Hello Guillermo I note that ...

Hello Guillermo

I note that Leak Noise correlation has been mentioned in one answer, you are also able to use this utilising hydrophones within the water flow as the plastic materials are not good for noise transmission. From my experience leaks on plastic pipes tend to be on the joints which have s gasket in them. The can be repaired by cutting out the joints and replacing with a small section of pipe with mechanical repair collars. However some PVC pipes in the past were manufactured and the compounds tended to create a brittle pipe which could easily crack and break if not laid and bedded correctly, this was corrected with the development of new standards some years ago.

Hope this helps

Ashley