Talk:Plumbing drainage venting

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[edit] Rewriting

The original article seemed a little difficult to read. I tore it apart and rewrote it to be a little shorter and clearer.

It also seemed to be a sales pitch for air admittance valves, which I'd never heard of before. I suspect most people are more familiar with the stack-on-the-roof sewer vent, so I wrote the article more around those, and left the AAV link if people want more information.

Finally, a picture of a residential building with a sewer vent would be very useful, as would a diagram of a vent, two traps, and sewer line. --Mdwyer 19:48, 2 October 2005 (UTC)

  • Agreed. If I had artistic skill, I'd do the drawing. There's a Home Depot book with some wonderful graphics, I'll see if they'd be willing to let it be used (for credit: "Wikipedia's use of this image has been graciously donated by Home Depot" or similar). (Bob Nardelli owes me a favor, so what the hell.) --Yiddophile 03:12, 24 November 2006 (UTC)

Someone has rewritten my rewrite. I think it is good enough to remove the banner from the top, so I am going to do just that. I'm also going to integrate the HepvO product into the article a little more so it doesn't look so tacked-on.--Mdwyer 19:44, 28 November 2005 (UTC)

[edit] Merging and Cleanup

I have removed the suggestion of a merge to Domestic water system, because this topic is more generally applicable than to just that system. I have merged in the content of Air-admittance valve. I have also begun the process of wikifying this article. -- kaosfere 18:25, 27 July 2006 (UTC)

[edit] Air admittance valve?

The "Venting to atmosphere" section is great! Of course, diagrams and picutres would make it even better... But the "Air admittance valve" section does not make sense -- if it only allows gases in, not out, how does it prevent back-pressure when a toilet flushes?69.87.193.156 13:05, 6 September 2006 (UTC)

  • It doesn't. This, and its requirement for maintenance, are a couple of the reasons they're not liked by some (ahem... a lot of) building codes. In general, though, positive pressure isn't as big a deal as negative pressure - positive pressure means small amounts of sewer gas entry (bubbles in the toilet bowl) or just that the water in the P-traps rises momentarily. Negative pressure siphons out P-traps, resulting in a wide open source of yummy sewer gases. So yeah, you flush the toilet and the pipe goes through positive pressure as you displace your goodies (AAV not doing anything to help you) and negative pressure as that column of water falls down the pipe (AAV opens and prevents siphoning of P-traps). Since they do 50% of the job *and* require maintenance (replacement every 5 years or so), they rank alongside MJ clamps as the last refuges of the damned. Yiddophile 03:08, 24 November 2006 (UTC)
    • AAV devices aren't meant to replace a vent system that terminates at the roof. AAV's are used when proper venting is either impossible or impractical. For example, in most of the houses I've roughed in, the kitchen sink is either centered on a window or out in the middle of the room under a bar. For a kitchen sink with a window, the window is framed with several 2x4 studs and codes limit the number of studs you can drill through (for me its two). With a bar rough in, you can't carry your vent pipe up either. You can't lay over the pipe horizontally either since you must be over the flood rim of the fixture before you can do that. I also put in two AAVs for a bar that is centered in the middle of a restuarant to vent the floor sinks there. Jmricker 22:05, 11 September 2007 (UTC)

[edit] Cleanup of plumbing articles

FYI -- I'm cleaning up/organizing the plumbing articles. 129.237.114.171 18:43, 27 November 2006 (UTC)

[edit] Flashing?

The article uses "flashing" in the sense of a one-way valve, which is usually an integral part of the "building clean-out". No definition of flashing in this sense exists in the Wikipedia. I would like to change the word flashing to "one-way valve", and include a link to the article for "clean-out", if one exists. --chollapete, May, 2006.—The preceding unsigned comment was added by Chollapete (talk • contribs) 21:35, 9 May 2007 (UTC).