In article , harry
wrote:
On Wednesday, 13 March 2019 10:26:56 UTC, charles wrote:
In article ,
harry wrote:
On Tuesday, 12 March 2019 18:52:04 UTC, wrote:
On Tuesday, 12 March 2019 07:41:21 UTC, harry wrote:
On Monday, 11 March 2019 17:37:33 UTC, misterroy wrote:
What could have caused the heating pipe to corrode so badly
that it failed? It was next to an external wall and lagged. The
are a couple of lengths of the pipe lying outside the building
unused for the same 6 years, other than the threaded ends, they
look new. image
https://drive.google.com/open?id=1o8...cqBdRGYatmQb6R

If it is attached to copper pipe elsewhere in the system, zinc
and copper are perfect for galvanic action. Depends too on the
quality of the water in the system. Inhibitors are available.

Is there some way to stop this corrosion in a CH system using
copper pipes & a galvanised steel cylinder/tank?


NT

The reason why galv water tanks rusted was the copper pipes they were
attached to. Now we have plastic tanks.

Generally, any inhibitor in the system won't be in the header tank,
just in the pipework. Obviously, a problem if it's a galv.steel tank.

You normally pour the inhibitor into the header tank from where it
circulates round the system.

You won't get much in the system if you do that. The system has to be
partially drained and then the inhibitor added to get in in the
pipework/radiators.

That goes without saying. and you will stll have some inhibitot in the
header tank

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle