DWV for a sink in an Island

[Larry Jackson]

I am planning to install a kitchen sink in an island. The dirty arm length is approx. 8( distance fron san-tee to island), I believe the code says a dirty arm cannot exceed 5.. Is this possible?

[Don HenriksonParticipant]

: I am planning to install a kitchen sink in an island. The dirty arm length is approx. 8( distance fron san-tee to island), : I believe the code says a dirty arm cannot exceed 5.. Is this possible?Don, The UPC Plumbing code reads: 60 inches for 2 pipe 42 inches for 1-1/2 pipeMost island sinks are run with a loop vent that has a foot vent added.Regards, Terry Love

[Don HenriksonParticipant]

I think trap arm length is a function of diameter at a specific slope. I think concept is that the trap wier must be below the top of the inlet to the stack. I have read several times that you can get around this by using a larger trap arm. Based on terrys figures, Im interpolating that a 4 arm can be 132, 3 – 99 – but this needs checking.Island loop or air admittance valve seem like likely solutions too.

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