Ian Stirling wrote:
Richard wrote:

So, my 'magnets won't stick to stainless steel' test is flawed?


Yes.
Some stainless steel is magnetic, and some stainless becomes magnetic
after it is stressed.

Ah! Thanks for that. The offcuts that we tested are not particularly
shiny - which is what I'd expect for SS - and have the sort of rainbow
sheen that you see on steel tent poles. Would SS have been used on
pipes that never saw the light of day, even in days of copper scarcity?

How are the existing joints made? As I said above they are some sort of
heated joint into copper fittings. I jokingly suggested that my
neighbour silver solder or braze the new fittings.

Rgds Richard


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