Skip to main content ↑ ↓
Topic: Fresh Water Overflow Vent Project (Read 1200 times) previous topic - next topic

Fresh Water Overflow Vent Project

Since I have had everything out of the freshwater compartment, putting it back together from a blank slate creates some opportunities to make changes that wouldn't otherwise be feasible. I have routed the Vent/Overflow up through the floor and looped it back down through the original bulkhead penetration. I ran a 1" PVC pipe down the backside of the bulkhead to be able to direct the overflow away the bulkhead joint. Time will tell if this will be a successful strategy or not, but I am betting that it will function as I designed it to. I put in a tee in the loop with a riser and an inline vent inside of the laundry hook up cavity. I could of course short circuit the loop and run the overflow right through the bulkhead and still have the benefit of the pipe to direct the water away from the bulkhead joint, but I would first have to take the water heater out to accomplish this. So those are the stakes of my bet... ::)
Don
Edit: I should mention that since our washer hook ups were leaking and I needed to replace the valves. I used the inch and a half hole that the washer hook up Pex lines ran through for my 1-1/4" PVC overflow/vent loop (happened to be in the right place) and that I drilled to new holes to reroute the washer hook ups to their respective sides of the manibloc for more direct routes. I also mounted the valves 180 degrees from where they were originally to give more space to open and close the valves.
The selected media item is not currently available.
Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: Fresh Water Overflow Vent Project

Reply #1 –
Don,
 If I had mine that far apart, I would look into running those vent lines to the roof. I hate those springy poppet type vents.
Bye
Rick

Re: Fresh Water Overflow Vent Project

Reply #2 –
Thanks for the thought Rick! I have actually considered that and may still do that eventually since I could do it mostly from inside the closet without taking anything else apart. My hesitation at the moment is that I have about 408W of Unisolar flexible panels going up (with the possibility of another 408W in the future), and due to the size, they are going to be very tight placements. So before I will penetrate the roof, I will have done the solar panel installation first.
Don
Quote from: Rick –
If I had mine that far apart, I would look into running those vent lines to the roof. I hate those springy poppet type vents.
The selected media item is not currently available.
Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: Fresh Water Overflow Vent Project

Reply #3 –
Before you run another vent line or install an automatic vent,you might consider this.  The only reason for vents for fixtures is to prevent siphoning the P trap dry which will allow sewer gas inside.  They also are necessary for flush toilets in houses but that's another issue.  The only way I see to fill the drain lines to a point that would allow sufficient negative pressure to siphon a trap would be if you had a bath tub, and, maybe, if you filled a sink completely full and then dumped it. Of course you could seal it again by running a few ounces of water to refill trap.

 Since I do neither in the RV, the auto vents will be replaced with solid caps.  Of course the black and grey tanks need to be vented but that's taken care of.  I'm sick of these sewer gas emitters and am convinced they are unnecessary.  We'll see....
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: Fresh Water Overflow Vent Project

Reply #4 –
The air admittance valves are used to prevent sucking the seal water out of any p trap on the leg of the system that doesn't have a stack. The full kitchen sink my suck the water out of the washing machine or the washing machine my suck it out of the shower drain. Without them you may be chasing bad smells from drain to drain. I think I would rather have the air admittance valve in a good location then another roof penetration.They also allow the water to flow faster in the drain lines and help to prevent a gurgling sound in the system.Gam
joseph gambaro
1999 U295 36'

Re: Fresh Water Overflow Vent Project

Reply #5 –
Driving the coach at highway speeds (and often with a headwind or cross-wind) may also cause enough vacuum in the roof vent to empty the p-trap without the auto vents - another reason why they may be there.
Dave and Nancy
1999/2013 U270 36' Xtreme
Motorcade # 16774
2013 Subaru Outback
KD0NIM

Re: Fresh Water Overflow Vent Project

Reply #6 –
I never though of what purpose they may have on the road but I think your correct. That may be why they go bad as often as they do in a coach and not when installed in a home.Gam
joseph gambaro
1999 U295 36'

Re: Fresh Water Overflow Vent Project

Reply #7 –
Easy enough to find out what the effect of removing them is, I'm going to give it a try.  The vacuum effect from driving may well be the deal breaker though driving is usually when the smell occurs with the vents installed.  I know when winds climb much over 75 mph at our place the traps in the house sometimes are sucked dry...you notice it instantly. 
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: Fresh Water Overflow Vent Project

Reply #8 –
You can try disabling them with out replacing by just wrapping them with duct tape.
Dave and Nancy
1999/2013 U270 36' Xtreme
Motorcade # 16774
2013 Subaru Outback
KD0NIM

Re: Fresh Water Overflow Vent Project

Reply #9 –
Quote from: Dave Katsuki –
You can try disabling them with out replacing by just wrapping them with duct tape.

Excellent idea, will do.  Probably won't remove the washer to get to the one inside the enclosure, too lazy. 
"Not so  long ago we were a nation of risk takers, riding five million pounds of  thrust straight into space."  Joe Gresh
Chuck Pearson
1996 U295
2018 Can Am X3 TurboRS

Re: Fresh Water Overflow Vent Project

Reply #10 –
Don, Keep me posted as to when you're going to be through with your coach. Since you seem to enjoy working on them I'll just drop our off and take yours until such time as you get the to-do list done on ours.
Larry
1996 U295 36'
Build # 4805
Actually we sold it but just like to lurk

Re: Fresh Water Overflow Vent Project

Reply #11 –
I know these vents are usually used to vent waste pipes... Our coach has 4 of these. Two in the closet where the washer hooks up (I added the second when I put the washer in... or maybe I just moved it, don't remember now...), and one each in the kitchen sink cabinet and bathroom vanity. I learned the smelly lesson when one of these vents went bad... the vent I added for the overflow loop is solely to allow water into the fresh water tank when the overflow pipe is full of water. I am not totally sure it is necessary, but I thought I might want to cap the overflow pipe when traveling with a full tank and then there would need to be a source to let air into the tank. At any rate, the new vent shouldn't result in in any smelly episodes if it were to go bad. As a result of testing my system, we won't be traveling with an over full FW tank. I will either stop the fill before the vent hose is completely  full or drain enough to uncover the opening before hitting the road. The reason for that is when filled to the point where the overflow/vent hose is full of water, I could see bulging on the top of the tank from trapped air (because of the fact that the overflow/vent fitting on the fresh tank isn't at the highest point). I don't think the pressure could be that much, but I don't want to put any extra strain on the tank.
Don
The selected media item is not currently available.
Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: Fresh Water Overflow Vent Project

Reply #12 –
Larry , It is all a means to an end, but I might be able to start on your list by 2063 or so... ;D
Quote from: lgshoup –
Don, Keep me posted as to when you're going to be through with your coach. Since you seem to enjoy working on them I'll just drop our off and take yours until such time as you get the to-do list done on ours.
The selected media item is not currently available.
Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson
 

Re: Fresh Water Overflow Vent Project

Reply #13 –
Don, The beauty of a Foretravel is that it will probably last until 2063!
Larry
1996 U295 36'
Build # 4805
Actually we sold it but just like to lurk