Backing Off OLD Galvanizd Pipe...& PVC To Cast Iron - Plumbing - DIY Home Improvement | DIYChatroom


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

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

Reply
 
Thread Tools Display Modes
Old 03-09-2008, 03:06 PM   #1
Newbie
 
Join Date: Dec 2007
Posts: 15
Rewards Points: 10
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


This is what happens when you decide to make the extra effort and paint a closet. you find things...

Our 2nd-floor tub drains into 2" galvanized (I think) pipe, which connects to a 4" cast iron stack. Where they were once threaded together has completely corroded away...due to electrolysis I was told. So far, I have opened up the wall and, with limited access, cut out part of the 2" galvinized pipe. The plan is to remove the section of 2" pipe back to its next threaded end (accessible) and then replace from the remaining 2" pipe (horizontal) to the cast-iron stack (vertical) with PVC.

Questions:
- I cannot back off the remaining 2" pipe out of the female end it is in. These are old pipes, obviously...Any advice on how to get these apart? I have tried heat and muscling it with a 14" pipe wrench? Or is it better to not break the bond and tie the PVC into the existing pipe with some kind of no-hub coupling?

- The female receptor (for lack of a better word) on the cast-iron stack looks pretty messy, and I'm not confident that the PVC with tread in all that well, if at all. Has electroylsis eaten the iron too? Can I still work with this and somehow complete the bond between the 2 materials with an epoxy or something (a JB Weld type of thing)?

Thanks for any info/advice,
-Mike

Advertisement

michael76 is offline   Reply With Quote
Old 03-09-2008, 03:22 PM   #2
Newbie
 
Join Date: Dec 2007
Posts: 15
Rewards Points: 10
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


Portions of the old, correded pipe are firmly stuck in the threads of the cast iron...is there a way to reduce PVC fittings to get in there, then complete the bond with application after install (like the JB Weld I mentioned in the first post)?

Thanks again,
-Mike

Advertisement

michael76 is offline   Reply With Quote
Old 03-09-2008, 05:41 PM   #3
Florida Cracker
 
Join Date: Feb 2008
Posts: 52
Rewards Points: 75
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


I am not a plumber.
But, if I needed that done in one of my houses, I would use a rubber coupler with hose clamps to make the connections.
I have no clue if that is up to code in your area, but it seems to make a good, leak-free repair.
Jack A. Trades is offline   Reply With Quote
Old 03-09-2008, 07:51 PM   #4
Member
 
Join Date: Aug 2007
Location: Long Island, New York
Posts: 650
Rewards Points: 500
Send a message via AIM to Marlin
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


A picture would be nice. From what I can gather you should cut the galvanized 2" short of the cast iron hub. Use that 2" to transition to PVC with a no hub clamp. Cut as much of the galvanized out as possible. If you can't get it all out use a no hub clamp on the other end as well to transition to PVC. Use banded no hub clamps, they will have a solid metal band all the way around them. Do not use the type with two hose clamps.
It is possible the hub is damaged or that you damaged the lead joint by applying heat and torque to the soil adapter. Their is no way for us to tell without looking at it though.

Old galv. pipe almost never backs out, when it does it usually takes a combination of 24" or larger pipe wrenches, heat, a hammer, and a good bit of luck.
Marlin is offline   Reply With Quote
Old 03-09-2008, 09:09 PM   #5
Newbie
 
Join Date: Dec 2007
Posts: 15
Rewards Points: 10
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


here are some pics...i did this quick and hope you can see everything (some copper pipes are in the way.

thanks again,
-Mike
Attached Files
File Type: zip P1000356.zip (73.0 KB, 749 views)
File Type: zip P1000357.zip (96.3 KB, 349 views)
michael76 is offline   Reply With Quote
Old 03-09-2008, 09:22 PM   #6
Member
 
Join Date: Nov 2005
Posts: 232
Rewards Points: 150
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


I would tear out enough wall or whatever it takes to get the whole chunk of galvinized out of there,,,its just the first sx of total failure,,,try taking the lead joint off the cast stack and Ferco doughnut it to the plastic and run plastic all the way,,,it is probably lost its drain from hair,rust and soap scum inside anyway!! Replace the trap with a plastic one also,,,they dont rust thru!!

Might as well take any metal tailpeices off the tub while your at it,,,plastic dont rust thru,metal does,,,OR you will be back tearing this apart NEXT year,,,or sooner!! While your at it you may as well somehow make a plumbing access in this closet for this whole thing!! Paneling,plywood,or similiar with removable screws is nice.
justdon is offline   Reply With Quote
Old 03-09-2008, 09:25 PM   #7
Journeyman Plumber
 
Ron The Plumber's Avatar
 
Join Date: Jun 2006
Location: Eugene, Oregon
Posts: 1,994
Rewards Points: 1,000
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


I posted the picture for you.

What you need to do is remove the existing pipe that is inside that cast hub, it will be leaded in, hammer, screw drivers, anything you can use to dig the stuff out with, it will come out of there, then go to a supply house and ask for a 2" tight seal, a rubber seal that will allow you to insert abs or pvc pipe into that existing hub, giving it a water tight seal, then use a fernco coupling to reconnect back onto the galvi pipe you see to the left.

