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Question DetailsAsked on 12/2/2017

why does pvc kitchen sink pipe comes apart after pouring hot water down?

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Because it is put together wrong ?


If a glued joint, then either you (or the plumber) failed to clean and prep the pipe with cleaning solvent before gluing it, it did not get glued at all, or the glue type was wrong for the type of pipe.


If a compression fitting (with big plastic nuts holding the joints together, then several possible causes again:


1) nut is cracked so it is not holding tight


2) pieces are missing - normally you will have one piece of pipe with the male thread on the end, then a rubber/silicone gasket that goes between the two pieces of pipe (omitted in some types of pipe joints - the bevel washer does it all), then the second piece of pipe coming into the joint which has a boss or enlarged end flare on it, then a tapered gasket ring (usually translucent nylon) which goes between the flare and the nut, then the nut.


3) gasket is in backwards so the flare faces the wrong way


4) pieces were assembled in wrong order for the nut is on the same piece of pipe as the male thread, so it is just tightening onto the thread but not pulling the other pice of pipe up tight up against the end of it


5) nut totally missing - you would not believe how many tinmes I have seen the drain pipe just stuck up inside the outlet of a sink or tub - because he forgot to put it and the sealing ring onto the pipe before gluing it in place, or because the sink outlet was non-standard (pretty common with imports) so the standard nut did not fit.


6) if connection to sink itself is coming apart, the "banjo" or "retaining collar" ring which is on the pipe below its end fitting, and screws/bolts/threads onto the bottom of the sink, is loose or missing so the pipe is not snugged up tight to the sink outlet.


Here is what a typical compression connection for drain from a sink/basin looks like - to the trap, and the second on for several common connections to sinks themselves:


http://acertiscloud.com/removing-a-ki...


https://www.practicaldiy.com/plumbing...


if those did not help google for sink trap or sink connection Youtube videos - you should be able to find one with your type connection pretty easy - or look at Plumbshop or FluidMaster or Home Depot websites for how-to instructions for their plumbing kits for under-sink applications.


That failing, Plumbing is of course the Search the List category to find a plumber to set it right for you.

Answered 11 months ago by LCD




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