Supporting > Boilers
A SCOTCH MARINE BOILER FOR MY TRIPLE EXPANSION ENGINE
Jasonb:
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
crueby:
--- Quote from: Jasonb on February 22, 2024, 07:32:06 PM ---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
--- End quote ---
I'm not as concerned about melting as much as cracking around the solder from the different expansions as it heats/cools. I'm no expert on it, just never seen those metals mixed in a boiler before. Usually see all copper, or all steel, that sort of thing. Would it meet code anywhere? Just passing a single static test would not convince me. As I say, I'm no expert on this, just concerned!
Jasonb:
As it's not part of the pressure vessel I don't think it would come under code.
It is also a fair way from the tube plate so unlikely to affect the joint
crueby:
But thats my point, in the first picture in Reply 5 it sure looks like its the end cap at the burner end, part of the pressure vessel, NOT the smokebox end where its just a cover. If I'm wrong on that, ignore the concern since the smokebox door is not structural. But, if its the other end, then it most defintely is pressurized.
Jasonb:
Flame goes in the end where the tube plate is nearest the end of the main tube, the deeper "void" at the other end being closed with the plate is where it changes direction and returns through the smaller tubes and is collected in the angled smoke box and up the brass chimney
The copper endplates form the pressure vessle the aluminium is not under any pressure just stopping the flue gasses going straight out the opposite end to the burner and then directing the returned gas up the chimney
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