[modeleng] Re: New boiler test rules
- From: Allen Messer <al_messer@xxxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sun, 15 Jan 2006 20:47:54 -0800 (PST)
Does de-Zincification occur when a boiler joined with
Phos-Copper is fired by Propane ONLY??
Al Messer
--- Harry Wade <hww@xxxxxxxx> wrote:
> At 11:16 PM 1/15/06 -0000, you wrote:
> >The dezincification does not take place in the
> copper but if the wrong
> >jointing material is used it takes place in that.
> >For instance it happens if Phosphor/copper brazing
> rods have been used. The
> >tell tail sign is that as the zinc leaches out the
> material goes pink and
> >feels greasy - Regards, Clif
>
> Clif,
> That's what I thought was meant, but I wasn't
> sure. I have a Maid
> of Kent whose boiler I had to discard right out
> because (among a number of
> other badly done things things) the joining was done
> in yellow brazing
> alloy. I was not about to wait for it to fail.
> Generally we assign other shortcomings to
> phos-copper, not normally
> dezicification, but alloys do vary and this
> contributes to the position
> held by many of us, which we would like to see
> accepted as universal, that
> phos-coppers are inappropriate for boiler work. The
> manufacturers say as
> much. Unfortunately we still have folks whose
> primary concerns are
> quickness and cheapness who continue to criticize
> silver soldering as an
> unneccessary trouble and expense.
>
> Regards,
> Harry
>
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