Text 17735, 102 rader
Skriven 2011-11-14 06:47:42 av Dave Drum (1:261/38)
  Kommentar till text 17729 av Dave Sacerdote (1:123/140)
Ärende: plumbing
================
-=> DAVE SACERDOTE wrote to DAVE DRUM <=-

 DD> If the joins on the copper are done properly - even using 50-50
 DD> solder (50% each lead and tin) is not going to expose more than
 DD> minimal lead to the water.

 DS> The problem is finding someone who knows what they're doing. I've seen
 DS> some pretty sloppy soldering jobs by professional plumbers.

 DS> Lead does leach from 50/50 solder, though, and that's why it's not
 DS> commonly sold in states where code requires lead-free solder (and
 DS> I'm not at all sure that any state at all still allows the use of lead
 DS> in plumbing solder any more. I can only speak for Connecticut, where
 DS> it's banned.)  You can still get 50/50 at stained glass supply places
 DS> because it's the best solder to use for lead panel work.

My point was that given the way copper pipes and fitting slide together, a
properly sweated joint will not expose more than extremely minimal solder to
the water. Of course in this day of legislation/regulation by "Oh, my g*d",
pressure group, etc. who always see the absolute worst case scenario for all
events ... uh, I'll shut up lest I get off on a rant. Suffice it to say that
the situation is analogous to the EPA going after every molecule of loose lead
or benzene or whatever their cause of the day happens to be.

 DD> Some places/plumbers/people use a method called "silver
 DD> soldering" which is the same in refrigeration repairs.
 DD> It uses a brass/tin mixture (with minimal or no actual silver)
 DD> to flow into the joint.

 DS> True sliver solder is used in refrigeration and jewelry and most
 DS> often contains about 40% silver. The non-lead-based solders used
 DS> for common plumbing might be labeled "sliver solder," but they're
 DS> not. They're also "chalky" and harder to use. I hate them, but I
 DS> use them anyway when I'm doing plumbing because I don't want problems
 DS> down the road with possible inspections.

If you can afford it - tin works well. Pewter is a malleable metal alloy,
traditionally 95-99% tin, with the remainder consisting of copper, antimony and
bismuth. Copper and antimony act as hardeners. Pewter is fairly easy to work
with for casting - although I have not soldered with it - except in soldering
pewter handles onto pewter drinking vessels (tankards, mostly) which can be
tricky as all the metals are the same with the same melting point.

The "silver solder" I used in jewelry making was *much* more silver bearing
than the stuff I used in repairing refrigeration equipment - if it had any
silver at all it was tiny percentages -- as reflected in the price.

 DS> Also, if you have a lot of lead solder joints in your plumbing and
 DS> you;re worried about lead content, just run the water a little before
 DS> using it to flush out the "contaminated" water. It doesn't leach into
 DS> the water running by the joint, it leaches while standing.

I'm not worried about it. Hell, the Romans used lead pipes, lead plates, lead
tableware, etc. and look where it got them ... Gina Lollabrigida, Sophia Loren,
Leonardo DaVinci, Guglielmo Marconi, etc. Of course it also got them Silvio
Berlusconi.  Bv)=

 -> The main drawback is that it requires higher heat and is harder to
 -> do correctly (no leaks).

 -> If you think copper and PVC leach - try living in an old structure with
 -> black iron or galvanised iron plumbing. You'll never have to take
 -> supplemental iron again.   Bv)=

It's all pretty much moot for me, now. This mobile home is PVC (mostly). And I
can wield a glue pot with the best of them.   Bv)=

MMMMM----- Recipe via Meal-Master (tm) v8.06

      Title: Roman Egg Soup
 Categories: Poultry, Soups, Eggs, Cheese, Pasta
      Yield: 4 Servings

      4 c  Chicken broth
      4    Eggs
  1 1/2 tb Parmesan cheese
      1 tb Parsley; chopped
      1 c  Cooked noodles
  1 1/2 tb Flour
           Salt & pepper

  Place chicken broth in a soup kettle. Bring to a slow
  boil. Add cooked noodles to broth and boil gently. Beat
  eggs in a bowl until thick. Combine with flour, cheese,
  salt and pepper. Stir a little broth into eggs. Slowly
  pour the egg mixture into simmering broth, stirring
  gently. Continue to stir, simmer for five minutes.

  Top with parsley.

  Makes four servings

  From: http://www.recipesource.com

  Uncle Dirty Dave's Archives

MMMMM

... Our national flower is the concrete colverleaf. -- Lewis Mumford

--- BBBS/Li6 v4.10 Dada-1
 * Origin: Prism bbs (1:261/38)