Reply
 
Thread Tools Search this Thread Display Modes
 
Old 07-26-2013, 12:31 AM   #1
2 Rivet Member
 
Woodywhite's Avatar
 
1960 18' Traveler
1975 27' Overlander
La Honda , California
Join Date: Jun 2009
Posts: 59
Smile Cast iron out, plastic in

I've got a 1960 18' Traveler with the original cast iron waste lines that have started to leak at the waste tank. Rather than repair, it seems a good time to replace the whole system. Reviewing the past posts, it seems like converting to PVC is a reasonable change. Given the age of my little trailer, it tends to bounce a bit so I'm concerned about vibration prematurely aging the plastic. Any of you have trouble with plastic waste lines instead of iron? It would be nice to lose a little weight (not just the traveler...) as long as cracking/leaking isn't an issue.

Thanks,
Bob
__________________

__________________
Woodywhite is offline   Reply With Quote
Old 07-26-2013, 03:30 AM   #2
Huh?
 
Ultradog's Avatar
 
1975 27' Overlander
Twin Cities , Minnesota
Join Date: May 2003
Posts: 494
Images: 8
Your waste lines are probably galvanized steel and not cast iron. Some of the joints may be CI though.
Not that that matters much.
Others here could probably tell you more about the effects of road vibration on pvc but I would think you would have few, if any problems with it.
Keep in mind that the best way to avoid vibration fatigue is to not allow things to vibrate. An extra pipe strap or two to keep the pipe/s immobile would solve any potential problems.
The same thing holds true on power steering and hydraulic lines on tractors. They will fatigue and fail quickly if not properly secured. But using all the OEM brackets and securing devices will insure many years of trouble free operation.
__________________

__________________
Ultradog is offline   Reply With Quote
Old 07-26-2013, 05:54 AM   #3
Rivet Master
 
andreasduess's Avatar
 
1984 34' International
Toronto , Ontario
Join Date: Jul 2012
Posts: 1,496
Images: 5
Blog Entries: 1
The lines aren't cast iron - it's too brittle and too heavy. They are most likely steel.
__________________
andreasduess is offline   Reply With Quote
Old 07-26-2013, 06:48 AM   #4
Rivet Master
Commercial Member
 
lewster's Avatar
 
Vintage Kin Owner
Naples, FL , Hood River, OR
Join Date: Dec 2005
Posts: 7,281
I have never seen PVC used as a waste line in an RV. All of the current OEMs use ABS from the waste tanks to the outlet valves. 3" for black tank lines and 1-1/2" for grey.
__________________
Lew Farber...ABYC Certified Master Marine Electrician...RVIA Certified Master Tech ...AM Solar Authorized Installation Center...AIRSTREAM Solar & Electrical Specialist...Micro Air 'Easy Start' Sales and Installations
lewster is offline   Reply With Quote
Old 07-26-2013, 07:14 AM   #5
Rivet Master
 
crispyboy's Avatar
 
1994 30' Excella
alexandria , Kentucky
Join Date: Aug 2004
Posts: 1,656
Images: 3
Quote:
Originally Posted by Ultradog View Post
Keep in mind that the best way to avoid vibration fatigue is to not allow things to vibrate. An extra pipe strap or two to keep the pipe/s immobile would solve any potential problems.
I would be careful about making things too rigid - the piping needs to be secured yet still be able to "flex" a bit. I don't remember seeing the plumbing strapped down too tightly.

I have only seen ABS used in rv and mobile homes. I assume there must be more give in this pipe than ABS.
__________________
Steve, Christy, Anna and Scout (Border Collie deceased 11-30-2016)
1994 Classic 30'11" Excella - rear twin
2009 Dodge 2500, 6 Speed Auto, CTD, Quad Cab, Short Bed
Hensley with adjustable stinger
WBCCI # 3072
crispyboy is offline   Reply With Quote
Old 07-27-2013, 12:22 PM   #6
2 Rivet Member
 
Woodywhite's Avatar
 
1960 18' Traveler
1975 27' Overlander
La Honda , California
Join Date: Jun 2009
Posts: 59
Thanks to all of you for your replies. So now I'm feeling comfortable with changing to plastic. I'm not familiar with the differences between ABS and PVC. I tend to overbuild so I don't have to repair so soon later. From other threads it sounded like PVC is stronger than ABS. Do the current manufacturers use ABS because functional but it's cheaper? Is PVC stronger but more brittle over time?

Or are both OK and I'm making much ado about nothing and I should use whichever I can easily get?

Thanks again for your help. I gotta the old girl's plumbing back on line in time for Burning Man. Wife is coming along for the first time so i need to be little more civilized.

Bob
__________________
Woodywhite is offline   Reply With Quote
Old 07-27-2013, 01:30 PM   #7
2 Rivet Member
 
awryawry's Avatar
 
2000 27' Safari
Durango , Colorado
Join Date: Jul 2013
Posts: 78
Images: 1
In my experience, the solvent welding of ABS is more comprehensive and integrating than PVC joints. In the past, I have been able to chisel PVC joints apart, whereas a properly glued ABS joint is forever, and likely stronger than the pipe or fittings themselves. If you choose PVC, I'd advise joining it the same way that I would join PVC pressure joints: lightly abrade the mating surfaces, use PVC primer, apply cement to spigot -- hub -- then spigot again, join, and hold. For a TT I'd recommend straps or bridge supports at no more than 2' o.c., as well as at critical direction changes.

Plumb crazy,

wryawry
__________________
.... pursue ease and grace ....
awryawry is offline   Reply With Quote
Old 07-27-2013, 04:27 PM   #8
2 Rivet Member
 
seldencove's Avatar
 
1963 28' Ambassador
Lyme , Connecticut
Join Date: Sep 2008
Posts: 88
Images: 16
My 1963 Ambassador has original abs waste lines, still working fine.....
__________________
2005 Ford Excursion V-10
Reese Trunnion Bar with dual cam sway control
Prodigy P3 brake control
seldencove is offline   Reply With Quote
Old 07-27-2013, 11:58 PM   #9
2 Rivet Member
 
Woodywhite's Avatar
 
1960 18' Traveler
1975 27' Overlander
La Honda , California
Join Date: Jun 2009
Posts: 59
Got it. That kind of gives me a nod toward ABS. So my next stop is to see if I can get the proper parts in ABS. If not, I'll try PVC with proper prep.

Thanks for your input. I'll let you know how it goes.

Bob
__________________

__________________
Woodywhite is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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



Virginia Campgrounds

Reviews provided by




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 12:16 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.