Is electrolysis a issue with copper pipe and steel fasteners?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Kail, Mar 1, 2016.

  1. Kail

    Kail New Member

    Joined:
    Jan 23, 2016
    Location:
    Albany, Oregon
    I am running all pex in our home that I am plumbing but I have purchased all copper stub ells for coming out of the walls. The ells that I purchased have a 4 hole flange for nailing or screwing the ells to studs. I have always been told that steel and copper should not come in contact with each other because of the chemical reaction that occurs. Can I use steel screws or nails on these cooper flanges and ells or is that a big no no?
     
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Use copper nails and be safe...
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. craigpump

    craigpump In the Trades

    Joined:
    Apr 12, 2012
    Occupation:
    Self employed water system tech
    Location:
    Connecticut
    Don't combine dissimilar metals.
     
  5. hj

    hj Master Plumber

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    It is only a problem if they are in water.
     
    mliu, Kail and MASTERPLUMB777 like this.
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Condensation may mean wet pipes, regardless. Maybe not in the desert, but the humidity levels elsewhere in the country, at least in the summer, could be an issue. Depends on the construction and local conditions. Safest to not mix metals. Or, use a plastic clamp, then use whatever fastener you want on it.
     
  7. standardairconditioner

    standardairconditioner HVAC'ker

    Joined:
    Nov 27, 2015
    Location:
    Montreal, Canada
    Can't you use a smaller fitting on the part that sticks out on the wall, but you fasten it on the pex line?
     
    Last edited: Mar 2, 2016
  8. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Kail likes this.
  9. Kail

    Kail New Member

    Joined:
    Jan 23, 2016
    Location:
    Albany, Oregon
  10. standardairconditioner

    standardairconditioner HVAC'ker

    Joined:
    Nov 27, 2015
    Location:
    Montreal, Canada
    No.
     
  11. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    I think yes. I am not a plumber or other pro. I expect that if using steel fasteners was a problem in attaching one of these to your wood, there would be warnings.
     
  12. standardairconditioner

    standardairconditioner HVAC'ker

    Joined:
    Nov 27, 2015
    Location:
    Montreal, Canada
    I mean WORST case scenario, is that there may be some rot 10-20 years down the line around the holes of that mounting plate, and 90% sure that won't reach into the water supply ell.

    If this is contractor work, use whatever screws you have on the truck or in your pockets.

    But if this is your own home, do whatever lets you sleep at night.

    Copper nails and brass wood screws are really not expensive nor hard to time.
     
    Kail likes this.
  13. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    Two different metals surrounded by an electrolyte create a battery. Moisture can become an electrolyte. If it never gets wet, as has already been stated, it won't be a problem. I would guess you know what an old battery can look like...it may take years, but they can look nasty and things corrode. A cold pipe can sweat, just like your iced tea glass. Granted, there usually isn't a huge amount of moisture in the wall, but there always is some.
     
Similar Threads: electrolysis issue
Forum Title Date
Plumbing Forum, Professional & DIY Advice Copper pipes and electrolysis Jan 9, 2019
Plumbing Forum, Professional & DIY Advice Electrolysis question Apr 24, 2011
Plumbing Forum, Professional & DIY Advice Water Heater and Electrolysis Sep 8, 2008
Plumbing Forum, Professional & DIY Advice I’d like to understand the PEX to tub spout issue a little better Jul 18, 2021
Plumbing Forum, Professional & DIY Advice Powervent water heater combustion issues Jul 8, 2021

Share This Page