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Never would have thought to try the 648, but it says its operating temperature range is up to 355F so as long as its not in the way of direct flame from the burner thats okay. Have you run a boiler with that before?
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.😍
Quote from: simplyloco on February 22, 2024, 05:08:15 PMEnd 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.😍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.
Plenty of model traction engines running around with aluminium chimneys that would see hot flue gassesWould 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
Yes I took it a sAluminium at both ends, and agree that too snug a fit may cause problems with expansion and depending on the amount of use galvanic attack could be an issue.But regarding heat the plates are a bit like the 648 will they see direct heat ?and if so what flame temperature and more importantly material temp, a typical air/propane torch may only give 750degC temp in the components and that is with the flame directly applied