Impressive job !
From what I understand, the tube sheet will be two pieces welded together.
I'm not sure this is allowed here in France.
I will ask our boiler inspector in January about that, just for information.
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Sebastien
SNCF passenger trains engineer
Volunteer on the "Chemin de Fer de Rillé" (60cm/2ft, France)
www.aecfm.fr
cfrtrain.blogspot.fr