Hi Ben! First off, excellent job on the books. I just bought print copies of both and I'm very impressed with your presentation.
One thing I noticed that seemed odd from the gasifier book - the condensate liner drain. It's noted in the layout on pg. 18, but later in pgs. 54-57, it doesn't appear to get installed with the tank dome section, condensate liner, or the top section of tank wall. I also see the condensate liner drain in the picture on the back cover of the book, and in the picture on pg 180. .... I've gone back and forth through the book several times searching for the installation of the condensate liner drain to no avail, but maybe i'm a dummy and somehow i've been looking right at it.
Related observation / question: that piece of tank dome section that gets covered on pgs 53-55, also looking at it in the layout diagram on pg 18, its top surface slopes inward and downward and the condensate liner gets set on top of it and welded water tight. In the diagram on pg. 18, it shows the condensate liner drain installed into the outer wall such that the bottom of the drain is even with the top of the tank dome section, which would leave a ring-shaped space below the drain. To me it looks like water would collect in that ring and would be unable to drain (see attached drawing). Perhaps there would be a way to flip the dank dome ring, or insert another ring, that slopes downward and outward and that is tilted slightly off the vertical axis toward the drain so that the drain exits that space at its lowest point?