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Yellow residue on copper pipe joint

Discussion in 'Plumbing and Central Heating' started by Newby2, 30 May 2019.

  1. Newby2

    Newby2

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    hi
    As shown in the photo, there is some yellow powdery residue around the valve of one of the central heating copper pipes in the airing cupboard. It has been there for many years and so far there is no leak (it’s dry). Could someone tell me what it is and do I need to do anything about it?

    Many thanks.
     

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  2. undertrained

    undertrained

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    Hello Newby2,

    Looks like atmospheric corrosion to me, don’t really need to do anything, but if you wanted to you could get it replaced, as it may sieze up the gate valve.
     
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  3. Jackrae

    Jackrae

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    Dried corrosion inhibitor from an old weepage that has sealed itself. Let sleeping dogs lie.
     
  4. Madrab

    Madrab

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    If it's all dry and the valve works then just clean the scale off and don't worry about it.
     
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