You may have to open wall up more to be able to work in that area.
Attached Images
 
__________________
Fix it right the first time, so you won't have to fix it a 2nd time.

2008 Oregon Specialty Plumbing Codes
Ron The Plumber is offline   Reply With Quote
Old 03-09-2008, 09:38 PM   #8
Building and plumbing
 
USP45's Avatar
 
Join Date: Dec 2007
Location: farmville, VA
Posts: 244
Rewards Points: 150
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


Ron, are you referring to the same type of gasket that is used in cast iron floor drains? If so may I suggest that he bevel the edge of the PVC first, then rub some "Duck Grease" on the gasket to make the pipe slip in easier? This is what we do when inserting PVC into those cast iron floor drains with those rubber gaskets, otherwise we kill ourselves trying to get it in.
USP45 is offline   Reply With Quote
Old 03-09-2008, 09:44 PM   #9
Journeyman Plumber
 
Ron The Plumber's Avatar
 
Join Date: Jun 2006
Location: Eugene, Oregon
Posts: 1,994
Rewards Points: 1,000
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


Quote:
Originally Posted by USP45 View Post
Ron, are you referring to the same type of gasket that is used in cast iron floor drains? If so may I suggest that he bevel the edge of the PVC first, then rub some "Duck Grease" on the gasket to make the pipe slip in easier? This is what we do when inserting PVC into those cast iron floor drains with those rubber gaskets, otherwise we kill ourselves trying to get it in.
Yes thats what I'm talking about, I'll slap some pipe dope on the pipe so it will slip in easy. I was trying to find a picture on the net, but not sure of the name, we call them tight seals.

It has tapered ribs inside the seal.
__________________
Fix it right the first time, so you won't have to fix it a 2nd time.

2008 Oregon Specialty Plumbing Codes
Ron The Plumber is offline   Reply With Quote
Old 03-09-2008, 09:48 PM   #10
Building and plumbing
 
USP45's Avatar
 
Join Date: Dec 2007
Location: farmville, VA
Posts: 244
Rewards Points: 150
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


Thats what I thought. I can not remember what we call them and what I want to call them I can not say here!
Also if you use a twisting motion will help set the pipe too.
Have you ever had to do that with 4" pipe? talk about a bad hair day!
USP45 is offline   Reply With Quote
Old 03-09-2008, 09:54 PM   #11
Journeyman Plumber
 
Ron The Plumber's Avatar
 
Join Date: Jun 2006
Location: Eugene, Oregon
Posts: 1,994
Rewards Points: 1,000
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


I had to with 3" came down to a block of wood and a sledge hammer to get it seated, that sucked big time.
__________________
Fix it right the first time, so you won't have to fix it a 2nd time.

2008 Oregon Specialty Plumbing Codes
Ron The Plumber is offline   Reply With Quote
Old 03-10-2008, 01:09 PM   #12
I blame ProWallGuy
 
Join Date: Sep 2006
Posts: 244
Rewards Points: 150
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


Know as a Ty Seal. Not sure of the proper generic name.




But, I'm afraid that is a threaded tee, and not a bell fitting.

I think that tee will need to be cut out, or the old male pipe threads cut out and the female threads chased with a 2" die. That is going to run you $120.00 - $150.00 to buy if you can't rent one, not to mention trying to get it started straight so it follows the old threads.
Double A is offline   Reply With Quote
Old 03-10-2008, 04:54 PM   #13
Member
 
Join Date: Aug 2007
Location: Long Island, New York
Posts: 650
Rewards Points: 500
Send a message via AIM to Marlin
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


Double A is right. That isn't a hub on that tee so a dual tight will not work. The best thing to do is get that tee out of there and put a PVC tee in it's place.


Another idea I have, wait for another opinon on this one though. A 4" x 2" no hub clamp may fit on the outside of the fitting though. Measure the outside diameter of the tee then ask to see a 4" x 2" cast iron no hub clamp and a 4" copper by 2" cast iron clamp. If they don't have a 4" x 2" adapting clamp ask to see a 4" copper by 4" or 3" (preferably) clamp. The copper clamp will be tighter than the cast one and may fit better.
If the copper one is the better fitting one and they don't have a 4" CU x 2" CI use whichever one they did have with a short piece of 3" or 4" PVC then a PVC reducing coupling to get you down to 2".
Cut everything off flush with the cast iron hub and clean it up well. Then smear a thin coat of silicone on the face of the tee and apply a bit to the bottom of the 4" side of the no hub clamp, you don't need to do the sides or the 2" side.
Go with whichever one is closer. You can stretch the clamps out a little bit if need be, better to be a little tight then really loose.


A 4" x 2" fernco will defiantly work to get you back in business temporarily if you have no shower at this point. The fernco is not a perminant solution, it will cause clogs and cause the cast iron to rot over time.

Last edited by Marlin; 03-10-2008 at 05:06 PM.
Marlin is offline   Reply With Quote
Old 02-18-2009, 12:18 AM   #14
Member
 
Join Date: Jun 2008
Posts: 855
Rewards Points: 526
Default

Backing off OLD galvanizd pipe...& PVC to cast iron


whats on top of this tee yet?? and whats below it? feet? fittings? IF there is ANY way you can get the whole mess outta there and redo with plastic,,,you will be so much happier down the road,,once these start its only a matter of time for another to sprout a leak!! Replacing a few wall sections of drywall or patching what needs to be,is a far less evil that that alligator waiting to bite you in the butt AGAIN!! Otherwise take out from tee up at least.

Advertisement

4just1don is offline   Reply With Quote
Reply


Thread Tools
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
How to repair a hole in cast Iron pipe? bofusmosby Plumbing 26 11-13-2011 10:35 AM
smoothening cut cast iron pipe before mounting fernco coupling amakarevic Plumbing 6 11-15-2007 06:39 PM
Help with Cast Iron Material Tester Plumbing 2 10-25-2007 11:58 AM
Rust Spot on Water Pipe (Cast Iron or Black Iron maybe?) markmaclean80 Plumbing 6 08-22-2007 09:20 PM
Old cast iron pipes heather92 Plumbing 2 04-10-2007 09:36 AM




Top of Page | View New Posts