Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-20-2011, 07:39 PM   #1
Member
 
Join Date: Feb 2009
Location: Minnesota
Posts: 79
Share |
Default

How to protect PVC pipe when soldering near it?


I need to replace some copper fittings that are only about 3 inches below and slightly to the side of a PVC drain pipe. How can I protect the PVC pipe so it doesn't start melting when I solder that close to it? I tried an Oatey flame protector cloth, but it started to melt the PVC where the cloth touched the PVC pipe.

Maybe the best option is to cut out the PVC pipe and replace it when I'm done soldering, but I'd prefer not to do that if I don't have to (it's in a tight spot so I'd have to use a cable saw, which I've heard doesn't cut real even).

I was wondering if a wet rag wrapped around the PVC pipe would help at all? Or if I ran cold water from a sink through that drain pipe while I was soldering near it, would that keep the pipe cool enough to not melt? You know how copper pipe doesn't get hot enough when soldering when there's water in the pipe? Was wondering if having a constant flow of cold water going through the PVC pipe would keep it cool enough?

Any suggestions are welcomed!

Studly is offline   Reply With Quote
Old 11-20-2011, 07:45 PM   #2
DIY staff
 
Join Date: Sep 2009
Location: Kane county,Illinois
Posts: 21,415
Default

How to protect PVC pipe when soldering near it?


You are on the right track----wrap it in a dripping wet rag then place a steel plate in front of it--

I have a number of steel electric box covers that I keep handy for that purpose---they have handy 'ears' to hold a screw or bit of wire.

__________________
New members: Adding your location to your profile helps in many ways.--M--
oh'mike is offline   Reply With Quote
Old 11-20-2011, 07:54 PM   #3
Member
 
Join Date: Feb 2009
Location: Minnesota
Posts: 79
Default

How to protect PVC pipe when soldering near it?


Quote:
Originally Posted by oh'mike View Post
You are on the right track----wrap it in a dripping wet rag then place a steel plate in front of it--

I have a number of steel electric box covers that I keep handy for that purpose---they have handy 'ears' to hold a screw or bit of wire.
Great idea, but I'm not able to fit a steel plate in there between where I'll be soldering and the PVC pipe ... I'd need something bendable/flexible to get it in place to protect the PVC pipe.
Studly is offline   Reply With Quote
Old 11-20-2011, 07:57 PM   #4
Military Mom of 4
 
Snav's Avatar
 
Join Date: Aug 2009
Location: Arkansas
Posts: 974
Default

How to protect PVC pipe when soldering near it?


pvc and cpvc have various slip-couplings and so forth which might be useful to remove/replace.

I'd go to the hardware store and look at the options available. . . I wouldn't try to solder with the pipe there - even with protection in place it might weaken it and cause a problem and then what? you'll still be dealing with the same issue - just at a later time.
__________________
At this present moment in time I am making cabinets for the kitchen - just in case you wanted to know what I'm doing when I'm not around.
Snav is offline   Reply With Quote
Old 11-20-2011, 08:09 PM   #5
Member
 
Join Date: Aug 2010
Posts: 1,526
Default

How to protect PVC pipe when soldering near it?


Try this.



Works pretty well in those potentially flammable/melt-able situations where you need a little flexibility.
VIPlumber is offline   Reply With Quote
The Following User Says Thank You to VIPlumber For This Useful Post:
Snav (11-20-2011)
Old 11-20-2011, 08:18 PM   #6
Newbie
 
Join Date: Nov 2011
Posts: 22
Default

How to protect PVC pipe when soldering near it?


Put a piece of sheet metal in front of the PVC to keep the flame/ heat off
Service plumber is offline   Reply With Quote
Old 11-21-2011, 06:10 AM   #7
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,622
Default

How to protect PVC pipe when soldering near it?


cut back on the flame don't need to go in with an afterburner going...place the torch shank against the PVC and let the flame just roll over the fitting be clean and solder paste.if you doing an elbow just bearly hit the bend DON'T move the torch the heat will cover the copper without moving it......if the shank is touching that PVC the heat will go away from it... piece of sheet rock or 1/2 plywood sprayed with water slipped between them is another trick.check this video out see how this guy goes right at the fitting not concerned with whats behind it... and the torch is blasting go softer on the flame...see when he does the elbow cut back the flame and just hit the bend about a 1" away without moving the torch hook the solder 360 around the joint without moving it...pull the torch back to control the melting solder and if you go to flux it after just let the flux drip onto it don't brush hot solder....

Last edited by biggles; 11-21-2011 at 06:41 AM.
biggles is offline   Reply With Quote
Old 11-21-2011, 09:29 AM   #8
Member
 
Join Date: Feb 2009
Location: Minnesota
Posts: 79
Default

How to protect PVC pipe when soldering near it?


Quote:
Originally Posted by biggles View Post
cut back on the flame don't need to go in with an afterburner going...place the torch shank against the PVC and let the flame just roll over the fitting be clean and solder paste.if you doing an elbow just bearly hit the bend DON'T move the torch the heat will cover the copper without moving it......if the shank is touching that PVC the heat will go away from it... piece of sheet rock or 1/2 plywood sprayed with water slipped between them is another trick.check this video out see how this guy goes right at the fitting not concerned with whats behind it... and the torch is blasting go softer on the flame...see when he does the elbow cut back the flame and just hit the bend about a 1" away without moving the torch hook the solder 360 around the joint without moving it...pull the torch back to control the melting solder and if you go to flux it after just let the flux drip onto it don't brush hot solder....
Good advice above on how to handle the torch. I'm using propane ... it I soften/shorten the flame, will it still get the fitting hot enough to melt the solder? Before when I was using the flame protector cloth, my flame was touching the cloth at times, and then where the cloth touched the PVC, it started slightly melting the PVC. So if I can dial back the flame, and still get the fitting hot enough, that might be the trick.

Thanks for the tips, everyone!
Studly is offline   Reply With Quote
Old 11-21-2011, 10:10 AM   #9
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,622
Default

How to protect PVC pipe when soldering near it?


the combo of the size of the flame and how close you are to the copper is forgiving....keep the flame as i said 1" away closer to get the first heat in there then back it off....the smaller the fitting the quicker it heats up and needs testing with the solder wipe and wipe...then once it melts go around 360 without moving the torch then to the other connection.once one connect takes the solder again back the torch off and wipe it(the second connection)2 Xs around your good.drip some flux onto the joints dont wipe ...let it cool and then wet an old rag and wipe it down....nice and shinny map gas or acytlene do about 500F just be clean with flux...pull out a lenght 6" of solder off the roll grab it with a piece of sandcloth or emory pad then dip it in the solder....you'll flow real easy with minimal heat...


Last edited by biggles; 11-21-2011 at 09:43 PM.
biggles is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Leaking drain pipe under kitchen sink dethun Plumbing 20 09-26-2012 07:30 AM
anybody want to clear something up for me? Pressure bfan781 Plumbing 10 06-12-2011 06:52 PM
replacing cast iron pipe davemarz Plumbing 1 05-20-2011 09:16 PM
Buried gas pipe in conduit WillK Plumbing 4 01-07-2011 12:50 PM
Soldering copper pipe gail synsteby Plumbing 14 03-22-2008 12:08 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.