ADV-House: An 8x18 renovation.

Converting Cargo Trailers into TTTs

Re: ADV-House: An 8x18 renovation.

Postby flboy » Mon Apr 09, 2018 8:44 am

I used the crimps with the Pex and have had no problems. I also used a few sharkbites due to access and the ability to get the crimp tool in place.

They both work nicely, but if you have alot of connections to make like I did, the crimps will save you alot of money given the cost of each sharkbite connection. I did have to buy the crimp tool however. The sharkbites are easier to install for sure.. but the crimps are not bad, just need to make sure they are seated in the correct position before crimping.

I cannot answer as to the long term reliability on each, but after 2 years, no issues. I tend to think simple is better and the crimps really have nothing to fail other than the Pex itself. The sharkbite has a rubber O-ring seal instead of a compression fit, I believe. I do not know if that is a weak link? Maybe some plumbers here can say more about the long term robustness and reliability? I am just speaking from my limited experience so far.



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Don (Flboy)

Current Build CTC:
viewtopic.php?f=42&t=65498
Old CTC Build (sold)
viewtopic.php?f=42&t=50647
YouTube Videos of Finished Trailer:
https://www.youtube.com/watch?v=FASF-x9ofMY - Interior
https://www.youtube.com/watch?v=wb-pvBbyyBs - Exterior
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Re: ADV-House: An 8x18 renovation.

Postby PigTrail » Mon Apr 09, 2018 12:49 pm

Interesting test here of nylon reinforced vinyl tubing vs. pex vs. copper in a freeze-off. The copper lost while the other two held out okay.

http://www.skoolie.net/forums/f50/rv-plumbing-freeze-test-9059.html

Am wondering about ease of use of pex vs. reinforced vinyl for my application. Will have 2 runs of 1/2" that are 15' or so. One from mid point along foot of garage divider to rear where shower hooks up and another from mid-driver side to forward position to passenger side for sink spout. Everything else is runs of 1' to 2' between pump, tank, fill, vent, etc.

What is the downside of the nylon-reinforced vinyl? Seems that hose clamps would be easier to work with than pex fits, compression, sharks, etc. What drove you to select the PEX?


EDIT: Found my answer after a bit more googling....


"I have seen a fair bit of frozen, water filled pex. Here are my findings.

If the system was pressurized before freezing, it compounds the expansion. At 60psi or more, it gets ugly.

Brass fittings always fail first. I think this is why one pex manufacturer is turning to fittings and rings made of the same cross linked material.

The pex will never burst. It simply expands, mostly lengthwise. If we froze 100 feet of water filled pex, it would be around 115 feet frozen.

As far as the vinyl braided tubing, it will fail in less than a year in any case where there is heat involved. Even in cold environments, the hose clamp system is subject to leaking, expensive clamps, smells the water up, and IMO will fail long before the pex. It's a much older technology, not suitable for potable water."


And here is FLboy's thread from the plumbing section. Go with 1/2" PEX! http://www.tnttt.com/viewtopic.php?f=54&t=66680


Pex it is!
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Re: ADV-House: An 8x18 renovation.

Postby Iconfabul8 » Mon Apr 09, 2018 2:43 pm

Instructions with my pump said not to connect the pump with pex, it is too stiff and puts pressure on the fittings. For long runs you can't beat pex, it is cheap. I don't think you should approach the decision based on freezing results. Just don't let it freeze. If you freeze up, tubing is only one problem of many you will face.
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Re: ADV-House: An 8x18 renovation.

Postby hankaye » Tue Apr 10, 2018 7:56 am

Pig Trail, Howdy;

Full time RV dweller here. The connections from the pump are made with the braided nylon
hose, short runs to the PEX, allows for flex when charging the system with pressure.
PEX will also burst, generally in the short runs where there are curves and joints needed.
Sometimes it's the PEX and sometimes it will be the fitting. Your 100' example was probably
a straight run so they could measure it 'accurately', once you confine it to a small space and
it need to do it's expansion thing, has nowhere to go ... ooops.
Just something to ponder

hank
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Re: ADV-House: An 8x18 renovation.

