Pex questions

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Pex questions

Postby flboy » Mon Jul 25, 2016 11:45 am

I have some plumbing questions and hoping someone can advise. I am going to use Pex tubing to plumb My CTC conversion and my thought is to have a ½” Coldwater and Hotwater Main then will have reduction T’s to tap off where needed to 3/8 in into faucets, etc.. I have seen manifolds used where all the tubes are “homerun”, but I’d rather not do that unless very necessary. Questions:



1) Is ½ too big. If so what size. I am not at home and don’t know what the standard RV pump would need.

2) Are reductions needed at the (“T”) tap points to maintain pressure? I believe the faucets and etc. reduce internally.

3) Depending on answers for #1 and #2, Could 3/8” be used throughout?



Thank you in advance. I can use the advice. I have no problems connecting things up, but not being a plumber, I am not sure on these things and want a professional installation with good pressure.

I have posted this question in my CTC build thread also but posting here also in case other non CTC builders never look there or read there. Thanks!

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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: Pex questions

Postby greygoos » Mon Jul 25, 2016 12:54 pm

Standard size for water pumps in mobile food carts and trailers are 1/2 inch inlets and outlets. I believe it is the same for the RV industry.
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Re: Pex questions

Postby lrrowe » Mon Jul 25, 2016 1:02 pm

I have used 1/2 in pex all the way around. I had the opposite problem this weekend. At my fitting from the street hose to my system, I used 1 in tubing with hose clamps for the transition. But the CG pressure was way too much and it blew the connector/hose apart. Luckily, I was right next too it when it blew and was able to rush to the CG facuet to shut off the hose.

I will now hard plumb it by replacing the 1 in aberration with 1/2 Pex and crimp clamps. And I will always use a street pressure valve along with a shut off right at the trailer.

Now as far as 1/2" goes with a 12v pump, all I can add is that the pressure is quite high, so I do not believe that the tees will not be an issue.[quote][/quote]
Bob

First Post on Purchase of Trailer: http://www.tnttt.com/viewtopic.php?f=42&t=60722
Hot water infloor and radiator heating project:[url]http://www.tnttt.com/posting.php?mode=reply&f=54&t=62327[/

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Re: Pex questions

Postby flboy » Mon Jul 25, 2016 2:04 pm

lrrowe wrote:I have used 1/2 in pex all the way around. I had the opposite problem this weekend. At my fitting from the street hose to my system, I used 1 in tubing with hose clamps for the transition. But the CG pressure was way too much and it blew the connector/hose apart. Luckily, I was right next too it when it blew and was able to rush to the CG facuet to shut off the hose.

I will now hard plumb it by replacing the 1 in aberration with 1/2 Pex and crimp clamps. And I will always use a street pressure valve along with a shut off right at the trailer.

Now as far as 1/2" goes with a 12v pump, all I can add is that the pressure is quite high, so I do not believe that the tees will not be an issue.

So I will be good just using 1/2 tubing as a main and then "T" off as needed for faucets, toilet, etc. ? That will it very convenient. Thanks.

Sent from my SM-N900P using Tapatalk
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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flboy
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Re: Pex questions

Postby lrrowe » Mon Jul 25, 2016 3:40 pm

flboy wrote:
lrrowe wrote:I have used 1/2 in pex all the way around. I had the opposite problem this weekend. At my fitting from the street hose to my system, I used 1 in tubing with hose clamps for the transition. But the CG pressure was way too much and it blew the connector/hose apart. Luckily, I was right next too it when it blew and was able to rush to the CG facuet to shut off the hose.

I will now hard plumb it by replacing the 1 in aberration with 1/2 Pex and crimp clamps. And I will always use a street pressure valve along with a shut off right at the trailer.

Now as far as 1/2" goes with a 12v pump, all I can add is that the pressure is quite high, so I do not believe that the tees will not be an issue.

So I will be good just using 1/2 tubing as a main and then "T" off as needed for faucets, toilet, etc. ? That will it very convenient. Thanks.

Sent from my SM-N900P using Tapatalk


This just an example or two of my tees.
Image]
Image

Don't let the tangle of a mess confuse you. This is an old photo where I was playing with radiant tubing heat (works by the way).
Bob

First Post on Purchase of Trailer: http://www.tnttt.com/viewtopic.php?f=42&t=60722
Hot water infloor and radiator heating project:[url]http://www.tnttt.com/posting.php?mode=reply&f=54&t=62327[/

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Re: Pex questions

Postby flboy » Mon Jul 25, 2016 4:18 pm

Wow... that's a lot of connections!
Thanks all for the feedback. I am going 100% 1/2 Pex. Bought the materiel at Lowes. I ended up just buying the White Pex tubing. 100' (way more than I need) was $27 and change. They only see 100 feet rolls. I wanted to use blue and red, but I did't want to buy 200ft. I'll just used some colored electrical tape in areas where it may be confusing. I have Red and Blue, so I will mark them at the connections.
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: Pex questions

Postby flboy » Fri Aug 12, 2016 9:16 pm

I went with the 1/2" Pex as you guys suggested. I have to say, this stuff is very easy to work with. I haven't pressurized the system yet, so we'll see how well I did then. :-)

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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
User avatar
flboy
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Posts: 1894
Images: 375
Joined: Tue May 15, 2012 6:13 pm
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