove only one machine bolt at a time and drill and ream each hole before riveting. The holes should be reamed approximately one-sixteenth inch over the diameter of the rivet. shank. On completion of this work the bonier should be filled with water and given a hydrostatic pressure test of 1 and a quarter times the working pressure for which the boiler was originally designed.