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-   -   "S" trap (http://www.diychatroom.com/f7/s-trap-21926/)

BillyD 06-06-2008 06:02 PM

"S" trap
 
Is syphon the only problem with using "S" traps?
Thanks

Ron The Plumber 06-06-2008 06:40 PM

Yep, no one likes the smell of sewer gases.

Termite 06-06-2008 08:50 PM

I don't like seeing them. Sewer gas is definately the issue. That type of trap setup has the potential of sucking just enough water out of the trap to allow sewer gas to pass. This is a common setup, and problem, with clothes washing machine drains. The water velocity and volume only works against the trap, and increases the possibility of it siphoning itself "dry".

For a 2" drain, you're supposed to have a 4" section of horizontal pipe between the trap and the downstream vertical run. 1-1/2" would require 3", and so on.

Alan 06-07-2008 01:53 AM

Quote:

Originally Posted by thekctermite (Post 128486)
For a 2" drain, you're supposed to have a 4" section of horizontal pipe between the trap and the downstream vertical run. 1-1/2" would require 3", and so on.

Now that you bring that up, i'd like to hear exactly how YOU would measure said 4" section, because technically, if you put a 2" p-trap, and a 2x1-1/2x2 sanitary tee hub-to-hub, there is 4 inches between the vent and the trap weir, making it impossible to have too short of a horizontal piece anyway. :huh:

This is often a subject of debate at school.

Termite 06-07-2008 06:26 PM

Alan,
Putting them hub to hub is the problem in my opinion. So, I'd require a 4" nipple or section of PVC between the two hubs horizontally, on 2" pipe. I'm not measuring wier to wier. The inherent "s" shape is what should be avoided, especially at the clothes washer, which discharges with great velocity and volume.

This is definately a subject with a lot of debate and opinions vary. :whistling2:


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