Trap outlet same level as disposal outlet

Discussion in 'Plumbing Building Code' started by dave80906, Oct 19, 2013.

Help Support Plumbing Forums by donating using the link above.
  1. Oct 19, 2013 #1

    dave80906

    dave80906

    dave80906

    New Member

    Joined:
    Oct 19, 2013
    Messages:
    3
    Likes Received:
    0
    Location:
    ,
    Is it against code or otherwise ill-advised to have the discharge end of the p-trap at the same level as the discharge port of the disposal? Seems like that might result in water standing in the disposal.
     
  2. Oct 19, 2013 #2

    johnjh2o

    johnjh2o

    johnjh2o

    Senior Member Professional

    Joined:
    Jul 21, 2011
    Messages:
    3,205
    Likes Received:
    733
    Location:
    Melbourne, Florida
    Is it at the same height as the disposal outlet or the bottom of the outlet ell on the disposal? It can be piped without using the outlet ell. A picture would help.
     
  3. Oct 20, 2013 #3

    dave80906

    dave80906

    dave80906

    New Member

    Joined:
    Oct 19, 2013
    Messages:
    3
    Likes Received:
    0
    Location:
    ,
    It is close to the same level as the outlet itself, maybe 1/4" lower.

    IMAG1141.jpg
     
  4. Oct 20, 2013 #4

    johnjh2o

    johnjh2o

    johnjh2o

    Senior Member Professional

    Joined:
    Jul 21, 2011
    Messages:
    3,205
    Likes Received:
    733
    Location:
    Melbourne, Florida
    It looks like if you shorten up the disposal ell, you could use a standard tubular trap without the extension between the two sections of the trap.
     
  5. Oct 21, 2013 #5

    dave80906

    dave80906

    dave80906

    New Member

    Joined:
    Oct 19, 2013
    Messages:
    3
    Likes Received:
    0
    Location:
    ,
    It does look that way, but the extension that slips over the ell won't go up high enough to allow that. My bigger concern was just whether the tap into the vertical drain pipe in the wall being virtually as high as the disposal outlet would create a problem.
     
  6. Oct 24, 2013 #6

    phishfood

    phishfood

    phishfood

    Well-Known Member Supporting Member

    Joined:
    Jan 18, 2010
    Messages:
    5,683
    Likes Received:
    965
    Location:
    Orlando, FL
    As long as the disposal outlet is even the slightest bit higher than the trap arm, the disposal will drain completely. Which is what you want to happen, you don't want the disposal to retain water.
     
  7. Oct 30, 2013 #7

    camaroderrick73

    camaroderrick73

    camaroderrick73

    Professional Professional

    Joined:
    Apr 14, 2013
    Messages:
    152
    Likes Received:
    30
    Location:
    Sacramento, California
    Code says 2 to 4 in only at the weir of the trap.. Technically .. That is ok
     
  8. Oct 30, 2013 #8

    camaroderrick73

    camaroderrick73

    camaroderrick73

    Professional Professional

    Joined:
    Apr 14, 2013
    Messages:
    152
    Likes Received:
    30
    Location:
    Sacramento, California
    This is prime example that people need to explore all options before putting in a deep basin sink. Also... No air gap?
     
  9. Mar 6, 2014 #9

    SHR

    SHR

    SHR

    Member Professional

    Joined:
    Mar 5, 2014
    Messages:
    617
    Likes Received:
    288
    Location:
    , Minnesota
    I am not a fan of air gaps, often they fail and leak causing water damage. Fortunately, inspectors in my area do not require them. BUT raise the dishwasher drain line up the the bottom of the countertop and secure it there. Otherwise you will often find ground up food particles in the bottom of your dishwasher...ick!

    I would be very concerned about the flexible tube used to raise and connect the trap to the wall tube. Now that is a code violation in my area. NEVER ever use flexible corrugated tubular drainage parts. They are disasters waiting to happen and just not the right way to plumb a sink drain. Eliminate that part!

