corrosion at fittings where copper contacts black iron???

corrosion at fittings where copper contacts black iron???

PostBy: Fran654 On: Fri Sep 21, 2012 10:06 pm

hello all, hooked my boiler up last year , now its gettin cool and we are talkin about heat for the winter,,, a steam fitter on the job and another mason told me that you cant put copper to black iron ,or steel/ said elecltrolisis wil happen and corrod the fittings, the fitter said i should put and electostat ????? union in .. basically a steel nipple out of the boiler then this special union then tne copper pipe..now is this that serious to worry, and change my set up or not... to change my plumbig i have to shut down , runnin an aa130 24/7 year round ... your t5houghts are apprecieted thank you , tommy i guess i need to know if this corrosion will blow out the fittings in 1 year or 20 yrs????
Last edited by Fran654 on Fri Sep 21, 2012 10:17 pm, edited 1 time in total.
Fran654
 
Stove/Furnace Make: US Stove
Stove/Furnace Model: 6100M

Re: corrosion at fittings where copper contacts black iron???

PostBy: carlherrnstein On: Fri Sep 21, 2012 10:12 pm

You pretty much answered your question.
carlherrnstein
 
Hot Air Coal Stoker Stove: combustioneer model 77B
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Re: corrosion at fittings where copper contacts black iron???

PostBy: jim d On: Fri Sep 21, 2012 11:48 pm

that is a bunch of bullcrap 1st of all it's called a dielectric union , 2nd the only places we ever used them was on gov. & large prevailling wage jobs where a mecanical engineer did the plans &specks , if you ggo into any celler , basement or residential boiler room churches ect. you will find c x m adpts screwed into b/m & ci fittings and they will outlast the boiler AMEN nuff said jim
jim d
 
Stove/Furnace Make: alaska//coaljck
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Re: corrosion at fittings where copper contacts black iron???

PostBy: coaledsweat On: Sat Sep 22, 2012 7:49 am

Unless you are operating your boiler submerged in seawater, I wouldn't worry about it.
coaledsweat
 
Stoker Coal Boiler: Axeman Anderson 260M
Coal Size/Type: Pea

Re: corrosion at fittings where copper contacts black iron???

PostBy: steamup On: Sun Sep 23, 2012 12:54 pm

Corrosion occurs when oxygen is present in the fluid. On a sealed hydronic heating system there should be no problem with electrolysis. If you had a domestic water system, where there is a constant supply of fresh water, then di-electric unions should be used between iron and copper pipes.
steamup
 
Stoker Coal Boiler: Axeman-Anderson AA-130, Keystoker K-6
Hand Fed Coal Boiler: HS Tarm 502 Wood/Coal/Oil
Coal Size/Type: pea, buck, rice

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