jimh406
Western MT
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Why do we need 8 post from someone who's not an expert about water pumps? ![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/grin.gif "grin")
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CA Traveler
The Western States
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TCBear, I disagree with your very first post... You are now indeed a RV expert...![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/biggrin.gif "biggrin")
"I'm not an RV expert, but..."
Thaniks for posting all of your research, ![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/cool.gif "cool")
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Bob
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Bobbo
Wherever I park
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jimh406 wrote:Why do we need 8 post from someone who's not an expert about water pumps?
Why do we need posts from someone who has absolutely nothing to say on the topic of this thread?
Bobbo and Lin
2017 F-150 XLT 4x4 SuperCab w/Max Tow Package 3.5l EcoBoost V6
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StirCrazy
Kamloops, BC, Canada
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one problem I see is when you are talking about the strength of pex. The failure point is a little more difficult than you made it sound as it isn't based solay on pressure, but rather a factor of temperature and pressure. Also, it depends on the type of PEX you get, yes there are different grades, some that will hold more pressure but are very stiff and some that are softer, so they bend easily but don't hold as much pressure. then there are simply inferior brands.
for instance, 5 years after doing renos I would start having mysterious failures in my pex hot ware line. just tiny splits that let a mist come out, and each time I would cut out a section and replace it. They were starting to show up on a regular basis and I had my plumber involved then the manufacture of the pex got involved. They sent out some equipment to be installed that monitored pressure and temprature over two weeks and what we found is the city turned up the pressure to 95psi and it quite frequently spiked to 120psi and I didn't have a pressure regulator. So, this issue was only happening on the hot water side, and I have a ring main on demand hot water set up that I was running at 135 degrees. So, what I found out is the hotter the temp the lower psi the pex can handle and a combination of 135 degrees and spikes of up to 120psi was enough to make failures.
Given the lower pressures we run in rv's we would never see this issue but be careful even going to 60psi. Yes, the pex itself may handle it but the problem with the rv industry is generally they use cheap plastic crimp fitting and tap sets which will fail long before the pex itself. the line won't split from freezing it's the fittings and fixtures that break now.
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wildtoad
Blythewood, SC
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Very nice yet wordy write up, I think if my water pump fails after 16 years I’d be hard pressed to change brands. I have installed a small accumulator tank, not for the water pump but it stopped my water heater from dripping through the relief valve.
Tom Wilds
Blythewood, SC
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zigzagrv
Nazareth, PA
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TCBear, excellent post. Thanks for all the time and effort you put into enlightening us on water pumps!
Ron
2003 Gulf Stream Ultra Supreme 33'
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Grit dog
Black Diamond, WA
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Grit dogs tips for choosing a 12V replacement pump.
Open up Amazon app.
Purchase suitable name brand pump that has next day or whatever delivery.
Install.
Enjoy.
Great info posted by the OP, and maybe useful to someone who is largely or completely unfamiliar. To those same folks. Replacing a water pump (if you have good access to it, is literally as simple as 2 water line connections, 2 wires and 4 mounting screws. Please do not think it’s complicated.
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jimh406
Western MT
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Bobbo wrote:jimh406 wrote:Why do we need 8 post from someone who's not an expert about water pumps?
Why do we need posts from someone who has absolutely nothing to say on the topic of this thread?
Just to educate people on what a smiley face means. . I'm happy to help. ![[emoticon]](http://www.coastresorts.com/sharedcontent/cfb/images/wink.gif "wink")
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opnspaces
San Diego Ca
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Agreed, TCBear thanks for putting in the effort for the write up. Not only was was very informative but I'm sure we're going to see people referring to your post in the future as well.
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TCBear
USA
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Thanks for the feedback and shout-outs, folks! Much appreciated. As was likely obvious, I didn't want to write a short reference guide to pumps since those are readily found on the InterTubes. I was actually going for the very LONG version with a dump truck's worth of details, one that even explains what NSF51 means and mentions the burst point of PEX. Many won't read my novella, but there's many factoids there for those who want that detail. I suppose I wrote it for you real and faux engineers out there.
Speaking of PEX, thanks for your details on that, StirCrazy. You're correct that there's several variations of PEX, and its reliability and capabilities including burst pressure start to get fuzzy after a decade of use, vibration and summer heat.
Glad my lengthy mosh pit o' wordage proved helpful.
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