what causes pipes to do this????????

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by detroithomeinspector, Oct 10, 2005.

  1. detroithomeinspector

    detroithomeinspector New Member

    Messages:
    6
    Location:
    Detroit Michigan
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    27,032
    Location:
    Cave Creek, Arizona
    joints

    Usually bad solder joints. Not bad enough to leak, but bad enough to seep water and when it evaporates it leaves the minerals behind. But it could be excessive flux on the joint, although flux is usually "burned" off during the process of soldering the joint.
  3. plumber1

    plumber1 Plumber

    Messages:
    1,423
    Location:
    Florida
    pipes

    It started out as sloppy soldering.
    The pipes were never wiped at that time of soldering.
    Sweaty pipes over several years will look like that.
    And some of those spots will develop pin holes.
  4. detroithomeinspector

    detroithomeinspector New Member

    Messages:
    6
    Location:
    Detroit Michigan
    detroit home inspector

    i agree that some of those spots will develop holes...but why does that happen??
  5. SteveW

    SteveW DIY Senior Member

    Messages:
    1,052
    Location:
    Omaha, NE

    See HJ's and plumber1's comments above -- flux wasn't properly wiped off at time joints were made and it can be corrosive over time (as I understand it).
  6. Gary Slusser

    Gary Slusser That's all folks!

    The spots in line on the underside of the tubing is from water droplets caused by humidity and 'sweating' pipes. I've never seen them lead to leaking. But flux that is acid based, and left on the copper, eats holes in the tubing and provides an excellent place for bacteria to live; which have an acidic waste, and both cause pinholes in copper tubing. Non water soluble flux happens to be the second most common cause of pinholes in copper tubing. The first or most common cause is not reaming the end of tubing that has been cut off with tubing cutters which allows for erosion corrosion caused pinholes.

    The white/gray residue is caused by water from 'sweating' corroding the solder; especially lead based solder.

    Gary
    Quality Water Associates
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