Ptrap vertical distance.

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Nanmer, Aug 2, 2017.

  1. Nanmer

    Nanmer New Member

    Joined:
    Aug 2, 2017
    Location:
    Texas
    Hello all thanks for having me here. In the ipc code. It states ptrap cant be more than 24 inches from outlet of fixture to wier of trap. Can it be more than 2 feet if your using trap primers? Im in San Antonio, Texas. Tia.
     
  2. cwhyu2

    cwhyu2 Consultant

    Joined:
    Aug 11, 2007
    Occupation:
    Consultant
    Location:
    Cincinnati OH
    Is this for a floor drain?Or a fixture trap.
     
  3. Sponsor

    Sponsor Paid Advertisement

     
  4. hj

    hj Master Plumber

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    That would NOT be a "normal installation" for a fixture trap.
     
  5. Nanmer

    Nanmer New Member

    Joined:
    Aug 2, 2017
    Location:
    Texas
    Mods please delete this post. I double posted.
     
    Last edited: Aug 2, 2017
  6. Nanmer

    Nanmer New Member

    Joined:
    Aug 2, 2017
    Location:
    Texas
    Floor drain
     
  7. cwhyu2

    cwhyu2 Consultant

    Joined:
    Aug 11, 2007
    Occupation:
    Consultant
    Location:
    Cincinnati OH
    Then yes you can go more than 24 inches for floor drains 3 inch or larger.
     
  8. Nanmer

    Nanmer New Member

    Joined:
    Aug 2, 2017
    Location:
    Texas
    If its 2 inch no? Also is it written in the ipc code book? I couldn't find it.
     
  9. cwhyu2

    cwhyu2 Consultant

    Joined:
    Aug 11, 2007
    Occupation:
    Consultant
    Location:
    Cincinnati OH
    I should have said for traps 3 inch or larger I believe you may be able to reduce to 2 inch on the inlet side of the trap.
     
  10. Nanmer

    Nanmer New Member

    Joined:
    Aug 2, 2017
    Location:
    Texas
    I see. So if it has no trap primers then the 24 inch code applies.
     
  11. cwhyu2

    cwhyu2 Consultant

    Joined:
    Aug 11, 2007
    Occupation:
    Consultant
    Location:
    Cincinnati OH
    The trap primer does not determine the length of the trap inlet so if your trap is 3 inch or larger you can have the inlet side of the trap longer than 24 inches.
     
  12. Nanmer

    Nanmer New Member

    Joined:
    Aug 2, 2017
    Location:
    Texas
    The ipc code states: The vertical distance from the fixture outlet to the trap weir shall not exceed 24 inches. Yet your telling me if the trap is 3 inches or larger it can be longer than 24 inches. That contradicts the ipc code. Where are you finding this? I done see it in the code book.
     
  13. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    In a straight drop, gravity can let the water velocity get high enough that the it can potentially have enough inertia to empty the trap if that fall is too great. While I may be wrong, I think that's the reason they limit the length of the drop to the trap. Once the waste is past the trap, as long as it is vented properly, it can't go fast enough to empty the trap. The size of the pipe doesn't matter...gravity works the same in a 2" pipe as it does in one larger or smaller.
     
  14. Nanmer

    Nanmer New Member

    Joined:
    Aug 2, 2017
    Location:
    Texas
    Thats the way I understand it. If the vertical is greater than 24 inches then you risk the water creating the seal being sucked out of the ptrap. But cwhyu2 is saying other wise. All I want to know is if the trap has a trap primer if that would exempt it from that rule. If you say it does then where in the code book does it state that.
     
Similar Threads: Ptrap vertical
Forum Title Date
Plumbing Forum, Professional & DIY Advice Min distance from bottom of sink to pTrap May 30, 2020
Plumbing Forum, Professional & DIY Advice Ptrap won't fit in vanity cabinet suggestions? Jan 16, 2020
Plumbing Forum, Professional & DIY Advice 3/4 PVC pipe near Ptrap Jan 15, 2020
Plumbing Forum, Professional & DIY Advice Old Bathtub Remodel 2” Copper with 2” ptrap Dec 28, 2018
Plumbing Forum, Professional & DIY Advice Low profile ptrap for saniflo system Oct 23, 2018

Share This Page