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Thread: Copper Tube
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30th Sep 2019, 10:09 AM #1New Member
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Copper Tube
Hi All,
I am building a model steam engine and am chasing a piece of copper tube approx. 2.5inch dia x 8 inches long, to make the boiler. Help would be much appreciated.
Thanks
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30th Sep 2019, 02:31 PM #2
You can get it from plumbing supplies, but you will need to buy a full length of it... or get friendly with a commercial plumber and ask for an off cut
https://www.grainger.com/category/pl...&filters=attrs....................................................................
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1st Oct 2019, 07:36 AM #3Most Valued Member
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Would this be of any use?
Approx 40mm diam, 125mm long on the plain section. Tubes are just over 11mm OD.
I have a couple here that were destined for the scrappie.
Steve
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1st Oct 2019, 11:10 AM #4New Member
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1st Oct 2019, 04:29 PM #5China
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A few years ago a mate of mine used an old fire extinguisher body, the type they had on buses in days gone buy, picked it up for $5 at a second shop
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1st Oct 2019, 07:14 PM #6Senior Member
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You could try a scrap metal dealer. Should be one close by. They usually end up with the short lengths of new pipe when a plumber cleans out the van.
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1st Oct 2019, 07:35 PM #7Novice
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A scrap dealer would be a good idea I think. A sprinkler fitter would use plenty of larger diameter pipe also. It might be worth a phone call to a fire services business to ask them if you could buy a small piece off them.
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1st Oct 2019, 09:10 PM #8Most Valued Member
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That size wouldn't be in the range of a general plumber, unless it's someone who does Fire sprinkler systems. I doubt even Refrigeration blokes would use that size.
KrynTo grow old is mandatory, growing up is optional.
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2nd Oct 2019, 12:42 AM #9China
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You could also make one using a swage block then rivet and silver solder the seam
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3rd Oct 2019, 02:12 AM #10
A long run for gas supply can get to that size in an commercial environment plenty of industrial uses my work has runs of 4" for combustion air and 2" for the gas to feed the burners on our smaller pans/kettles but all of the bigger pans use heavy wall steam pipe probably a cost thing I'd say.
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3rd Oct 2019, 08:32 AM #11Philomath in training
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Any tube you get will only be thin wall. You may have to get some copper sheet, roll it and then solder a strip of copper across the join to make it a lap joint.
Thought - have you contacted a model engineering club in the area? They may have a member who has something suitable. The other thing is that boilers for models are covered by a standard so they should be able to advise on how thick it should be and any things that are prohibited as a construction method. Given the pressures involved and the consequences of failure, worth checking.
Michael
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3rd Oct 2019, 11:45 AM #12
I can give you a choice of sizes.
These sizes are close but not exact. Where they are, they are awkward to measure.
OD = 60mm Wall thickness appears to be +3mm (could be some burring on edge)
OD = 64mm Wall thickness around 1.7mm.
Michael has raised the idea of model engineering society near you. He has also raised the issue of boiler safety.
If you are not already aware there is a magazine "Australian Model Engineering"
https://www.ameng.com.au/main.htm
They have a club listing and under their shop tab sell various miniature boiler code books.
Let me know if this is of interest.
Findlay.
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6th Oct 2019, 04:48 PM #13Most Valued Member
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Ummm
Would 70 mm od do?
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10th Oct 2019, 09:25 AM #14Most Valued Member
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