Standpipe Vents

[Rich Kinas]

Hey all,

While I am working on the interior and roof, I have to do some work on the standpipe that vents the bathroom sink, the pipe that snakes up beside the
frig . So I was looking at it and wondering something. I understand why this standpipe is needed base on the original design layout where the bathroom
sink trap ties into the bathroom standpipe then about 6 inches below this "T" the pipe travels over to the toilet standpipe and "T's" into that pipe.
However I was wondering if I just ran the bathroom sink trap output directly to the toilet standpipe "T" shouldn't this work just as good? This would
allow me to remove the existing sink standpipe and a lot of extra pipe, and allow me to reclaim another 4 inches of space between the bathroom module
and the frig module. Also it allows me to close up another roof penetration point

Thanks again...
--
Rich Kinas
1976 Elaganza II
Orlando, FL

 

[Ken H.]

Rich,

One little problem you may encounter with combining the bath sink vent with
that for the toilet is not immediately obvious: During long idle periods,
the sink trap will tend to dry out. That may allow noxious odors into the
coach. You may be conscientious enough to periodically refill the trap, or
to always fill it with a non-evaporating antifreeze or similar, but most
probably aren't.

One thing you may want to consider while doing all that plumbing is the use
of the newer "traps" which don't require water and occupy less space than
the older J-traps. I'm giving you advice here about something I don't have
any personal knowledge about though -- someone here can probably offer
experience.

Ken H.

On Tue, Sep 3, 2019 at 4:44 PM Rich Kinas via Gmclist <

> Hey all,
>
> While I am working on the interior and roof, I have to do some work on the
> standpipe that vents the bathroom sink, the pipe that snakes up beside the
> frig . So I was looking at it and wondering something. I understand why
> this standpipe is needed base on the original design layout where the
> bathroom
> sink trap ties into the bathroom standpipe then about 6 inches below this
> "T" the pipe travels over to the toilet standpipe and "T's" into that pipe.
> However I was wondering if I just ran the bathroom sink trap output
> directly to the toilet standpipe "T" shouldn't this work just as good? This
> would
> allow me to remove the existing sink standpipe and a lot of extra pipe,
> and allow me to reclaim another 4 inches of space between the bathroom
> module
> and the frig module. Also it allows me to close up another roof
> penetration point
>
> Thanks again...
> --
> Rich Kinas
> 1976 Elaganza II
> Orlando, FL
>
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[LarryW]

Here is another way of handling the drain traps. Does a nice job of making more usable space under sinks. JWID

http://www.gmcmhphotos.com/photos/g6929-sink-trap.html
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.

 

[Rich Kinas]

Ken, I did think about the trap drying out, but figured this would be no worse than I have right now, since if the sink trap dries out there is a
direct open air path to the black water tank, currently.

Larry, good idea on moving the trap to the back wall to provide more usable room under the sink.

Rich
--
Rich Kinas
1976 Elaganza II
Orlando, FL

 

[justin brady1]

I removed both of mine. Both sink and bathroom sink drain through a hepvo valve with no traps.
No smells of any kind.
--
Justin Brady
http://www.thegmcrv.com/
1976 Palm Beach 455

 

[Rich Kinas]

Wow I have to remember to search for new options for our coaches. The HEPvO seems like a no-brainer. Time to switch. Thanks for the awesome
suggestion!
Rich
--
Rich Kinas
1976 Elaganza II
Orlando, FL

 

[Richard RV]

I've installed one Hepvo under the kitchen sink so far, two more to go. Great option, picked up some space, no winterizing, little annoying flies no
longer using the team as a watering hole. Coachmen had to cut the plywood floor to fit the P-trap under the rear bath tub in the Birchaven. Not a
great idea to expose a low hanging water trap to the outside air. . That's up next.

Richard
--
'77 Birchaven TZE...777

 

[kab7]

We used an air admittance valve in place of that pipe next to the fridge for the same reason.
It sits just under the sink counter, higher than the drain.

Karen
1975 26'

 

[michael1]

I plan to install 3 Hepvo Valves (Kitchen, Bath and Shower Drain) and use only 1 standpipe vent.
I just need to find time....
--
1973 GMC 26' Glacier - Unknown Mileage - Has a new switch pitch transmission with Powerdrive