Home » Public Forums » GMCnet » [GMCnet] Sewer vents. How complicated can that be. RIGHT.
| [GMCnet] Sewer vents. How complicated can that be. RIGHT. [message #295206] |
Mon, 08 February 2016 00:45  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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I'm not into sewer venting in an RV. And I'm somewhat knowledgeable about residential venting. Basically I know enough to be dangerous. The mouse house gray water tank has two drain lines going into the top of the tank. Both drain lines have have 1.5 inch vents teed into those lines. The black water tank had an 1.5 inch vent line that tied into the gray water tank vent. I understand why a large vent is needed for a standard residential toilet. But an RV toilet flushes in a much different manner. And with much less water volume. So I need to figure out just how small a vent line I can get away with for the black water tank. And I mean seriously small vent. The rear drive in shower is 42 by 57 inches. The shower, bath, and kitchen sink will all go into the gray water tank. And I know that some gray water should go into the black water tank. But that's just not possible. That issue I can work around.Bob Dunahugh78 Royale.
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| Re: [GMCnet] Sewer vents. How complicated can that be. RIGHT. [message #295232 is a reply to message #295206] |
Mon, 08 February 2016 09:51  |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Hi, Bob.
Well, I am NOT a plumber, but if I were basically starting from scratch where you are,
I would install a SEPARATE vent for the black water tank! I am also a firm believer in
the wind-sensing (think weather vane) venturi vent for the outlet of that vent pipe.
They are available at almost any RV supply outlet.
This device provides a lower pressure at the "downwind" outlet and will suck out
sewage fumes from the black tank. Even if there is ZERO wind, the lighter-than-air
sewage gases will exit UP the pipe. Remember that if you break wind, it's aimed at
the floor, but it still hits you in the nose!
You also have to remember to not have any bathroom exhaust fan running when you
flush your "stuff" down into the holding tank! HAR!!!
The contents of the "gray" tank can also develop a stench, even if it isn't as bad as
what's in the "black" tank. That's why I'd also add the "weather vane" to a grey tank.
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ Since 30 November '53 ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ Member GMCMI and Classics ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
|[ ]~~~[][ ][]\
"--OO--[]---O-"
> From: yenko108@hotmail.com
> To: gmclist@list.gmcnet.org
> Date: Mon, 8 Feb 2016 00:45:30 -0600
> Subject: [GMCnet] Sewer vents. How complicated can that be. RIGHT.
>
> I'm not into sewer venting in an RV. And I'm somewhat knowledgeable about residential venting. Basically I know enough to be dangerous. The mouse house gray water tank has two drain lines going into the top of the tank. Both drain lines have have 1.5 inch vents teed into those lines. The black water tank had an 1.5 inch vent line that tied into the gray water tank vent. I understand why a large vent is needed for a standard residential toilet. But an RV toilet flushes in a much different manner. And with much less water volume. So I need to figure out just how small a vent line I can get away with for the black water tank. And I mean seriously small vent. The rear drive in shower is 42 by 57 inches. The shower, bath, and kitchen sink will all go into the gray water tank. And I know that some gray water should go into the black water tank. But that's just not possible. That issue I can work around.Bob Dunahugh78 Royale.
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| Re: [GMCnet] Sewer vents. How complicated can that be. RIGHT. [message #295233 is a reply to message #295232] |
Mon, 08 February 2016 10:51 |
Nelson
Messages: 120
Registered: August 2014
Karma: 0
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Just to add to what others have already posted, if you don't use the shower often, the trap will dry out and not work as designed. Just add a cup of water to the drain and most of the siphoned fumes will be sealed off.
HTH,
Nelson Wright
78 Royale Rear bath
Belle Isle Fl.
On Feb 8, 2016, at 10:51 AM, D C _Mac_ Macdonald wrote:
> Hi, Bob.
>
> Well, I am NOT a plumber, but if I were basically starting from scratch where you are,
> I would install a SEPARATE vent for the black water tank! I am also a firm believer in
> the wind-sensing (think weather vane) venturi vent for the outlet of that vent pipe.
> They are available at almost any RV supply outlet.
>
> This device provides a lower pressure at the "downwind" outlet and will suck out
> sewage fumes from the black tank. Even if there is ZERO wind, the lighter-than-air
> sewage gases will exit UP the pipe. Remember that if you break wind, it's aimed at
> the floor, but it still hits you in the nose!
>
> You also have to remember to not have any bathroom exhaust fan running when you
> flush your "stuff" down into the holding tank! HAR!!!
>
> The contents of the "gray" tank can also develop a stench, even if it isn't as bad as
> what's in the "black" tank. That's why I'd also add the "weather vane" to a grey tank.
