rticle copper corrosion of coils

[Peter_1]

http://txspace.tamu.edu/bitstream/handle/1969.1/4580/ESL-HH-02-05-30.pdf?sequence=5

[Peter_1]

Another one http://www.osti.gov/bridge/servlets/purl/491577-zuvMVN/webviewable/491577.pdf

[Peter_1]

Found all this while searching for information about copper corrosion. 2 cases I have for the moment: 1 piece of +/- 15 cm (7 inch) Armaflex isolated 1 3/8 pipe of a Daikin VRV, installed underground but in a seamless PVC sleeve, no water in the sleeve and +/- 50 leaks on it.

Another case: 2 independent evaporators in a ventilated counter and +/- both have leaks on 1 piece of +/- 10 cm (+/- 5 inch) 1/2 tube, sometimes 100 leaks on this end.
No agresive cleaning agents used, only twice a year cleaned with drinkable water.

[Peter_1]

http://www.errachidia.org/tv/1-brazing.html
Good brazing movies

[desA]

Very interesting Peter. Thanks for the links. :)

[chemi-cool]

You can always blame Global Warming......:D

Seriously, I have seen galvanised steel pipes wrapped with PVC isolation tapes and was told that it prevents all kinds of external corrosion.
Maybe it worth trying.