Latest Discussions : Plumbing

himey18

03:48PM | 12/12/04
Member Since: 12/11/04
6 lifetime posts
I want to get rid of all my old galvanized pipes and replace with copper, but I am not sure of what size pipe to use. I want to replace eveything starting with the main line coming through the slab in my basement. I am a little fuzzy on how to measure the pipe so I know what I need to buy for any threaded fittings. I am a welder so I think sweating any other fittings shouldn't be a problem.

LonnythePlumber

05:54PM | 12/12/04
You probably have copper for a water service and you are going to hook to it with copper so you should not have any threaded fittings except at the water heater. If you have a one bathroom house then 3/4 inch will supply your fixtures. Soldering is not exactly the same as welding as you probably realize. You may want to replace just one fixture branch first to make sure your soldering will be okay.

We go by interior pipe sizing in plumbing. The outside of 3/4" copper is 7/8". The outside of 3/4" steel is an inch.

carl21l

09:12PM | 12/12/04
Member Since: 03/21/04
171 lifetime posts
to meet code, all of your soldering on plumbing must be made with leadfree solder using leed fre solder paste. I use Otay #5 myself. I have found that for a good solder connection on 3/4 copper fittings you really need to use a MAPP torch and MAPP gas to get the fittings hot enough for a good solder wick action.

JMHO

Carl

darwin802

01:29PM | 07/28/07
Member Since: 07/27/07
1 lifetime posts
you just put the flux on, heat up the two peices, touch the solder to the copper and the sloder follows the flux, right?

MistressEll

06:02PM | 07/28/07
Member Since: 01/30/05
360 lifetime posts
You need to burnish and clean both sides of the intended joint with emery cloth first.

It is also crucial you use the correct flux and solder.


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