Hot water makes PVC "pulse"


  #1  
Old 04-30-07, 05:40 AM
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Hot water makes PVC "pulse"

In my basement bathroom sink, if the temp outside is below 50-60 degrees, when I use the hot water the PVC drain pipes do a rhythmic little pop/pulse every few seconds. This happens with hot water only, not cold.

What's up?
 
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Old 04-30-07, 08:09 AM
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Sounds like (no pun intended) themal expansion of the piping.
 
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Old 04-30-07, 11:20 AM
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Is that a problem?
 
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Old 04-30-07, 04:11 PM
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Usually not. When piping is installed it should be tight enough in the hangers/straps to not rattle but loose enough to move on expansion and contraction. Plastic pipe "moves" (expands and contracts) a bit more than metal pipe and if the hangers and straps are too tight it will groan and wheeze while moving.
 
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Old 05-01-07, 06:27 AM
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Ok, cool, thanks.
 
 

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