Why shouldn't you solder a water coil?

Why shouldn't you solder a water coil?

PostBy: JJLL On: Thu Jan 24, 2008 5:54 pm

As the topic says, why shouldn't you solder a few copper pipes together to make one long water coil inside a stove?

Solder melts at between 360 to 370 °F, if you have water constantly running through it, your water would boil before the solder would start to give. Is it that people are just afraid to do it in fear of a leak? I've been thinking about this and would like some opinions/ideas.
JJLL
 
Hand Fed Coal Boiler: Harman SF-360 Boiler

Re: Why shouldn't you solder a water coil?

PostBy: WNY On: Thu Jan 24, 2008 6:47 pm

Yes, the inside of the stove can get quite hot and with the water under pressure, the solder joints could fail over time.
I wouldn't want to try it. I wouldn't want my water line leaking in my stove, especially if I am not home, it could be a real disaster! and with the stove being semi-tight, it could fill up with water.... :)

You can probably get custom coils made to almost any size/length...
WNY
 
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
Stove/Furnace Make: Keystoker, LL & CoalTrol
Stove/Furnace Model: 90K, Hyfire I, VF3000 Soon

Re: Why shouldn't you solder a water coil?

PostBy: LsFarm On: Thu Jan 24, 2008 6:55 pm

The copper pipe is thin walled, the melting [yield point] is low. Solder is even lower... If the loop ran dry or boiled, you would have a leak almost immediately.

You could give it a try, but install some kind of automatic water-check-valve so that if it leaks, it won't turn your stove into an aquarium !!

Greg L
LsFarm
 
Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
Baseburners & Antiques: Keystone 11, Art Garland


Re: Why shouldn't you solder a water coil?

PostBy: Richard S. On: Thu Jan 24, 2008 6:56 pm

Why not just use the flexible copper tubing? :idea:

Or is that more susceptible to melting?
Richard S.
 
Stoker Coal Boiler: Van Wert VA1200
Coal Size/Type: Buckwheat/Anthracite

Re: Why shouldn't you solder a water coil?

PostBy: Dallas On: Thu Jan 24, 2008 7:24 pm

"Coal and copper" ... not a good combination. The coal produces sulfuric acid, which eats the copper up.


Use the copper on the outside of the stove or stainless steel on the inside.
Last edited by Richard S. on Wed Dec 18, 2013 7:16 am, edited 1 time in total.
Reason: <removed dead link>
Dallas
 
Hand Fed Coal Stove: Modified Russo C-35
Other Heating: Oil Hot Air
Stove/Furnace Make: Russo
Stove/Furnace Model: Modified C-35

Re: Why shouldn't you solder a water coil?

PostBy: JJLL On: Fri Jan 25, 2008 8:41 am

Wow, thanks for the information! I guess I'll stick with my schedule 40 pipe :)

Again, thanks!
JJLL
 
Hand Fed Coal Boiler: Harman SF-360 Boiler

Re: Why shouldn't you solder a water coil?

PostBy: Cap On: Sat Jan 26, 2008 8:52 pm

Silver braze it.
Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator