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Author:
takeadoe (OH)
Good morning,
My apologies for wearing out my welcome, but I'm still not sure on how to proceed with this venting issue. In my earlier post "Venting a Laundry Tray Pump" folks there was some good discussion on the topic, but I'm still not sure of a two things:
1) how does NO p-trap between sink and pump eliminate the need for a vent?
2) The role of the p-trap is to prevent odors from entering the house from the pump. If there is no odor, then there is no need for the trap. Right?
3) The pump will contain some air. For discharge from sink to enter pump, the air in pump must go somewhere. Correct? If "yes", where will the air go without a vent?
My plan is to put a 6-8' pipe in the vent port to handle and suds that might accumulate. If I do that, do I need the p-trap? If yes, why? If no, why?
Thanks!
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Author:
m & m (MD)
I always install a trap on laundry pumps (and a vent too). For one thing, the setup is conducive for a trap with a horizontal coonection on the sump. If you've never smelled decaying laundry waste, it can be as stomach turning as sewage odor.
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Author:
hj (AZ)
1) how does NO p-trap between sink and pump eliminate the need for a vent?
2) The role of the p-trap is to prevent odors from entering the house from the pump. If there is no odor, then there is no need for the trap. Right?
3) The pump will contain some air. For discharge from sink to enter pump, the air in pump must go somewhere. Correct? If "yes", where will the air go without a vent?
1. The "drop pipe/tailpiece" is never "full" of water so the air exits while the water is draining down the same pipe
2. Also, if there is no air circulation there are no odors
3.True. In fact, many, if not all, "sump pumps" do NOT have a sealed cover so they do not need vents.
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Author:
takeadoe (OH)
Thanks to all. "hj", thank you for pointing out the fact that the tailpiece is never full of water, which allows it serve as a "part-time" vent as well!
Mike
Edited 1 times.
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