(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 7 of 7

Thread: Max vertical distance out of p-trap before going into trap arm

  1. #1
    DIY Senior Member Hammerlane's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    252

    Default Max vertical distance out of p-trap before going into trap arm

    In the following photo disregard the dishwasher drain hose and address the vertical distance between the green lines.

    Is there a max vertical distance the water has to rise out of the trap before going into the trap arm?
    Attached Images Attached Images  

  2. #2
    DIY Senior Member Hammerlane's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    252

    Default

    I think ideally the setup should be like this: but wanted to know if there is a max height like on post #1
    Attached Images Attached Images  

  3. #3
    Homeowner
    Join Date
    Jan 2010
    Location
    Alabama
    Posts
    1,174
    Blog Entries
    1

    Default

    What your asking is the maximum trap seal. I believe the answer is 6"

    Thats from the bottom of the trap to the outlet.

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,633

    Default

    There is a "normal" max/min dimension, but in your case we CANNOT disregard the dishwasher drain because it is connected WITHIN the trap seal, so your dishwasher COULD siphon the trap seal into the dishwasher during every cycle after the water is discharged. Actually, none of the rest of the installation is proper anyway, because that appears to be a "vent tee" rather than a "center outlet baffle tee". I would take a SawZall to the whole thing and start over. Why is the horizontal line at that height. How about a picture from a little further away so we can see the entire system from the bottom of the sinks down.
    Licensed residential and commercial plumber

  5. #5
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    Location
    San Diego
    Posts
    9,001

    Default

    UPC 1005.0 says trap seal shall be 2" min 4" max unless a deeper seal is found to be necessary by the AHJ.

    As a practical matter, I believe experience tells us that a deep trap seal will drain more slowly. And as hj noted, the location of your DW tie in would be an absolute disaster.

  6. #6
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,633

    Default

    As a practical matter, a deep seal trap will drain almost, if not exactly, the same as a standard seal, unless you get ridiculous on the depth of the seal. The Tyler deep seal cast iron trap is 3 1/2" to 4" deeper than the conventional one. But, in this particular case, there is no need to go "deep seal" if it were plumbed correctly.
    Last edited by hj; 03-31-2012 at 02:08 PM.
    Licensed residential and commercial plumber

  7. #7
    DIY Senior Member Hammerlane's Avatar
    Join Date
    Oct 2011
    Location
    Ohio
    Posts
    252

    Default

    Quote Originally Posted by jimbo View Post
    UPC 1005.0 says trap seal shall be 2" min 4" max unless a deeper seal is found to be necessary by the AHJ.

    As a practical matter, I believe experience tells us that a deep trap seal will drain more slowly. And as hj noted, the location of your DW tie in would be an absolute disaster.
    Thanks Jimbo.

    And to the others: This is not my setup. Something I found online at another site and I was wondering about the height of that trap seal. The people on the other site were not providing answers so I figured I'd come here.
    Attached Images Attached Images  

Similar Threads

  1. Distance from fixture to roof vent stack layout review (not distance from p-trap)
    By kmuddzy in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 11
    Last Post: 12-01-2011, 10:21 AM
  2. vertical distance to p-trap for washing machine
    By sam. in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 4
    Last Post: 07-04-2011, 02:48 PM
  3. Minimum vertical distance from tub bottom to p-Trap inlet?
    By bagdanoj in forum Shower & bathtub Forum & Blog
    Replies: 1
    Last Post: 10-20-2009, 11:18 PM
  4. Can I offset the vertical pipe on a p trap?
    By ricka in forum Shower & bathtub Forum & Blog
    Replies: 8
    Last Post: 02-03-2007, 02:04 PM
  5. what is the max distance from p-trap to vent?
    By bhirt in forum Shower & bathtub Forum & Blog
    Replies: 1
    Last Post: 05-03-2005, 11:37 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •