Sink Questions - Page 3 - Fiberglass RV


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Old 04-22-2003, 10:55 PM   #29
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Howdy,....Hope everybody`s sinks are draining well now.....Whatever works.......Mine drains quite nicely...well now off to another subject......Benny
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Old 04-24-2003, 09:45 AM   #30
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[quote]Orginally posted by Joe Winkelmann

Quote:
Orginally posted by Benny K

Hi again Joe, .....Another explanation would be : compare your sink to a funnel and you pour water in the top and it leaks out the bottom into your container ....no vent required.....Benny


Hi Benny: Good point. With a one sink arrangement a vent would indeed appear not to matter.Funnel analogy: This is true as long as the spout of the funnel is very short, where air can be exchanged as water exits. As spout, pipe or hose gets significantly longer, flow is reduced or stopped entirely because column of water starts to equal atmospheric pressure. I belive a column of water at sea level equals atmospheric pressure at about 10 Meters vertical run or so. With plumbing systems, pipes can often be very long, requiring venting. Cap off the plumbing vents on your house and see how toilets, and sink drain.
Sinks will drain through other sink/toilet drains (what a mess!) instead of down to sewer if they drain at all. Vents are not just for escape of sewer gases, traps do that.
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Old 04-24-2003, 09:57 AM   #31
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Long pipes

Hi Joe , If you had a pipe that went downhill and you poured water into the high end , how long would the pipe have to be for the water to stop running out the low end??? In other words if you were at the top of a mountain and the water pipe went to the valley would the water poured into the pipe stop running and just stay in the pipe?? Remember that in my previous posts, the the end of the drain hose was never submerged in water in the drain waste container. Also I am aware that traps are in the system to block the sewer gas from backing up the system.
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Old 04-24-2003, 10:04 AM   #32
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I think this is the key. - basically with exceptions I'm sure - if the end of the drain hose was never submerged in water or closed up in the drain waste container. you would not need a vent, but if it is either or both it would for positively absolutely need a vent. :)
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Old 04-24-2003, 10:46 AM   #33
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Pardon me, Again you're right. I was thinking of head loss charts for pumping water uphill. Also what i was incorrect about is that the end of hose or pipe would have to be draining into a pressure holding vessel or tank otherwise water column never equals atmospheric pressure. A metropolitan sewer sytem can assumed to hold pressure as there are not enough underground vents, making venting at individual fixtures necessary. Ever notice the screened vent in the lawn between the street lateral and the house? If it does become totally blocked by dirt. house sewage draining can be impaired. Long runs between street and house often require multile of these vents. Great job, great posts! Once again, mea culpa!
The matter pertinent to this thread is this, If you have a sealed rv holding grey water tank it needs a vent, a hose into bucket does not. If grey water tank has a vent line make sure the vent hose is carried above the level of the sink drain.
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Old 04-24-2003, 10:55 AM   #34
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Quote:
Orginally posted by Joe Winkelmann



Pardon me, Again you're right. I was thinking of head loss
The matter pertinent to this thread is this, If you have a sealed rv holding grey water tank it needs a vent, a hose into bucket does not. If grey water tank has a vent line make sure the vent hose is carried above the level of the sink drain.
Actually I got involved in this thread when someone mentioned that they drain their sink into a pail or whatever and that person was told that a vent was required and my intention was to say that if the end of the drain was not under water and was the only fixture then a vent was not needed as was not a trap either except possibly to stop insects from entering thru the drain... It was not meant to create a controversy as it did. Anyways thanks and all okay now with all I guess......Happy trailering...Benny
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Old 04-24-2003, 12:25 PM   #35
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[/quote] Actually I got involved in this thread when someone mentioned that they drain their sink into a pail or whatever and that person was told that a vent was required and my intention was to say that if the end of the drain was not under water and was the only fixture then a vent was not needed as was not a trap either except possibly to stop insects from entering thru the drain... It was not meant to create a controversy as it did. Anyways thanks and all okay now with all I guess......Happy trailering...Benny

[/quote]

No controversy! Just a friendly exchange of ideas!
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Old 04-24-2003, 01:02 PM   #36
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:steer lets go camping. :thumb
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Old 04-24-2003, 08:48 PM   #37
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Orginally posted by Thomas and Janifer

:steer lets go camping. :thumb
Hi Jan ....Right on .....and to Joe also right on the friendly exchange of ideas....Happy and safe trailering...Benny
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Old 04-24-2003, 08:59 PM   #38
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sink questions

OK, I have purchased a flexable water bag, it holds 13 gallons and is meant to use in a boat. I want to put this bag under the seat next to the sink and have water available to me when "dry" camping. My 13 foot Scamp has a grey water holding tank. The sink now has one faucet, but not a pump type. Would it be best to purchase and install a 12 volt pump and use the faucet as is, or should I purchase a hand pump and replace the faucet installed? So much work, so little time !! Julie
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Old 04-24-2003, 09:51 PM   #39
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if the bag is permanent the you could use the 12v, probably, but if you are only using water at the sink, that almost seems like over kill to me. I have had the 12v pumps and have opted for the hand pump this time. mainly because I hate that pump with it come on, and it always comes on. but then if you have a water leak or a drippy faucet, it comes on and of and on again. so you know if alls tight because it stays off when your not using water. (I think I confused myself) crazy-ii
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Old 05-24-2003, 10:00 AM   #40
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Orginally posted by Nancy D

* * * * * * Hi Ray

When we needed to replace ours, there was none to be had. *Are they an older item or still used? *When we asked at our local dealer they seemed to have no clue about it but then that can be a typical reply as soon as its mentioned that it's from a 75. *Too old to bother with seems to be the way some of them think! *

Nancy
The part is made by CAMCO, it is called the rv drum trap.
Can be purchased online at:

http://www.campersdirect.com/albany/pages/...&pc=700&sc=4772

<img src=http://www.fiberglassrv.com/board/uploads/3ecf8b61bb66fdrumtrap.jpg/>

It is also referred to as Camper Drain Trap Polar White 37262

- Ray
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Old 05-26-2003, 03:09 AM   #41
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The reason John Ballard's sink drains slow when the hose is low in the tank is because the water draining has to displace water but when it is above, it just drains. Look at it this way, for every cup of water going down the sink, when it gets in the jerry can, it has to move a cup of water out of the way, in this case, lifting it up aginst gravity, thus slower. Adding a vent in this situation would do nothing, other than allow water to run up the vent until it reaches the same level as the water in the sink. With a smaller amount of water in the sink it would seem as if it drains faster but with a full sink it would show it is only a small storage of water and thus no help (well still a little help but only the volume of the vent-not much).

Rich
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Old 05-26-2003, 10:09 AM   #42
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Orginally posted by Rich

* * * * * * The reason John Ballard's sink drains slow when the hose is low in the tank is because the water draining has to displace water but when it is above, it just drains. *Look at it this way, for every cup of water going down the sink, when it gets in the jerry can, it has to move a cup of water out of the way, in this case, lifting it up aginst gravity, thus slower. *Adding a vent in this situation would do nothing, other than allow water to run up the vent until it reaches the same level as the water in the sink. *With a smaller amount of water in the sink it would seem as if it drains faster but with a full sink it would show it is only a small storage of water and thus no help (well still a little help but only the volume of the vent-not much).

Rich
and here I thought it was more getting the air out of the way. but then I don't think the hose totally locked off the top of the can so that wouldn't be an issue. :wak. (gravity, wouldn't you know it)

AND Ray, THANK YOU for finding that drain trap for me. :).
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