Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 19-04-2016, 09:55   #1
Registered User

Join Date: Mar 2010
Location: Alaska
Boat: Truant Triad 37 Cutter
Posts: 338
Any Reason Not To Use PEX On A Boat?

I'm going to rig up a deck washdown pump due to a new member in the family (dog). Was going to do the typical reinforced hose routine but thought of all the pex parts and pipe I have laying around from doing bathroom remodels; seems like it would be a winner on a boat, especially if Alaska ever freezes again, which hasn't happened much since I came here three years ago.

Any experiences or thoughts about this? Also, I already have a 4 GPM pump and would like to locate it near the thru hull, which may be about 5-6 feet lower than the outlet; any worries about pumping ability?

Thanks-
Scott
__________________

__________________
seahag is offline   Reply With Quote
Old 19-04-2016, 09:57   #2
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 16,522
Re: any reason not to use PEX on a boat?

If your familiar with Pex and have the tools, it's great stuff.
I think for most that don't have the crimping tools, maybe not.
__________________

__________________
a64pilot is online now   Reply With Quote
Old 19-04-2016, 10:16   #3
Registered User
 
Stu Jackson's Avatar

Join Date: Jan 2011
Location: Cowichan Bay, BC (Maple Bay Marina)
Posts: 6,283
Re: any reason not to use PEX on a boat?

I recently replumbed the whole boat. I shudder to think about how difficult it would have been to route the hoses if they weren't flexible. I don't know how flexible Pex is, but there were many places that having to install two elbows would have been a real big PITA. Plan ahead.
__________________
Stu Jackson
Catalina 34 #224 (1986) C34IA Secretary
Cowichan Bay, BC, (Maple Bay Marina) SR/FK, M25, Rocna 10 (22#) (NZ model)
Stu Jackson is online now   Reply With Quote
Old 19-04-2016, 10:46   #4
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 16,522
Re: any reason not to use PEX on a boat?

Pex is awfully flexible, I'd be surprised if that is not what is used in new boats.
Pex as long as it is kept out of UV will last longer than we will, but I have been told that UV will kill it quick.
I used to think copper was forever is a house, then I learned it's not and had my house re plumbed with Pex.
__________________
a64pilot is online now   Reply With Quote
Old 19-04-2016, 10:50   #5
Registered User
 
ranger42c's Avatar

Join Date: Aug 2012
Location: Maryland, USA
Boat: 42' Sportfish
Posts: 2,916
Re: any reason not to use PEX on a boat?

Our whole boat is plumbed with PEX, that way from the factory...


-Chris
__________________
Selby Bay, South River, Chesapeake Bay, USA.
ranger42c is offline   Reply With Quote
Old 19-04-2016, 11:02   #6
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,769
Re: any reason not to use PEX on a boat?

Myself with going on 40 years designing and specifying plumbing systems think PEX is the perfect pipe material for the typical yacht. I like the push on fittings better then the crimp fittings as a crimp fitting reduces the inside pipe diameter and acts as a restriction orifice. It would not really be a problem on a boat, but the engineer in me, likes keeping the pipe inside diameter constant. Using slip on fittings allows for full bore fittings and easy changing, say if you want to add a deck shower.

Even better if you had an older boat plumbed with say pvc as mine was, you can slip the 1/2" pex inside the 1/2" PVC. This as tubing size is external diameter and pipe size is internal diameter. Made it easy to replum my boat way back when.
__________________
sailorchic34 is offline   Reply With Quote
Old 19-04-2016, 11:35   #7
Moderator
 
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Albany Ga.
Boat: Island Packet 38
Posts: 16,522
Re: any reason not to use PEX on a boat?

I didn't think about the "sharkbite' fittings. I've only used Pex in the house and there I used the crimpers.
Your worried about restricting by crimping, but you slid one pipe inside of another ?
__________________
a64pilot is online now   Reply With Quote
Old 19-04-2016, 14:16   #8
Registered User
 
rwidman's Avatar

Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 4,536
Re: any reason not to use PEX on a boat?

