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Date: 23 Jan 2007 14:10:54
From: notbob
Subject: bronze disease on my La Pavoni
It appears I have a case of bronze disease on the threads of the
filler port. A bright green powdery patina has formed on the threads
where the water fill plug screws into the top of my Europpicola. I
can brass wire brush the stuff off the black plastic plug, but don't
want to use abrasive techniques on the metal threads. What could I
use to remove this patina? Is Tarnex worth a damn or a no-no?

nb




 
Date: 25 Jan 2007 05:07:32
From: Omniryx@gmail.com
Subject: Re: bronze disease on my La Pavoni
If, indeed, you have bronze disease (which is unlikely with modern
alloys), simply removing the green fluff and smearing on grease will
not stop it in that wet environment. You will either have to somehow
remove the cuprous chloride that is the culprit or ultimately it will
consume your fitting.

Google for definitive fixes.




On Jan 24, 7:19 pm, notbob <not...@nothome.com > wrote:
> On 2007-01-23, chardinej <chard...@nbnet.nb.ca> wrote:
>
> > Why not? Running threads over a wire wheel is standard practice, at
> > least in motorcycle mechanics....Any mechanic
>
> > worried about the threads, use a brass wire wheel. I wasn't sure I could find a brass wire wheel small enough. Sure
> enough, I did. Dremel makes an itty bitty 3/4" brass wire wheel
> and the arbor just happened to fit my ancient Craftsman moto-tool.
> Worked good enough to get all but the thread root.
>
> nb



 
Date: 23 Jan 2007 13:42:58
From: chardinej
Subject: Re: bronze disease on my La Pavoni

notbob wrote:
> It appears I have a case of bronze disease on the threads of the
> filler port. A bright green powdery patina has formed on the threads
> where the water fill plug screws into the top of my Europpicola. I
> can brass wire brush the stuff off the black plastic plug, but don't
> want to use abrasive techniques on the metal threads. What could I
> use to remove this patina? Is Tarnex worth a damn or a no-no?
>
> nb

Why not? Running threads over a wire wheel is standard practice, at
least in motorcycle mechanics, and I'm sure in plumbing too. If you are
worried about the threads, use a brass wire wheel and *gently* offer up
the threads. Not knowing your machine, I assume the stopper is
pressurised, i.e., you are filling directly into the boiler. If so then
the threads are not providing the pressure-tight seal anyway, so again,
what's the problem?

As to the "bronze disease", which is may or may not be, you need to
clean the threads on a wire wheel and then seal the alloy with an
appropriate product such as food-grade wax, grease, vaseline, or
acceptable varnish. This will not be a permanent fix so you will have
to repeat every now and then.

John



  
Date: 24 Jan 2007 18:19:37
From: notbob
Subject: Re: bronze disease on my La Pavoni
On 2007-01-23, chardinej <chardine@nbnet.nb.ca > wrote:

> Why not? Running threads over a wire wheel is standard practice, at
> least in motorcycle mechanics....

Any mechanic

> worried about the threads, use a brass wire wheel.

I wasn't sure I could find a brass wire wheel small enough. Sure
enough, I did. Dremel makes an itty bitty 3/4" brass wire wheel
and the arbor just happened to fit my ancient Craftsman moto-tool.
Worked good enough to get all but the thread root.

nb