Sec. 14-3.18. Additional acceptable repair methods

Repairs and repair methods not covered in this chapter may be used if acceptable to the inspector. Additional methods illustrated in Figures 14-3.19-1 and 14-3.19-2 are acceptable if performed as specified in the figures.

FIGURE 14-3.19(1) ACCEPTABLE REPAIRS FOR CORRODED OR WORN HEADS OF VERTICAL TUBE OR SIMILAR TYPE BOILERS

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1. Flush Butt Welded Head

 

With this repair, the old head shall be cut close to the point of tangency of the knuckle of the flange, and the new head, previously drilled for tube holes and beveled for adequate welding groove, shall be but welded to the flanged session of the old head. A back up ring, inserted in sections if necessary, shall be used to ensure weld penetration for the full head thickness.

2. Lapped and Fillet Welded Head

 

With this repair, the new head shall be lapped under the flange knuckle of the old head, previously slotted as shown to admit the new head, and then fillet welded at the edge.

3. Segmental or Pie-Shaped Butt Welded Patch

FIGURE 14-3.19(2) ACCEPTABLE FURNACE RENEWAL

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Longitudinal seam in furnace double butt-welded and thermally stress-relieved

For repair, the final joint to each head may be stress-relieved by peening. The furnace may be welded into a riveted boiler by using adaptable end closures. Ringed furnaces shall be thermally stress-relieved after longitudinal seam and rings have been applied.