PEX will be fine for your project if you don't need the flexibility of hose. Qest compression fittings are good for PEX and are less expensive and lighter than Sharkbite fittings.
__________________
Ron
HIGH COTTON
Sent from my laptop using Windows 7
rwidman is online now   Reply With Quote
Old 19-04-2016, 14:42   #9
Registered User

Join Date: Feb 2013
Location: NH
Boat: sabre 28
Posts: 124
Re: any reason not to use PEX on a boat?

Quote:
Originally Posted by sailorchic34 View Post
Myself with going on 40 years designing and specifying plumbing systems think PEX is the perfect pipe material for the typical yacht.
From some of your previous posts regarding mechanical stuff, I knew I liked you for a reason.

Pex is an awesome product for a boat but personally I like the expander rings like in the Wirsbo/Upnor line in lieu of the crimped rings used by other manufacturers. I have never seen an expander ring leak, can't say that for the crimped rings. Even Watts is moving to an expander ring now. You can also purchase 3/8" pex which when thinking about boats should help conserve water when compared to 1/2". Of course this does depend on many faucets you want to operate at any given time. On a boat, it's your fresh water...
Many plumbing supply houses that sell this product aslo will rent the tools. In my opinion it's best to not mix & match products. Stick with one manufacturer for everything. Or you could end up like this
__________________
I'm not happy unless I'm complaining about something. I'm having a very good day!
misfits is offline   Reply With Quote
Old 19-04-2016, 14:45   #10
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,769
Re: any reason not to use PEX on a boat?

Quote:
Originally Posted by a64pilot View Post
I didn't think about the "sharkbite' fittings. I've only used Pex in the house and there I used the crimpers.
Your worried about restricting by crimping, but you slid one pipe inside of another ?
Actually the pipe slips into the sharkbite or other slip on fittings. There is no loss of inside diameter so no extra pressure pressure or increased velocity. Generally not a problem with a boat anyway. That flow restriction is why many pex home systems use a manifold system with branch lines to each fixture. It's not a big deal with one or two fixtures, but it adds up for a larger system.

Note that the sharkbite fittings are rated to 80 psig which is standard in the plumbing code in the US.

I'm still a little gun shy with crimp fittings. But that's due to the old 1970's-1980's PB systems which had aluminum crimps and copper insert fittings. Differential thermal expansion between the aluminum crimp ring and the brass fittings, caused a ton o leaks way back then. Lots of unhappy home owners.

Though the current PEX crimp systems do not seem to have that issue.
__________________
sailorchic34 is offline   Reply With Quote
Old 19-04-2016, 14:49   #11
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,769
Re: any reason not to use PEX on a boat?

Quote:
Originally Posted by misfits View Post
From some of your previous posts regarding mechanical stuff, I knew I liked you for a reason.

Pex is an awesome product for a boat but personally I like the expander rings like in the Wirsbo/Upnor line in lieu of the crimped rings used by other manufacturers.
Upnor is good stuff and that is a good system. A tad pricey for the tool for the typical home or boat owner. For the pro, it's works. And that is what is important.
__________________
sailorchic34 is offline   Reply With Quote
Old 19-04-2016, 17:56   #12
Registered User
 
zboss's Avatar

Join Date: Sep 2011
Location: On a boat
Boat: Cabo Rico 38
Posts: 3,390
Re: any reason not to use PEX on a boat?

Just completed redoing ours using pex. We used a mix of push-on sharkbite fitting and watts push-on. I think between the two, I prefer the sharkbite. Pex is plenty flexible but it will kink if pulled to tight - we used maybe six 90 degree bend supports for going around tight corners. The 10 foot sections of straight pex was a bit easier to use than the rolls. It's only about 35 cents a foot or so.

The UV light is supposed to break down PEX but if you look at the huge rolls of pex rolled up on the sidewalk in new communities for months at a time, I'm not sure its as much of an issue as we are being led to believe. Anyhow... its super easy to cut out a busted line and fix it.

