Sunday 6 November 2016

Concluding the day's posts: I needed to make a couple of 1" BSPP (G-thread) x 3/4" copper sweat adaptors that will form the ends of the heat exchanger tube and make the seal with the boiler plate. These are necessarily custom parts as this they adapt from European to North American standards. However, I think that is it reasonable to consider the HX tube as a non-serviceable i.e. a custom part.

Lead-free hex stock after threading, chamfering and cut-off operations.


























View from the other side showing the 90 degree included-angle internal chamfer that will seat and seal with the hemispherical "bi-cone" fitting.

























The part is flipped and bored to receive the 3/4 copper pipe.


























Test fit of the pipe.


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