Understanding International Plumbing Code Chapter 9 Sections 901 to 905

International Plumbing Code Chapter 9 is all about sanitary drainage systems. This video presentation covers IPC sections 901 to 905. Plumber-Tom explains what vents are, and the importance of having vents on drainage piping. These sections describe where vents are required, vent termination requirements, vent stack requirements and the slope of drainage vent piping.
This video is based on the 2021 International Plumbing Code, so chapter 9 might look a little different than previous or later versions of the code. Generally, the code requirements do not change much from one edition to the next.
To purchase a copy of Plumber-Tom's study companion published by Upstryve, click on this link: www.amazon.com/Journeyman-Plu...

[@quinwu]

May I ask why in the diagram showing at 15:36 does not provide vent for some of WC? I can see some WC and UR are using common vent, but some WC do not seem to have their own vents.

[@plumber-tom9470]

That is a good question. As I examine it, the probably should have vents or at least a dry vent serving as a circuit vent. Good eye.

[@vitorao]

The way I had previously learned about section 905.4 is different from what I haveundestood from 21:30 and forward of the video. I was taught that you can turn the pipe horizontally below the flood level rim. What was not allowed, as far as I learned before, was connecting it to the vent stack below 6 inches above the flood rim. In other words, you could turn the fixture vent horizontally below the flood level rim, then turn it vertical again until you reach 6 inches above the flood level rim and then connect it to the vent stack. If done this way, in the case of a drain blockage, the fixture would overflow before the waste reaches the height where the fixture vent connects to the vent stack and there will be no waste flow in the vent stack. Did I learn it wrong? Or is it possible to do the way that I have described (turning the fixture vent horizontal below the flood level rim and then turning it vertical again)?

[@plumber-tom9470]

I see. That may be permissible. I think it depends on how the code official interprets the code, and whether that would be approved. I have had some inspectors who would not allow that, but I imagine others would. This is where there can be some variable application depending on the local jurisdiction.
Thanks for watching the video! You obviously know plumbing!

[@vitorao]

@@plumber-tom9470, thanks for your answer. And thank you for posting these videos. It's very good to be able to learn from a experienced plumber how to apply code in practice.

[@scottyvigil1949]

Where do I find your test prep book?

[@plumber-tom9470]

There is a link in the comments.