Gas pipe extension downward?

Reply

  #1  
Old 08-18-19, 10:33 AM
Member
Thread Starter
Join Date: Jun 2014
Location: Canada, Quebec
Posts: 1,498
Upvotes: 0
Received 0 Votes on 0 Posts
Gas pipe extension downward?

In my house, every gas connection that goes up also has this 6-10" down connection with a stopper. Is this necessary and if so why?
 
Attached Images  
Sponsored Links
  #2  
Old 08-18-19, 01:35 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,892
Received 256 Votes on 241 Posts
That piece pointed downwards is called a drip leg.
Any water, moisture or crap will fall down into that stub rather then going into the appliance.
 
  #3  
Old 08-18-19, 02:40 PM
Member
Thread Starter
Join Date: Jun 2014
Location: Canada, Quebec
Posts: 1,498
Upvotes: 0
Received 0 Votes on 0 Posts
So when you connect a flexible pipe to somewhere else does it need to have a downslope or is it only for the incoming connections?
 
  #4  
Old 08-18-19, 04:13 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,892
Received 256 Votes on 241 Posts
A drip leg is typically installed right before each gas appliance.
Easy to do on a furnace or water heater. Not as easy on a gas stove.
 
  #5  
Old 08-18-19, 05:02 PM
Member
Thread Starter
Join Date: Jun 2014
Location: Canada, Quebec
Posts: 1,498
Upvotes: 0
Received 0 Votes on 0 Posts
I have a crawl space so could do one maybe 5' below the fireplace or hob.
Are you supposed to clean them out every so often?
 
  #6  
Old 08-18-19, 05:03 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 51,892
Received 256 Votes on 241 Posts
That would work and no.... I've never had to clean one out before.
 
  #7  
Old 08-18-19, 06:35 PM
Member
Thread Starter
Join Date: Jun 2014
Location: Canada, Quebec
Posts: 1,498
Upvotes: 0
Received 0 Votes on 0 Posts
What's the code requirement for size of pipe for the drip leg?
 
  #8  
Old 08-19-19, 02:14 PM
Member
Thread Starter
Join Date: Jun 2014
Location: Canada, Quebec
Posts: 1,498
Upvotes: 0
Received 0 Votes on 0 Posts
For example you connect flex pipe to threaded and then below the fixture do you have to add more threaded pipe?
 
  #9  
Old 08-20-19, 10:07 AM
Forum Topic Moderator
Join Date: Sep 2005
Location: USA
Posts: 4,599
Received 17 Votes on 16 Posts
I've never seen a drip leg on the end of a flexible pipe connected to an appliance. I've always figured they should be installed whenever possible, but when it's impossible (like a range), they aren't installed.

As for length, it seems to be a regional thing. Around here, it's usually a 6" nipple. Though I've seen as short as about 2" and longer than a foot.

The goal is to catch little flecks of metal or moisture. Even opening one after 40 years, it's doubtful you'd actually see anything fall out. But it's cheap insurance so you don't have to get stuck cleaning the burner orifices. I've never seen any actual research on how well they work, I may have to do some reading.
 
Reply

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
 
Ask a Question
Question Title:
Description:
Your question will be posted in: