Thumping drain noise, no trap installed


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Old 08-20-10, 07:01 AM
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Thumping drain noise, no trap installed

I live on the top floor of a 3 story apt complex. My problem is a thumping noise coming from the a/c drain pipe. My guess is the a/c drains from other apts below me are connected to the same drain pipe and I'm hearing their condensation draining, causing a vacuum- or something along that idea. I do not see any trap installed in my drain line. I've included two photos.


One shows the drain and backup preventer pipes that exit the drain pan.


The other is shown from below, the pipes exit left and through the wall. It looks like someone may have removed a trap to get to the water heater.

I wonder if can simply install my own trap to eliminate the noise. The pipe looks to be 1/4 (not 1/2) inch. If this is possible, is there a certain height the trap needs to be? Thanks.
 
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Old 08-21-10, 08:57 AM
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id say go ahead and install one
 
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Old 08-21-10, 10:02 AM
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Size?

Thanks. Does the length of pipe matter? Say 3" long or longer?
 
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Old 08-22-10, 08:30 AM
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i wouldnt think it would matter
 
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Old 08-25-10, 08:59 AM
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the drain line is probably hooked to a condensate drian pump down below and when it kicks on it transfers the pump noise to the pipe, have the maintenance team investigate that. Vacuum would have to be tremendous to cause a thumping sound.
 
 

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