ADVrider

Go Back   ADVrider > Gear > The Garage
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 03-13-2007, 05:39 PM   #1
Pro_Marinero OP
Carbon Sasquatch
 
Pro_Marinero's Avatar
 
Joined: Feb 2005
Location: Ellensburg, WA
Oddometer: 2,086
Sealing hard compressed air lines

I'm in the process of plumbing hard air lines in my garage/shop. Everything is plumbed and now I'm seeing bubbles while doing the soapy water test at a couple of fittings. Is there a way to seal this without taking everything apart... like Permatex Aviation sealant? I happen to have some and I know it's tough but I'm looking for a second opinion. Thanks.
Pro_Marinero is offline   Reply With Quote
Old 03-13-2007, 05:58 PM   #2
KTM640Dakar
Motorsick
 
KTM640Dakar's Avatar
 
Joined: Nov 2004
Location: Oxbow Lake
Oddometer: 1,997
Teflon tape.
__________________
A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

It is not the destination, it's the journey.
KTM640Dakar is offline   Reply With Quote
Old 03-13-2007, 06:10 PM   #3
Lone Rider
Registered User
 
Joined: Jan 2002
Location: out and about
Oddometer: 25,130
Quote:
Originally Posted by KTM640Dakar
Teflon tape.
I thought it was a requirement....
Better than dope....pipe dope, that is.
Lone Rider is offline   Reply With Quote
Old 03-13-2007, 06:59 PM   #4
Pro_Marinero OP
Carbon Sasquatch
 
Pro_Marinero's Avatar
 
Joined: Feb 2005
Location: Ellensburg, WA
Oddometer: 2,086
I forgot to say I have teflon at all the fittings. Still having issues. Any good ideas beyond teflon?
Pro_Marinero is offline   Reply With Quote
Old 03-13-2007, 07:11 PM   #5
Harrington
Gnarly Adventurer
 
Harrington's Avatar
 
Joined: Feb 2006
Location: Left Coast
Oddometer: 375
What kind of piping are you talking about?
Harrington is offline   Reply With Quote
Old 03-13-2007, 07:28 PM   #6
Pro_Marinero OP
Carbon Sasquatch
 
Pro_Marinero's Avatar
 
Joined: Feb 2005
Location: Ellensburg, WA
Oddometer: 2,086
1/2" Galvanized
Pro_Marinero is offline   Reply With Quote
Old 03-13-2007, 07:34 PM   #7
comes naturally
renewed hope
 
comes naturally's Avatar
 
Joined: Oct 2005
Location: SE PA
Oddometer: 1,895
Quote:
Originally Posted by Pro_Marinero
1/2" Galvanized
That's what I used...did you tighten it with a pipe wrench?
comes naturally is offline   Reply With Quote
Old 03-13-2007, 07:34 PM   #8
normsworld
Adventurer
 
Joined: Dec 2006
Location: Yorktown VA
Oddometer: 65
I work with gas pipe for a living , sounds like its steel threaded pipe .I use teflon pipe dope , the taper in threads SEAL the joint and the dope is more or less a lubricant, possibly compressing in a gap . Unless you wanna weld it , take it apart ,check the threads and tighten it good this time . I've seen copper type M , PEX and heard of cpvc used for 100 psi air . I'm gonna use pex when I do mine .Love the shit it is not Quest at all !
normsworld is offline   Reply With Quote
Old 03-13-2007, 07:36 PM   #9
comes naturally
renewed hope
 
comes naturally's Avatar
 
Joined: Oct 2005
Location: SE PA
Oddometer: 1,895
How much is leaking?
comes naturally is offline   Reply With Quote
Old 03-13-2007, 07:36 PM   #10
normsworld
Adventurer
 
Joined: Dec 2006
Location: Yorktown VA
Oddometer: 65
Just saw it's galvinized , don't weld it!
normsworld is offline   Reply With Quote
Old 03-13-2007, 07:48 PM   #11
Harrington
Gnarly Adventurer
 
Harrington's Avatar
 
Joined: Feb 2006
Location: Left Coast
Oddometer: 375
Quote:
Originally Posted by Pro_Marinero
1/2" Galvanized
I'm a plumber. You shouldn't be having air leaks if the threads are good and you are making them up correctly. A good rule for threaded pipe is the 3 turn rule. You should be able to make up a threaded joint 3 full turns by hand before a wrench is needed. You can make an improper thread seal but it's harder, especially with over 100psi air.

Here's how I make up threaded joints. Start with good clean threads. I then put on a full swabs of teflon pipe dope. I then put on a few laps of telflon tape. It's important to put the tape on clockwise when you are looking at the end of the pipe. I then put more teflon dope over the tape. I use this method when I do most natural gas piping.

With that being said, I'd rather install copper air piping. It's faster to install and it works just the same.

DON'T USE PVC PIPING FOR AIR LINES---IT WILL EXPLODE UNDER PRESSURE IF HIT HARD ENOUGH---
Harrington is offline   Reply With Quote
Old 03-13-2007, 07:51 PM   #12
katbeanz
earthbound misfit, I
 
katbeanz's Avatar
 
Joined: Feb 2005
Location: Kansas City
Oddometer: 7,377
You should be able to run threaded pipe into fittings halfway by hand, I've used teflon tape and rectorseal both on some stubborn stuff, tape first, then the pipe dope. On air lines if the threads are cut right, usually just rectorseal.
Loctite also makes hydraulic sealant I've used successfully after others had tried, it's not coming apart without heat.
As far as compressed air, If I can't hear it, it's not a leak, unofficially.
katbeanz is offline   Reply With Quote
Old 03-13-2007, 07:51 PM   #13
Pro_Marinero OP
Carbon Sasquatch
 
Pro_Marinero's Avatar
 
Joined: Feb 2005
Location: Ellensburg, WA
Oddometer: 2,086
I followed the clockwise rule and thought I wrenched them on pretty good. Obviously not.
Pro_Marinero is offline   Reply With Quote
Old 03-13-2007, 08:37 PM   #14
hardybaker
Gnarly Adventurer
 
Joined: Apr 2003
Location: Marquez, Texas
Oddometer: 338
You did use tapered couplings didn't you? Somewhere, I have run across straight couplings that have caused me problems.
hardybaker is offline   Reply With Quote
Old 03-13-2007, 11:36 PM   #15
Pro_Marinero OP
Carbon Sasquatch
 
Pro_Marinero's Avatar
 
Joined: Feb 2005
Location: Ellensburg, WA
Oddometer: 2,086
Went back and did it right. Rectorseal and teflon tape all the way around and tightened 'er down good. I love doing a job twice.
Pro_Marinero is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
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 On

Forum Jump


Times are GMT -7.   It's 09:17 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014