Loud - gurgling - bathroom sink drain

Loud dripping noise echo after Vanity Drains

I have just got a new vanity installed, under the sink the drains are PVC with P Trap. When the tap is closed, there is laud dripping noise continue to come long after the tap is closed.
It seem water drop are dropping to a water pool and echo through the pipes. Can any one help??
regards
SA

SA - your "dripping" noise may actually be the sound of the pipe expanding against wood.

Nate R said:

I wonder what would happen if you used the 1 1/4" P trap that often comes with sinks instead of 1.5" ABS? I'm wondering if the size of the trap is making it much worse.

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Nate
This crossed my mind. In fact, I initially set out trying to install a 1 1/4" trap kit, but the stuff is so flimsy, so many joints with plastic insert seals. And I could not get a good coupling with the 1 1/2" ABS drain inlet in the wall.

So I switched to 1 1/2" abs for as far as I could. I find it is much more solid, joint wise.

The other curve ball is that I have basically the exact same setup in another bathroom. Same abs p trap, same tail pipe length. Only difference is the brand and dimensions of the sink. The sink is SILENT!

I think I am concluding that the noise is a combination of the actual sink design - how the faucet is positioned, how the water hits the sink and flows into the tail piece, etc. Also probably some unknown combination of vent pipe configuration, etc.


whatever, i'll live with it i suppose

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67stang said:

David
What are these elusive "other things" i can try?

thanks

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Loosen the slip joints and push the trap lower. (As I wrote in the immediately previous post.) Doing so will increase the height of the seal (the quantity of water sealing the trap). That may help. Push it 5 millimeters down.

David

geniescience said:

Loosen the slip joints and push the trap lower. (As I wrote in the immediately previous post.) Doing so will increase the height of the seal (the quantity of water sealing the trap). That may help. Push it 5 millimeters down.

David

Click to expand...

Just to clarify David's advice, you are not changing the drop from the sink to the top of the water in the trap, just the depth of the water in the trap which is established by the weir. You had a Q about this somewhere in the thread. I'm not sure it is possible, since it appears that the connection at the back of the trap is not compression.

also, you mentioned the tail piece is extended far into the trap - any chance it is interfering with the flow?

might also have air trapped between the compression ring and the top dip, outside the tail piece. (I'm betting on trapped air at the moment) shortening the tail should fix it. As a comparison, look at the joint where the two tails are connected. There is a seat (hub?) for them to meet, and no space between them.