vent stack question -

[LanggamanXavierMassed]

This might be a bit non Autocad question but, I am working on an isometric view for a plumbing layout under a firm here in the Philippines, So I needed to refer the firm's drafting standard by opening another project, and what I notice is that a sewer line layout of a 3-storey building does not have vent pipes, even in their isometric view, do 3-storey buildings really do not need venting pipes in their sanitary plumbing system? thank you i'm just a bit puzzled.

[LanggamanXavierMassed]

though looking at their multi-level condominium building file, they do have vent pipes in their plumbing layout. thnks

[S.Faris]

This question can be better answered by your MEP MANAGER(if there is one) or your Locally working fellow colleagues.

[ennujozlagam]

Are you referring to the P - trap? Yes, they should have the vent for the reason that vent pipe control the smells/odors to come from other floors. Thanks

[LanggamanXavierMassed]

yes it is, but I'm posting because i can't do that right now,  they are all not here and I a bit worried to bother texting them in the site haha. have a great day

[S.Faris]

I get it. Most of us get into these kind of situations every now and then. I just suggested it, thinking that it might save you some time.

Hope someone here can help you with this.

[Pointdump]

Xavier,
"do 3-storey buildings...need venting pipes in their sanitary plumbing system?"
Yes. But since you can't predict how the plumber will tie them together to minimize roof penetrations, just show them going up a bit.

Dave