Fredxx wrote:

On 03/05/2020 13:13:52, Robin wrote:
On 03/05/2020 12:33, Dave Plowman (News) wrote:
In article ,
Roger Hayter wrote:
I note that reference confirms my supposition that a fresh lead surface
leads to increased lead levels in the water. I note that lead free
solder may be permitted, but I look forwarded to hearing from anyone who
has successfully made a wiped joint with it.

You don't need a pretty wiped joint to join lead to copper. Merely a
decent seal between the two.


Simply running solder into the join would not have passed inspection for
a professional job.

You have provided no evidence of that.

The solder had to be built up in layers to give
the thick "bandage" to guard against leaks. The wiping wasn't just to
make it look pretty.

You are comparing a but join where solder is built up as a bandage, and
a join where a copper pipe enters a lead pipe for 25-50mm.

They simply do not compare. It suggests you have never connected a
copper pipe to a lead pipe. There is no need for layers to guard against
a leak.

Solder joints have a propensity to separate when any forces are put on
them. Lead pipes, being flexible, are likely to move significantly.
Unless the copper pipe is so wedged that it can't even rock, which would
need more than 50mm, there is a risk of latter leakage if the joint is
subject to vibration or bending. So I think a proper wiped joint is
not just a conceit of traditonal plumbers.
--

Roger Hayter