# What is the thermal limit of Schedule 40 PVC pipe? [closed]

Can PVC pipes stand boiling water? I've tried searching online but the results vary.

• Think a better question would why you want to 3d print pipes? It is very slow, kind expensive to very expensive for long(more than six inchs) lengths. Commented May 15, 2022 at 13:57
• Pvc waste pipe on sinks takes boiling water when draing pasta… but not rated for use continuously under pressure. Commented May 15, 2022 at 15:22
• Related question diy.stackexchange.com/questions/88476/… Commented May 15, 2022 at 16:09
• @Solar Mike I think that regularly pouring two quarts of boiling water from cooking pasta into PVC or ABS drains is not a good idea, so I use a pasta ladle to pull the pasta out and then let the pasta water cool on the stove before pouring it down the drain. Of course, if one is a gourmet cook and time conscious, then this might be considered too slow and tedious. But I cannot bear the thought of damaging our ABS drains under the slab. My wife runs the cold water tap as she pours the pasta into a drain bowl, but I hate to waste the water. Is there a standard way to separate the pasta? Commented May 15, 2022 at 21:58
• @JimStewart they do make thos fancy sets with what's basically a colander that lines the pot. When it's done, yank it out of the pot leaving the water behind. Pasta insert seems to be the search term that works, if you want to bother. Commented May 15, 2022 at 22:03

Water boils at normal altitude of approximately 212 F (100C). Each different kind of polymer pipe has restrictions on temps regarding pressurized or non-pressurized.

PVC has a limit of about 140F (60C)

• How much boiling water is required to heat 10 feet of 2 inch schedule 40 pipe from 70 to 140 degrees, if the water passes through two feet of open air, a ceramic basin and 2 feet of polypropylene pipe first? Commented Dec 17, 2022 at 0:41
• "For intermittent flow, the fluid temperature can be higher due to the low thermal conductivity of PVC." - If you couldn't pour boiling water down the drain, everywhere I've ever lived now has leaks in it. Commented Dec 17, 2022 at 4:30

Boiling water is a standard way to soften PVC pipe for bending.

In short, no, utterly unsuitable for use as pipe with water anywhere near boiling.

3-D printing pipes seems highly unlikely to work, based on any 3-D prints I've seen. Perhaps if you have a bazillion-dollar sintered metal 3-D printer...

• It can work, but will depend on the type of plastic. My printer will do something like a coaster for glasses in a few(more than three) hours. Commented May 15, 2022 at 14:37