Green copper pipes

[littlebrook]

Hi,

I was wondering whether I should worry about green patches appearing on my copper pipes, especially around the joints?

Thanks

[Cass]

The green patches could be nothing or they may be pin holes developing.

[Cass]

Around the fittings probably nothing between fittings very likely pin holes developing.

[littlebrook]

what causes pinholes?

[jadnashua]

Defective pipe, agressive water, poor elecrical grounding, excessive water flow velocity, excessive use of flux, not cleaning off flux residue...and probably other things as well.

[littlebrook]

probably bad electrical grounding in my case. When I moved into the house 18 months ago, the ground wire was loosely wrapped around the water meter. Don't know how long it was like that before I put a proper ground clamp on it.