Refitting Black Pipe That Has Black Gunky Dope Settled In - 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 06-13-2008, 10:35 AM   #1
Member
 
Join Date: Apr 2007
Posts: 2,302
Rewards Points: 1,038
Question

refitting black pipe that has black gunky dope settled in


i am branching out my black gas piping for a stove and i have a cap where i left off last time. i plan to take it off and extend it a few more turns to the destination. however, when i looked closely, the black gunky dope that i used, which was the only one that made me feel safe when gas was in question, seems settled in pretty hard and tight.

Q1: will it be a b..ch to take the cap off ?
Q2: if i do manage to break the seal and twist it off, will i be able to refit over the threads that have the gunky dope settled in ?

Advertisement

amakarevic is offline   Reply With Quote
Old 06-13-2008, 11:27 AM   #2
Registered User
 
Termite's Avatar
 
Join Date: Apr 2008
Posts: 6,520
Rewards Points: 2,000
Default

refitting black pipe that has black gunky dope settled in


I don't think it will be a problem. It will take a couple pipe wrenches to get the cap off. Just apply more gunk...It'll be fine.

Hopefully you're air testing your gaslines before you run gas to them??? You need to be.

Remember, your gasline has about 1/2psi of pressure in it...That's very, very little pressure. Leaks can be detected by using soapy water, but an airtest is required by code and is a very good idea. Around here, most cities require 10psi for 15 minutes. If the pressure drops on the gauge, you have a leak. The highest pressure you can run in a house is an elevated pressure system, which is 2psi, and is pretty rare....So, a 10psi airtest will force a leak if there's a poor connection.

Advertisement

Termite is offline   Reply With Quote
Old 06-13-2008, 12:07 PM   #3
Member
 
Join Date: Apr 2007
Posts: 2,302
Rewards Points: 1,038
Question

refitting black pipe that has black gunky dope settled in


how do you air test ?
amakarevic is offline   Reply With Quote
Old 06-13-2008, 02:32 PM   #4
Registered User
 
Termite's Avatar
 
Join Date: Apr 2008
Posts: 6,520
Rewards Points: 2,000
Default

refitting black pipe that has black gunky dope settled in


Oh no! You gotta air test if you're running new lines in your house for goodness sake! You won't be able to hear a gas leak since it is such low pressure, soap and water isn't foolproof under gas pressure, and by the time you smell it...It could be a real problem.

Plumbers use a 15psi dial gauge threaded onto the pipe. CLOSE OFF THE VALVES TO ALL APPLIANCES...They can't take the pressure the airtest involves. You can only test to the valves. Most gauges are 1/2" NPT, and you can get them at plumbing stores or some home centers. They have a schraeder valve just like your car tires. You use a compressor or a bike pump (yes, a bike pump) to air up the line and watch the gauge for at least 10 or 15 minutes to see if the pressure drops.

If the pressure drops, use a sprayer full of very soapy (liquid dish soap) water to spray every single connection. Really hose them down. Use a flashlight, and watch for bubbles to form. If the bubbles grow bigger, you've found a leak. At 10-15psi, the bubbles will be pretty easy to spot.
Termite is offline   Reply With Quote
Old 06-13-2008, 08:49 PM   #5
Doing it myself
 
Alan's Avatar
 
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,762
Rewards Points: 2,024
Send a message via AIM to Alan Send a message via MSN to Alan
Default

refitting black pipe that has black gunky dope settled in


We usually leave our gauge on for about a day at least, and then come back and look at it. I believe our test only requires twice the pressure that is going to be run through the pipe, but we use a 30# gauge and pump it all the way up.
__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 06-16-2008, 11:50 AM   #6
Member
 
Join Date: Apr 2007
Posts: 2,302
Rewards Points: 1,038
Question

refitting black pipe that has black gunky dope settled in


Quote:
Originally Posted by thekctermite View Post
Oh no! You gotta air test if you're running new lines in your house for goodness sake!
Dude - what do you pump into when the line is hooked to the meter ???
amakarevic is offline   Reply With Quote
Old 06-16-2008, 01:05 PM   #7
Member
 
Joe F's Avatar
 
Join Date: Jan 2008
Location: Washington, DC
Posts: 273
Rewards Points: 250
Default

refitting black pipe that has black gunky dope settled in


Quote:
Originally Posted by amakarevic View Post
Dude - what do you pump into when the line is hooked to the meter ???
Use air, put a valve beetween the "old" line and the new. Do your test with that valve closed.

Advertisement

__________________
If you don't stand behind our troops, please feel free to stand in front of them.
Joe F 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
Teflon tape or pipe dope chickenboo Plumbing 50 06-29-2011 09:16 AM
Flex line from black pipe to appliance kennethjyoung Plumbing 9 02-24-2008 07:21 PM
Repairing black poly pipe MelAuston Plumbing 4 10-31-2007 09:54 PM
Rust Spot on Water Pipe (Cast Iron or Black Iron maybe?) markmaclean80 Plumbing 6 08-22-2007 09:20 PM
Threading black iron pipe? sandyman720 Plumbing 3 03-12-2007 07:50 PM




Top of Page | View New Posts