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Old 10-24-2012, 02:03 PM   #11
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Quote:
Originally Posted by Fire Instructor
There is a very basic hydraulics problem in the way that these systems and other water systems are designed to work. Water filling the tank displaces air. Water being drained from the tank is displaced by air. Whichever is more restrictive in flow becomes the limiting factor. Ever try to pour from you 5-gallon water jug, but have the water flow limited because the 1/8" vent wasn't letting enought air in? The same thing can happen (both ways) in your RV water tank.

If your water pump can pull more water than the vent will allow air to replace (which may be the case in some of the restricted vents that we aare talking about), than water flow will be restricted. I've seen folks go to a larger capacity pump so that they can get a mbetter shower, with no sucess. Likely becoase it couldn't pull or push more water through the 1/2" pipes, nor could air enter the tank quickly enough. If water in-flow can greathly exceed air release, then system components that were not designed to be pressurized may actually have pressure and fail.

It's interesting to compare water tanks in RV;'s vs water tanks in fire apparatus. Fire apparatus manufacturers are required to install a significantly LARGER vent, than the fill pipe for a water tank. This is to ENDURE that he tank never gets "pressurized" or pulled into vacuum, causing damage to tank or fittings. Yet in RV's, we typically see tank vents no larger than 1/2" OD, with a 3/8" worikn opening at the fittings....
My point exactly!
Also water going down small fill tube will draw in air as well.

Turbs
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Old 10-24-2012, 11:28 PM   #12
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Quote:
Originally Posted by f1100turbo View Post
As Dave said it has to have a vent line.

My tank takes 20 to 30 minutes to fill as I just trickle it in.
If I don't and open hose to full blast it belches and farts back to no end.
The water flow in on full blast is more than air can escape back out.

This what you need!

Secure-Fill - Snl Products SNL1SF - Faucets & Inlets - Camping World

Or this .
https://images-na.ssl-images-amazon....500_AA300_.jpg
Ron,
That is exactly what I was talking about! The fill tube from the outside of the camper running into the tank is about an 1" in diameter, this device is a smaller diameter, the water will go directly into the tank. The air should escape between the two tubes. The Camping World one looks like the way to go. The Amazon one is what I had in mind to assembly.
Thanks,
Mark
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Old 10-24-2012, 11:45 PM   #13
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Quote:
Originally Posted by Mark2x2

Ron,
That is exactly what I was talking about! The fill tube from the outside of the camper running into the tank is about an 1" in diameter, this device is a smaller diameter, the water will go directly into the tank. The air should escape between the two tubes. The Camping World one looks like the way to go. The Amazon one is what I had in mind to assembly.
Thanks,
Mark
That should make your life easier!

Let me know if that works for ya!


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