Today the superheater plumbing was finished off, and the union nut made. Various bits of copper tube was cut and machined to the exact length. The tee piece was silver soldered first, then cleaned up to ensure the nut still turns on the tail, and the remaining superheater joints were silver soldered vertically in the vice as an assembly.
While things were in the acid, a snifting valve was made to suit a 5/32" stainless ball, and a bulkhead style connection through the front of the smokebox floor. As you can see there's not much clearance for the snifter but just enough! All the tubes are unobstructed with the plumbing which facilitates an easy clean with the tube brush.
An assembly check was done to prove the dart on the smokebox door and crossbar don't foul the new bits, which has enough room to get at things, turn a spanner, and get the crossbar in and out.
Happy steaming!
Nigel
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