    Edit: I now realize dave80906 did probably use a regular extension tube. Oops, sorry.
     
    Last edited: Mar 6, 2014
  10. Mar 6, 2014 #10

    phishfood

    phishfood

    phishfood

    Well-Known Member Supporting Member

    Joined:
    Jan 18, 2010
    Messages:
    5,683
    Likes Received:
    965
    Location:
    Orlando, FL
    I took that to be a standard slip joint extension tube. It could be a flexible connector, hard for me to tell from the picture.
     
  11. Mar 6, 2014 #11

    SHR

    SHR

    SHR

    Member Professional

    Joined:
    Mar 5, 2014
    Messages:
    617
    Likes Received:
    288
    Location:
    , Minnesota
    Upon looking at the pic closely a third time, I think you are correct. Never mind.
     
    Last edited: Mar 6, 2014
    phishfood likes this.
  12. Mar 8, 2014 #12

    plumbdrum

    plumbdrum

    plumbdrum

    Well-Known Member Lifetime Supporter

    Joined:
    Feb 7, 2014
    Messages:
    52
    Likes Received:
    17
    Location:
    ,
    You already have a hole in your wall, why don't open it up and make it a proper installation with the correct rough in height and a full size clean out .


    Sent from my iPhone using Plumbing Forum
     
    SHR likes this.
  13. May 1, 2014 #13

    flplumbing

    flplumbing

    flplumbing

    New Member

    Joined:
    Nov 9, 2013
    Messages:
    2
    Likes Received:
    0
    Location:
    ,
    I have seen a violation code with the dishwasher drain according to the code need an air gap to prevent pump lose the prime

    No links in posts, please
     
    Last edited by a moderator: May 2, 2014
  14. May 1, 2014 #14

    johnjh2o

    johnjh2o

    johnjh2o

    Senior Member Professional

    Joined:
    Jul 21, 2011
    Messages:
    3,205
    Likes Received:
    733
    Location:
    Melbourne, Florida
    I have never heard of a dishwasher pump that needs to be primed.
     
    journeyman and SHR like this.
  15. May 1, 2014 #15

    SHR

    SHR

    SHR

    Member Professional

    Joined:
    Mar 5, 2014
    Messages:
    617
    Likes Received:
    288
    Location:
    , Minnesota
    Nonsense. Air gaps help prevent backflow of waste water back in to the dishwasher. They have nothing to do with priming any pump. Johnjh20, I agree with you, dishwasher pumps do not need to be primed.

    Removed improper link in quoted post
     
    Last edited by a moderator: May 2, 2014
    phishfood and frodo like this.
  16. May 2, 2014 #16

    journeyman

    journeyman

    journeyman

    the professional

    Joined:
    Oct 4, 2012
    Messages:
    471
    Likes Received:
    150
    Location:
    san diego, california
    If you have an airgap that is spitting water than you have an issue. If working properly you should not see water. Usually the discharge hose to the disposal is clogged causing water to come out of air gap. Air gaps are code. New dishwashers are suppose to have check valves to prevent backwater but i would not trust that. If water gets back into diswasher it could flood your floor
     
  17. Oct 2, 2014 #17

    frodo

    frodo

    frodo

    Just call me Macgyver Professional

    Joined:
    Sep 28, 2014
    Messages:
    5,900
    Likes Received:
    1,843
    Location:
    ,
    , every municipality i have worked in, looks the other way, if you strap your hose to the bottom of the counter top.

    if a different disposal 90 does not work inconjunction
    with a ptrap with out an extension.

    lower the san tee in the wall, add a co
     
  18. Oct 2, 2014 #18

    frodo

    frodo

    frodo

    Just call me Macgyver Professional

    Joined:
    Sep 28, 2014
    Messages:
    5,900
    Likes Received:
    1,843
    Location:
    ,
    agree+100%
     
    SHR likes this.

Share This Page