Postby PigTrail » Wed Apr 11, 2018 10:27 am

It's like I told the guy at the Home Depot check out line as I checked out with a pile of fittings, "I could stand in that plumbing aisle for another hour, but I think I need to home and see what I'm missing and come back!" :lol:

I think I'm straight. I plan to use PEX for the longer runs of 5' or more and mostly nylon reinforced hose between the tank, pump, fill, and vent. I still need to figure out the fittings to get from 1 1/2" tank female to 1 1/4" fill hose. I haven't seen a barb that large. They have a few fittings on Amazon, but the descriptions are a bit rough and I don't wan to order four $6 fittings and only use one. Will need a few more trips to sort this!

In the meantime I finished out the propane box with this bulk-head fitting.

Image


Here it is all snugged in place. Will need to add some padding or secure the regulator, so it doesn't bang around in transit. Bulkhead fitting is 3/8 version of part G31 here: https://gashosesandregulators.com/Brass-Fittings/40. Use yellow thread seal tape on non-flared threaded propane fittings: https://www.amazon.com/Harvey-017065-Line-PTFE-Thread/dp/B000FKBXCE

Image


Thanks all for the plumbing help!
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Re: ADV-House: An 8x18 renovation.

Postby featherliteCT1 » Wed Apr 11, 2018 10:50 am

And thank you for documenting and explaining how to plump things. This will really help me when I get to this stage of my build.
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Re: ADV-House: An 8x18 renovation.

Postby flboy » Wed Apr 11, 2018 3:10 pm

PigTrail wrote:It's like I told the guy at the Home Depot check out line as I checked out with a pile of fittings, "I could stand in that plumbing aisle for another hour, but I think I need to home and see what I'm missing and come back!"


LOL... story of my life.. always back and forth for the stuff I forgot and the stuff I did not know I needed.

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Don (Flboy)

Current Build CTC:
viewtopic.php?f=42&t=65498
Old CTC Build (sold)
viewtopic.php?f=42&t=50647
YouTube Videos of Finished Trailer:
https://www.youtube.com/watch?v=FASF-x9ofMY - Interior
https://www.youtube.com/watch?v=wb-pvBbyyBs - Exterior
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Re: ADV-House: An 8x18 renovation.

Postby PigTrail » Mon Apr 16, 2018 9:21 am

Still making trips to Home Depot and laying out the plumbing setup.

I insulated and boxed the passenger side fender with scrap 1/2" BCX plywood and mounted these two parallel pieces of 1" square tubing to hold the hot water on demand unit.

Image


Here it is mounted and ready for that plumbing.

Image


That spot under the window needs a little shelf and I can route the water-supply pipe underneath it.

Image


Up front I'm starting to mock in the position of the water tank with the drawers I built a few weeks ago. Want to make sure there's room when everything is closed.

Image


Now for the first cut into the side of the trailer. I used the packaging as a template for the water-fill.

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These bits cut the metal easily.

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Here's the first cut after a few carefully placed drill-holes.

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I then held the unit in place and pre-drilled all the mounting holes. This way none of the metal bits get caught in the butyl tape and I have a smooth final-fit.

Next, apply the butyl tape and push into place.

Image


That turned out pretty well, but geeze that trailer is dirty!

Image


Fill and city-water connection.

Image
Last edited by PigTrail on Mon Apr 16, 2018 12:59 pm, edited 1 time in total.
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Re: ADV-House: An 8x18 renovation.

Postby flboy » Mon Apr 16, 2018 9:55 am

Wow... Very nice work. Going to be a fine Toy Hauler!

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Don (Flboy)

Current Build CTC:
viewtopic.php?f=42&t=65498
Old CTC Build (sold)
viewtopic.php?f=42&t=50647
YouTube Videos of Finished Trailer:
https://www.youtube.com/watch?v=FASF-x9ofMY - Interior
https://www.youtube.com/watch?v=wb-pvBbyyBs - Exterior
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Re: ADV-House: An 8x18 renovation.

Postby MrBo » Mon Apr 16, 2018 11:02 am

Beautiful build! Must be nice to have all that space to work with. Well done!

:thumbsup:
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6x14 Build Log - Rolling Thunder - Cabin on Wheels - http://www.tnttt.com/viewtopic.php?f=42&t=69971
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