P-trap operational limits ??

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by SH140, May 28, 2013.

  1. SH140

    SH140 New Member

    Jan 31, 2013
    Vallejo, Ca.
    Getting ready to install plumbing for new tub install, and wanted to know ahead of time if there are any limitations when installing the p-trap. I know that the standard trap is a fairly tight radius. If need be, could a trap be made with two 90o elbows with a straight connecting pipe at the bottom ? if so how long can connecting pipe be so that the trap still functions correctly? (1", 3", 12" ???) If not, is it because the trap operates more efficiently with a tight turn in a shorter length?

    Also, where there will be no access to the plumbing after the tub goes in, is it better to use only glued joints in the ABS plumbing?

  2. kreemoweet

    kreemoweet Member

    Sep 7, 2009
    Seattle. WA
    Built-up p-traps are generally made up of a 90 plus street 90. The short bend promotes "scouring", so sediment and deposits are minimized in the bend. The plumbing
    codes REQUIRE no-access drains to be made up of glued (solvent-welded) or other approved joints.
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