I have spent an unhealthy amount of time trying to source one of these, I am being a picky bastard, and maybe I'm using the wrong search terms but all I can find are custom fab shops.
I would like a single 3/4" hard copper coil ~10+ feet long spiraled with a max outside diameter of 8".
There are counter flow chillers from the beer industry that have minimum distortion at this radius with larger then 3/4".
Find something that is sturdy 6" round. Put it in an open area where you can walk in circle's. Buy a 10' copper pipe, pinch the end fill with dry sand pinch the other end. Secure one end to your cylinder lean outwards and walk in a circle. It took less then 20 min total to make my coil by myself.
Or order one from AliExpress and wait 3 weeks.
Tōtō
Tōtōchtin wrote: ↑Tue Jul 23, 2024 8:15 am
Find something that is sturdy 6" round. Put it in an open area where you can walk in circle's. Buy a 10' copper pipe, pinch the end fill with dry sand pinch the other end. Secure one end to your cylinder lean outwards and walk in a circle. It took less then 20 min total to make my coil by myself.
Or order one from AliExpress and wait 3 weeks.
Tōtō
I've done 3/8 and 1/2". I didn't see that the 1/2" was more difficult just a bit slower as getting the coils spaced out well. 2 people would not have been slower.
3/4" would be more difficult for me but I have two broken wrists. Two people with one of them over 200 lb I don't see as a problem, just lean out and walk slowly around. I used a 4" steel pipe that was filled with cement to protect a propane tank for the 1/2", no kinks or flatten spots. I didn't anneal the pipe either. If you had someone with a torch by the cylinder your bending on preheating it I think it would be no problem. The hard part is finding a sturdy object to wrap around.
Here I would go to a used scrap yard and rent a 6" pipe, use it and return the pipe.
As you can see I'm a cheap bastard with more time then money.
Tōtō
Tōtōchtin wrote: ↑Tue Jul 23, 2024 8:15 am
Find something that is sturdy 6" round. Put it in an open area where you can walk in circle's. Buy a 10' copper pipe, pinch the end fill with dry sand pinch the other end. Secure one end to your cylinder lean outwards and walk in a circle. It took less then 20 min total to make my coil by myself.
Or order one from AliExpress and wait 3 weeks.
Tōtō
Using 3/4"?
You don' want to use hard copper tube to do this. You need soft ACR copper sold in rolls.
If you have a shop that builds dune buggies, they would have a tubing bender for small pipe.
Copper is very forgiving if you take your time and have a plan.
Me I have a bunch of parts I've made but no gumption to put them together.
If I remember right the largest I have noticed on AliExpress is 1/2".
This is a good place for parts https://www.coppertubingsales.com/colle ... -x-50-ft-1
Tōtō
This is what happens without a plan, but watch it so you do better.
Tōtō
If money isn't a problem look for people who make heat exchangers.
AliExpress price 5 m without shipping in peso's about 115 bucks.
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Last edited by Tōtōchtin on Tue Jul 23, 2024 9:44 am, edited 2 times in total.
acfixer69 wrote: ↑Tue Jul 23, 2024 9:09 am
You don' want to use hard copper tube to do this. You need soft ACR copper sold in rolls.
Definitely need soft tubing.
3/4" hard tubing is much cheaper than soft ACR.
I'm a tight wad when spending money, I'd build a fire and anneal the 3/4" ID
shadylane wrote: ↑Tue Jul 23, 2024 1:17 pm
Just out of curiosity, what is the coil going to be used for?
Is it a worm, wortchiller or are you building a monotube steam boiler.
Steam coil. Not sure I've heard the term monotube before.
It's the boiler design that's least likely to go Boom.
A mono tube boiler is just that, a long coiled up tube that fire blows on.
It's commonly used on steam cleaners.
