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Dave Jones 107/10/2020 21:49:50
85 forum posts
5 photos

Evening all,

I am just about to start making 2 superheaters for a Juliet boiler and I have a few questions as I have not made one of these before. I have a couple of gunmetal castings for the end of the superheater, these are the usual lozenge shape. I can’t for the life of me work out how they form the end of the superheater element that the copper tubes fit into. Does anyone have a photos that shows how a superheater is made from these castings.

The second questions is that in the construction notes, LSBC calls for these joints to be ‘brazed’. I haven’t tried brazing before as everything I have made bas used silver solder. Will a sievert propane set got hold enough for brazing? Or do I need to find something with a bit more heat? Does it have to be brazed or will silver soldering suffice?

Tomek07/10/2020 22:40:24
46 forum posts
25 photos

Hi Dave

In Juliet notes sifbronze no1 is recommended for brazing superheater return bends. It's got higher melting point than a silver solder and you should be able to do it with sievert torch.

John Baguley08/10/2020 13:06:19
503 forum posts
54 photos

Hi Dave,

Are they the castings from GLR? If so, I would guess that you are supposed to cut them in half acoss the shortest width, each 'lozenge' shape making two return bends, and then drill the cut surface for the elements?

I've always used Silverflo24 for soldering the return bends and have had no problems with the joints melting in use. I've now got some Silverflo20 which would probably be better and I will use that in future. My superheaters are always the stainless steel radiant type where they extend to the back the firebox so will get much hotter than the LBSC type that are only in the superheater flue. Once soldered, it takes a lot more heat to remelt the joint than needed to make the joint.


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