Kitchen Drain Pipe Loop - 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 06-30-2011, 06:17 PM   #1
Newbie
 
Join Date: Jun 2011
Posts: 3
Rewards Points: 10
Default

Kitchen Drain Pipe Loop


I removed a half wall when I remodeled my kitchen. The sink drain pipe was inside this wall. The drain went through the floor, but it also had a high loop in it, looping back on itself (about a 3-foot high loop). I assume this loop relieves air pressure in the pipe . I am now in the process of rerunning the drain from the new sink location. My question is, can I simply run the drain through the floor to the existing drain pipe, or do I need to create a loop? Thanks...

Tim

Advertisement

tpsilk is offline   Reply With Quote
Old 06-30-2011, 07:14 PM   #2
Plumber/Contractor
 
TheEplumber's Avatar
 
Join Date: Jul 2010
Location: North Idaho
Posts: 7,251
Rewards Points: 2,618
Default

Kitchen Drain Pipe Loop


Sounds like an island vent- see picture
You need to keep it, either in the wall or inside the cabinet.
In my area I can now use a mech vent(AAV), but only at island sink locations. You might consider the same, but do not just hook the trap to the drain line. That create an "s" trap which is prone to self siphoning, therefore, not allowed any more
Attached Images
 

Advertisement

TheEplumber is online now   Reply With Quote
Old 06-30-2011, 11:40 PM   #3
Newbie
 
Join Date: Jun 2011
Posts: 3
Rewards Points: 10
Default

Kitchen Drain Pipe Loop


Thanks...that's it except there is no connection to an air vent and the pipe loops back on itself, connecting to a single 90 degree elbow on the drain pipe in the floor. I don't see any air vent at all. There was an air gap in the sink for the dishwasher, but we don't have one with in the new sink. Does it make sense to have no true vent and just a loop?
tpsilk is offline   Reply With Quote
Old 07-01-2011, 10:04 AM   #4
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

Kitchen Drain Pipe Loop


Quote:
Originally Posted by tpsilk View Post
Thanks...that's it except there is no connection to an air vent and the pipe loops back on itself, connecting to a single 90 degree elbow on the drain pipe in the floor. I don't see any air vent at all. There was an air gap in the sink for the dishwasher, but we don't have one with in the new sink. Does it make sense to have no true vent and just a loop?
I've seen situations like this before where people have seen plumbers put in a loop vent, and try to duplicate it, but i think it's just too hard for some people to figure out.

The loop you're describing makes no sense. There isn't another pathway for the air to follow, so it's a useless waste of fittings.

The one shown in the picture above is the way to do a true loop vent. Check your local code, you may be able to use an air admittance valve, as suggested above.
__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 07-02-2011, 08:56 AM   #5
Newbie
 
Join Date: Jun 2011
Posts: 3
Rewards Points: 10
Default

Kitchen Drain Pipe Loop


Here is a picture of what was there.
Attached Images
 
tpsilk is offline   Reply With Quote
Reply

Tags
kitchen drain


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
Need to close off or move a vent pipe & drain that goes to nothing mystic_cobra Plumbing 2 04-18-2011 09:14 PM
Removing kitchen drain pipe from wall diyrocks Plumbing 8 02-28-2011 02:37 PM
AC Coil drain pipe questions fritzycat1 HVAC 14 11-12-2010 04:51 PM
Kitchen Sink Moved - new kitchen sleepysmurf Plumbing 1 08-10-2010 07:38 AM
drain pipe size for kitchen sink, garbage disposal, and dishwasher ? amakarevic Plumbing 5 08-05-2007 01:23 AM




Top of Page | View New Posts