Now that clamping method for silver soldering was inspired! And the Olives! what a great video.. I am healing currently. my loco nearly took my index finger off. be careful everyone.
Full size practice says the firebox area is the worst place to inject cold feed water. IDK about you guys across the pond but we Yanks inject water almost up by the front tube sheet. Not sure running both feeds through one feed is legit, if the fitting plugs you don’t have a backup. Might be something you get called out on, not sure what UK miniature boiler code calls out. Big stuff, def not. Cheers.
I see what you’re saying, but the regs call for two boiler feeds, not three, so as long as there is one other completely independent feed I’m happy (which there is). It is something worth considering though…
Most interesting point you raise about the location of feed water entry. LBSC the old designer, detested backhead clackboxes, I assume because of thermal shock to the firebox. His preferred location was a prototypical one up by the front tube plate. So many designs now have backhead admission. I wonder if it really matters now.
I think scale factor saves the day. The mechanical principles are still the same, the effect is not as drastic. I am a bit curious as the whether or not feed water location affects steaming on a small boiler.
@@andrewfayers9147 it is an interesting discussion, the full size of these originally fed the water into the side in front of the tanks, but that was changed to the backhead. From a thermal shock point of view it possibly should go near the front, but from a steaming point of view it may be better if it’s going in at the firebox. I am not a fan of clacks at the foundation ring though.
Great tip on using olives to allow larger bore pipe on smaller fittings
Now that clamping method for silver soldering was inspired!
And the Olives! what a great video..
I am healing currently. my loco nearly took my index finger off. be careful everyone.
Interesting video 👍
Full size practice says the firebox area is the worst place to inject cold feed water.
IDK about you guys across the pond but we Yanks inject water almost up by the front tube sheet.
Not sure running both feeds through one feed is legit, if the fitting plugs you don’t have a backup.
Might be something you get called out on, not sure what UK miniature boiler code calls out.
Big stuff, def not.
Cheers.
I see what you’re saying, but the regs call for two boiler feeds, not three, so as long as there is one other completely independent feed I’m happy (which there is). It is something worth considering though…
Most interesting point you raise about the location of feed water entry. LBSC the old designer, detested backhead clackboxes, I assume because of thermal shock to the firebox. His preferred location was a prototypical one up by the front tube plate.
So many designs now have backhead admission. I wonder if it really matters now.
I think scale factor saves the day.
The mechanical principles are still the same, the effect is not as drastic.
I am a bit curious as the whether or not feed water location affects steaming on a small boiler.
@@pvtimberfaller I suppose it must affect steaming, but as you point out, in a much reduced way, to full size practice.
@@andrewfayers9147 it is an interesting discussion, the full size of these originally fed the water into the side in front of the tanks, but that was changed to the backhead. From a thermal shock point of view it possibly should go near the front, but from a steaming point of view it may be better if it’s going in at the firebox. I am not a fan of clacks at the foundation ring though.
Boiler test code 2018. paragraph 6.5 "A single boiler inlet with two check valves is acceptable"