FYI, I found the best tools were in fact the cheap sharkbite tools sold at Home Depot. I tried using a fancy tubing cutter but that didn't produce as good a cut as the simple razor blade device. Also, the tubing reamer is nice to have because it cleaned up the edges and allows you to mark the depth on the tube that needs to be inserted into the fittings.

To help with the installation around bends or going through hard to reach areas, we used one of those 6 foot flexible fiberglass rods. We would push the rode through or around whatever then slide the pex onto the rod. When we reached the end of the rod we would remove the rod then move to the next location.
__________________
zboss is offline   Reply With Quote
Old 19-04-2016, 18:00   #13
Registered User

Join Date: Feb 2007
Location: Live in Boise, boat is in Titusville, FL
Boat: 56' CNSO Mikado Ketch S/V Solace
Posts: 225
Re: any reason not to use PEX on a boat?

Quote:
Originally Posted by sailorchic34 View Post
Upnor is good stuff and that is a good system. A tad pricey for the tool for the typical home or boat owner. For the pro, it's works. And that is what is important.
The Pex crimper is $27.00 on Amazon. This is the one I purchased and it works great. Glad I have one on the boat for any future expansion of the system.

I also installed a Manabloc manifold so that I could manage each run independently. I ran a home run to each fixture/appliance. I did not daisy chain from one to another. In case I ever have to trouble shoot the system it will make it much simpler.

IMHO, nothing beats PEX on a boat.

http://www.amazon.com/Pex-Cinch-Clam...ds=pex+crimper
__________________
Mikado is offline   Reply With Quote
Old 19-04-2016, 18:05   #14
Registered User

Join Date: Jun 2010
Location: Sailing the Caribbean
Boat: Switch 51
Posts: 1,491
Re: any reason not to use PEX on a boat?

Most production boats use PEX nowadays. Don't know which fittings, tho.
__________________
SVNeko is online now   Reply With Quote
Old 19-04-2016, 18:38   #15
Registered User

Join Date: Apr 2013
Location: So Cal
Boat: Catalina 30
Posts: 933
Re: any reason not to use PEX on a boat?

Quote:
Originally Posted by Mikado View Post
The Pex crimper is $27.00 on Amazon. This is the one I purchased and it works great. Glad I have one on the boat for any future expansion of the system.


http://www.amazon.com/Pex-Cinch-Clam...ds=pex+crimper
That tool is for the SS cinch type of pex fittings. Sailorchic mentioned the uponor fittings.

I particularly like the ProPex (wisbro/uponor) type of fittings. You need to get em mail order or from a supply house, and the tool is around $700 or so.

But they're far better than the crimp style. On a boat, I may consider the plastic fittings over the brass ones.

These are different than the crimp fittings, you can only use PEX-A type of tubing, but once you see one done you'll understand why it's a great system.

I've re-plumbed my entire house with this stuff (copper in contact with concrete was really stupid). Once you figure it out (about 10 min for anybody that can turn a wrench) this stuff is fast fast to install.

For a DIY on a marine project, I'd always recommend ProPex IF ya can borrow the tool. The other methods are ok too, the Uponor is just better. For a DIY homeowner, it may be worth buying the tool.


Video of what I'm talking about:


(Nope, I don't work for them. I do software)
__________________

__________________
jeepbluetj is online now   Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pex In Marine Use. popeye2818 Plumbing Systems and Fixtures 47 20-04-2016 10:37
Any reason not to put in an offer? Helbent Monohull Sailboats 31 16-01-2014 16:46
Any Reason Not to.... Delancey Construction, Maintenance & Refit 9 13-04-2013 21:48
Pressure Water Plumbing - PEX, etc. Christian Van H Plumbing Systems and Fixtures 95 09-12-2011 21:13
One Good Reason Not to Use a Yacht Transporter hoppy Off Topic Forum 8 09-09-2010 15:27



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 08:31.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.