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Old 06-13-2014, 07:36 PM   #1
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Broken water line - PVC

Going thru the rv for the first time ever and I'm trying out all the systems. Put water on and turned on the pump to find a major broken line under kitchen sink. Looks like a homemade expansion tank for a water hammer?? Anyone know what this is? Is this something I should piece together or buy a new one online?Click image for larger version

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Water line into sink splits into some PVC 2" contraption. It's obviously broken and spits water out inside cabinet.
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Old 06-13-2014, 07:43 PM   #2
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Yup looks like a home made water hammer prevention device. You should be able to plug that line, but if it creates a water hammer you may have to install another one.
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Old 06-14-2014, 07:14 AM   #3
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Water hammer? With only 40 PSI, and limited flow, there is no need to absorb water inertia. I've never seen one in a motorhome. More likely someone thought they could keep their pump from cycling on and off as much with a small tank. The problem is it never emptied out. Without it getting emptied, it froze and broke. Since I've never seen one used in an RV, you can easily get rid of it and never miss it.
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Old 06-14-2014, 09:05 AM   #4
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Look something like this? RV DIY Water Accumulator | ModMyRV

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Old 06-14-2014, 10:03 PM   #5
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That's exactly what it looks like. Went to hardware store and purchased a shark bite fitting to cap it off. Will see if it needs a hammer but in the meantime this will get it operable.
Funny that you found the exact diy mod.
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Old 06-14-2014, 11:40 PM   #6
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The accumulator tank is not for water hammer. If you read the post, you will discover it was to supply water, so the pump did not cycle as often. It really doesn't work very well, because it does not have a bladder.

Your hot water tank will do the same thing to some extent. I can usually get away with one flush without the pump running anyway. i think if I were trying this DIY, as opposed to buying a 2 gallon expansion tank, I would try to mount the tank in one of the upper cabinets. This way it would gravity feed, so one could just leave the pump switch off.
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Old 06-15-2014, 09:13 AM   #7
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Okay I give up Whats a water hammer?
Also my water starts as soon as my foot hits the pedal and runs until I get to the kitchen area? Is this not normal?
The pump sounds a lot louder than last year I plan on mounting it on some sort of anti-vibe device.Currently bolted to the floor. We used a type @ work that was about 3-4 inches tall with rubber on both sides and sandwiched between was cork. Worked great and would like to find them again but the old boss bought them and I don't know where he got them.
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Old 06-15-2014, 09:28 AM   #8
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Water hammering usually occurs with high pressure and abrupt shut-off of faucets--causes the feed pipes to vibrate [hammer]. Usually solved by installing a tube with trapped air above the tee to the offending faucet to cushion the abrupt shut-off. An expansion or pressure tank usually has a bladder inside to separate an adjustable air pocket from the pressurized water. Depending on size of the tank, it in effect, stores a few pints to a few gallons of pressurized water. Small tanks tend to smooth out the starting and stopping of the pump. Larger tanks allow you to flush an RV toilet or perhaps wash your hands, or draw a glass of water without the pump cycling. If you live in a northern climate, a potential problem with hammer tubes, and expansion or pressure tanks, is that they can trap water and freeze.
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Old 06-16-2014, 07:55 AM   #9
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Thanks for enlightening me.
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