>
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ~~ ~ D C "Mac" Macdonald ~ ~~
> ~ ~ Amateur Radio - K2GKK ~ ~
> ~ ~ Since 30 November '53 ~ ~
> ~ ~ USAF and FAA, Retired ~ ~
> ~ Member GMCMI and Classics ~
> ~ ~ ~ Oklahoma City, OK ~ ~ ~
> ~~ ~ ~ "The Money Pit" ~ ~ ~~
> ~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
> ~ ~ ~ '76 ex-Palm Beach ~ ~ ~
> ~~ k2gkk + hotmail dot com ~~
> ~ www.gmcmhphotos.com/okclb ~
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
> ______________
> |[ ]~~~[][ ][]\
> "--OO--[]---O-"
>
>
>
>> From: yenko108@hotmail.com
>> To: gmclist@list.gmcnet.org
>> Date: Mon, 8 Feb 2016 00:45:30 -0600
>> Subject: [GMCnet] Sewer vents. How complicated can that be. RIGHT.
>>
>> I'm not into sewer venting in an RV. And I'm somewhat knowledgeable about residential venting. Basically I know enough to be dangerous. The mouse house gray water tank has two drain lines going into the top of the tank. Both drain lines have have 1.5 inch vents teed into those lines. The black water tank had an 1.5 inch vent line that tied into the gray water tank vent. I understand why a large vent is needed for a standard residential toilet. But an RV toilet flushes in a much different manner. And with much less water volume. So I need to figure out just how small a vent line I can get away with for the black water tank. And I mean seriously small vent. The rear drive in shower is 42 by 57 inches. The shower, bath, and kitchen sink will all go into the gray water tank. And I know that some gray water should go into the black water tank. But that's just not possible. That issue I can work around.Bob Dunahugh78 Royale.
>
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| Re: [GMCnet] Sewer vents. How complicated can that be. RIGHT. [message #295234 is a reply to message #295233] |
Mon, 08 February 2016 11:07 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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Nelson's comments below also apply to seldom-used bath tubs,
whirlpool tubs, or showers in your "dirt house!"
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ Since 30 November '53 ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ Member GMCMI and Classics ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~~ k2gkk + hotmail dot com ~~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
|[ ]~~~[][ ][]\
"--OO--[]---O-"
> From: f25ccapt@gmail.com
> Date: Mon, 8 Feb 2016 11:51:40 -0500
> To: gmclist@list.gmcnet.org
> Subject: Re: [GMCnet] Sewer vents. How complicated can that be. RIGHT.
>
> Just to add to what others have already posted, if you don't use the shower often, the trap will dry out and not work as designed. Just add a cup of water to the drain and most of the siphoned fumes will be sealed off.
>
> HTH,
>
> Nelson Wright
> 78 Royale Rear bath
> Belle Isle Fl.
>
> On Feb 8, 2016, at 10:51 AM, D C _Mac_ Macdonald wrote:
>
>> Hi, Bob.
>>
>> Well, I am NOT a plumber, but if I were basically starting from scratch where you are,
>> I would install a SEPARATE vent for the black water tank! I am also a firm believer in
>> the wind-sensing (think weather vane) venturi vent for the outlet of that vent pipe.
>> They are available at almost any RV supply outlet.
>>
>> This device provides a lower pressure at the "downwind" outlet and will suck out
>> sewage fumes from the black tank. Even if there is ZERO wind, the lighter-than-air
>> sewage gases will exit UP the pipe. Remember that if you break wind, it's aimed at
>> the floor, but it still hits you in the nose!
>>
>> You also have to remember to not have any bathroom exhaust fan running when you
>> flush your "stuff" down into the holding tank! HAR!!!
>>
>> The contents of the "gray" tank can also develop a stench, even if it isn't as bad as
>> what's in the "black" tank. That's why I'd also add the "weather vane" to a grey tank.
>>
>> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
>> ~~ ~ D C "Mac" Macdonald ~ ~~
>> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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| Re: [GMCnet] Sewer vents. How complicated can that be. RIGHT. [message #295257 is a reply to message #295254] |
Mon, 08 February 2016 22:44 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Rob,
We have been supplying these Solar units for the last couple years with
great feedback.
On Mon, Feb 8, 2016 at 7:58 PM, Hal Kading wrote:
> Seems to me the vents serve two functions:
>
> 1. vent odor's from the tank(s).
>
> 2. act as a siphon break so the moving water doesn't pull the residual
> water out of the traps.
>
> I'm with Bob, other than a code that will never be checked, what is wrong
> with reducing the size and tying the two tank vents together?
>
> Hal Kading 78 Buskirk Las Cruces NM
>
>
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Sewer vents. How complicated can that be. RIGHT. [message #295258 is a reply to message #295254] |
Mon, 08 February 2016 22:50 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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Senior Member |
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The biggest problem with the small vent will be when draining the waste tanks. If the through the roof vent is too small it will tend to suck the traps dry as it looks for more air to fill the void from the escaping waste water. If you use a maserator you might get buy with a correspondingly smaller vent.
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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