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Flooded SOB
04-25-2015, 12:41
Post: #1
Flooded SOB
This thread has been making the rounds on the forums. The owner took delivery of his brand new 2015 Newmar King Aire only to have a water connection fail 3 days after delivery. The connection under his kitchen sink unleashed gushing 50 gallons of water into his RV.

There are differing points of view represented in the long thread, but most expect Newmar to eventually step up and replace the coach.

For my entire RV history I've always relied only on my water pump for domestic water delivery. When at a CG I fill up my tank and disconnect from shore relying on my water pump. When leaving the coach I always turn off the pump and I always make certain it's off before retiring. This unfortunate event happened while driving down the road. With a wife and three kids running around we almost always have the water pump on when traveling; I'm hoping that one of my little rascals will spot trouble in this case!

david brady,
'02 Wanderlodge LXi 'Smokey' (Sold),
'04 Prevost H3 Vantare 'SpongeBob'

"I don't like being wrong, but I really hate being right"
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04-25-2015, 12:57
Post: #2
RE: Flooded SOB
That is what we do too. Fill the tank, then use the onboard pump. Turn if off when not in use.

However, if we were to become longer term residents somewhere, say a couple months at a time, it would be a LOT easier just to use the water pressure from the hookup, like one does at home.
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04-25-2015, 14:56
Post: #3
RE: Flooded SOB
I leave the pump on all the time. in my 94pt it has been on for 11 years. Most times I don't even shut it off while I am filling up. My objective is to keep air out of the lines. In the refer upgrade I just did in my LXi I installed a tee in this tube close to the ice-maker and added 3 foot of ice-maker tube to a dead end valve so I can drain this line also. The line comes out the bottom of a closet close to the refer. Incoming water regulated back to 30 psi will compress air trapped in the line to greater than 30. often over 200 psi so those inline regulators only help static pressure. I often think of installing a light to come on when the water-pump runs to warn issues, but that would involve opening up the pump to get to the pressure switch.

Gregory O'Connor
2001 LXi43ss
Romoland California 92585
951-830-5997
Rainbowrv.com
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04-25-2015, 17:45
Post: #4
RE: Flooded SOB
Yes, but isn't it true that water hammer pressure spikes also occur in the absence of air in the line? You have a column of water rushing thru a pipe and a valve is slammed shut. It's an f=ma problem. It's because water is incompressible that the hammer is so hard. Put a column of air at the end and now we've lowered the deceleration and hence the peak pressures; we've given that bullet of water a place to go. I never worried too much about it in a motorhome because the piping branches are typically short, the static pressures low, and the water velocities are low.

Pex can handle static pressures up to 160psi and I'm sure transient pressures quite a bit higher than that, and it has a natural ability to expand so in effect it's acting as a shock absorber to water hammer.

david brady,
'02 Wanderlodge LXi 'Smokey' (Sold),
'04 Prevost H3 Vantare 'SpongeBob'

"I don't like being wrong, but I really hate being right"
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