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The pattern I have seen with the Weil Mclain LGB steamers, which seem very sensitive to welded headers, is that boilers with welded offset 2 riser headers last about 14 years. Failure mode is almost always leaks between the sections at the seals. Boilers installed with 2 threaded risers and headers or smaller single risers sizes last about 24 years. I consider a 14 year life unacceptable and only the rich can afford the cheaper welded installations. On large boilers we use a welded header but with threaded drop risers, which allows all sorts of expansion and contraction. Also, the header drain and return going back into the boiler needs to be threaded in order to make this corrosion prone piping easier to replace in the future without the huge set up fee for a certified welder. Many installation diagrams also show required threaded joints here also so expansion and contraction of the piping doesn't stress the castings.