Supporting > Boilers
A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
Vixen:
--- Quote from: simplyloco on February 22, 2024, 05:08:15 PM ---End Cap and Smoke Box.
I've been busy today...😍
End cap from 1/4" alloy plate. It was rebated to a snug fit. I'll use the hole for a 3mm stay. It will hold the two ends together.
I just have to clad the sides of the box and the thing is finished apart from the water gauge and super heater.😍
--- End quote ---
Would that be a alloy steel or an aluminium alloy? Aluminium alloys have a melting point between 500*c and 600*C which is roughly 1/3 the temperature of a propane burner flame. So I assume you are using an alloy steel for the end cap and smoke box. I would have thought copper or mild steel would have been adequate.
simplyloco:
--- Quote from: Vixen on February 22, 2024, 05:42:58 PM ---
--- Quote from: simplyloco on February 22, 2024, 05:08:15 PM ---End Cap and Smoke Box.
I've been busy today...😍
End cap from 1/4" alloy plate. It was rebated to a snug fit. I'll use the hole for a 3mm stay. It will hold the two ends together.
I just have to clad the sides of the box and the thing is finished apart from the water gauge and super heater.😍
--- End quote ---
Would that be a steel alloy or an aluminium alloy? Aluminium alloys have a melting point between 500*c and 600*C which is roughly 1/3 the temperature of a propane burner flame. So I assume you are using an alloy steel for the end cap and smoke box. I would have thought copper or mild steel would have been adequate.
--- End quote ---
Hi Mike
Thanks for that. It didn't even cross my mind. I just had the material lying around and it would be easier to hang the cladding on the plate edges.
I could clad them with the foil backed 6mm ceramic fibre I have and see what happens!
crueby:
Mixing metals on the boiler shell? Not sure thats a good idea, differnt coefficients of expansion, electrolysis effects, etc.
Jasonb:
Plenty of model traction engines running around with aluminium chimneys that would see hot flue gasses
Would the gas burners flame even reach as far as the blanking plate on the return end?
If you are running off a propane/butane mix then the flame could be cooler than pure propane
crueby:
--- Quote from: Jasonb on February 22, 2024, 06:51:39 PM ---Plenty of model traction engines running around with aluminium chimneys that would see hot flue gasses
Would the gas burners flame even reach as far as the blanking plate on the return end?
If you are running off a propane/butane mix then the flame will be a lot cooler than pure propane
--- End quote ---
The first picture appeared to show a steel or aluminum (I couldnt tell) end plate on the end of the shell itself, not on the end of the smokebox? That doesn't seem like a good idea to me since it would be taking direct pressure from the boiler, expanding/contracting differently than the copper shell and tube.
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