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A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE

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simplyloco:
A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE #1

I constructed this boiler several years ago, intending it for a large model steam launch. On shell testing it at the time it held 100 psi but not more due to two tiny stay end leaks. I wanted at least 150, so I discarded it and got on with something else!
However, circumstances have changed, i.e. I'm too lazy to make another boiler, so I dragged this one out of retirement and fixed the little leaks by the judicial application of Loctite 648 drawn into the warmed boiler by my trusty workshop vacuum cleaner! It now holds nearly 200 psi so it's quite safe to run at 125 psi. I'll put a big superheater coil at the rear. You will note that this boiler has thicker tubes...😉

crueby:
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?

simplyloco:

--- Quote from: crueby on February 21, 2024, 07:30:00 PM ---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 quote ---
Not personally, but I know of one case where the 648 was applied to a superheated 5" loco and it is still running several years later!
John

baz:
I can confirm the efficacy of Loctite 648 on a boiler, I know of a 2 inch traction engine that had a leak around the fire hole, an application of 648 cured it and has never given any trouble in the last twenty years.

simplyloco:
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.😍

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