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| awemawson:
"Cerrobend" is the bees knees for pipe bending. An alloy of (I think) bismuth that melts at about 70 centigrade. Melt in a water bath, pour in, bend, melt out in a water bath. http://www.csalloys.com/products-cerrobend-alloy.html |
| tom osselton:
I was thinking of that too but haven't played with any yet. |
| tom osselton:
I thought you might find this interesting (at the bottom of the page) http://photos1.blogger.com/img/252/5340/640/DSCN0185.jpg http://steamprojects.blogspot.ca/ |
| vtsteam:
Thanks Tom. Not a monotube boiler but a vertical water tube boiler with external coils. Funny thing is the PM model boiler I'm making now in the other thread is a very simple horizontal version of the same thing. For occasional use like my model version, copper water tubes are usable. And in this specific case they are easily replaced since they are attached by screw fittings. But I do wonder how long lived they will be in a full sized marine boiler, due to oxidation. I think It will be important to control and reduce excess combustion air for the tubes to last well. |
| vtsteam:
So, returning here from the PM boiler experiment in another thread and having done it's first steam this afternoon , an interesting thing I saw today was that the copper coil under the main boiler barrel was glowing cherry red. How is that possible I'm wondering, if the barrel is full of water and the steam pressure is less than 20 PSI? Does that mean that there is no water in the coil (where it was red hot), just steam? I wish I had noticed how much of the coil was red, but I didn't. Is it completely empty of water, or is water crculating and being converted along its length into steam before reaching the red section? And would this mean it is acting like a separate monotube connected to the main boiler barrel? Is water traveling through the coil or just vapor locked out of it? Questions, questions.... |
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