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Question DetailsAsked on 12/4/2017

will pvc kitchen sink pipe with compression fitting come apart if pour boiling water down it?

Asked about hot water, but need to know about boiling water since it is close to 212 degrees which hot water is in the low 100s.

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2 Answers


Sorry - in other post thought this coming apart was already happening with normal water temps. I would guess the heat is causing pipe expansion, loosening up the joints. Here are the rated operating temps for typical drain pipe materials:
ABS (the hard shiny black plastic commonly used for DWV (inside-house) drain lines - 100F pressurized, 180 unpressurized PVC (white or occasionally blue or green) - 100F pressurized, 140 unpressurized - it starts breaking down (decomposing) at 284F, so not much above boiling temp CPVC (hot water line pipe - looks like PVC but off-white or cream colored) - 180F both pressurized and unpressurized PVC (and styrene deriviatives like some hard white plastic under-sink componets for sale) can soften significantly in boiling waer - in fact, for gentle curved bends in PVC, boiling water and 160F hot air both work to soften it enough for bending, so I would not be surprised if leaks occur if you pour a lot of boiling hot water down the drain. To avoid damage - run cold water full flow from the faucet while pouring in the boiling water (like water in pot from boiling eggs, cooking spaghetti, etc) or put in sink (if not plastic sink) and run cold water into the pot until it cools down (as it overflows) - or let cool on stove before pouring into sink. A small amount should not be a problem - but a full big pot full or full coffee pot full, maybe so. Also - when pouring real hot water into sink - avoid the side with the garbage disposal, if you have one - no need to put extreme conditions on the seals in that.

Answered 2 years ago by LCD


BTW - I forgot about the bevel gasket / O-ring - with compression fittings the seal or gasket which the nut tightens down around the pipe is usually silicone based, which I am sure would give out at an even lower temp than the pipe itself.

Answered 2 years ago by LCD

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