On 12/27/2011 9:00 AM, [email protected] wrote: > Send Liveaboard mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > http://liveaboardonline.com/mailman/listinfo/liveaboard > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Liveaboard digest..." > > > Today's Topics: > > 1. Re: exploding stuffRe: pvc pipe (Ben Okopnik) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Tue, 27 Dec 2011 09:35:29 -0500 > From: Ben Okopnik<[email protected]> > Subject: Re: [Liveaboard] exploding stuffRe: pvc pipe > To: [email protected] > Message-ID:<[email protected]> > Content-Type: text/plain; charset=us-ascii > > Hi, Steve - > > On Mon, Dec 26, 2011 at 10:00:00AM -0500, SteveW wrote: >> I looked at that website, Ben, and it appears that PEX is designed for water >> systems (presumably, potable water) and it doesn't mention anything about >> it's use for sanitation hose. Which brings up two questions in my mind. > Searching for "PEX 'sanitation hose'" pops up a number of links. :) One > of the first ones describes PEX(A), PEX(B), and PEX(C) as being > appropriate for sanitation use, with pros and cons (mostly, degree of > flexibility) listed for all three. > > Please do note, by the way, that I'm not an expert on this stuff by any > means, and am not arguing for it as one. It's just that everything I've > read so far, plus my own small bit of experimentation with it, plus the > fact that the entire building industry is shifting to the stuff as > quickly as they can, add up to a very positive picture for me, so it's > what I'm going to use from here forward. > >> The website specifically cautions against using it with any supply "...where >> the system contains...ferrous corrodible components..." . > That's specific to potable water systems. "HEPEX" (i.e., PEX used for > hydronic systems), for example, doesn't have that kind of restrictions. > I seriously dobut that PEX used for sanitation would either. > >> Now I'm not sure >> whether there are any "ferrous corrodible components" in human waste > [grin] Not unless you've been chewing 10-penny nails... > >> but it >> doesn't sound to me as if its manufactured with any odor containing elements >> as marine sanitation hose is. > The problem with the usual marine hose is that it's rather porous. PEX > isn't, any more than steel pipe is, so there shouldn't be any concern > with odors. Again, no guarantees, but - well, most holding tanks these > days are made of polyethylene... > > > Ben Hello All, I am a long time "lurker" on this list. I am a proponant of the PVC sanitation hose application too. Having been in the swimming pool & spa business since 1960, I feel that I have considerable experience working with PVC plumbing. There are hundreds of hot tub manufacturers and virtually every one of them use flexible PVC in their plumbing systems. Hot tubs deal with 104 + water temperatures and up to 60 P.S.I. . All in ground pools built for the last several decades have been plumbed with ridged PVC piping under ground as well as above ground. It is code that any PVC piping above ground be painted to protect against UV damage. I have plumbed both of the holding tank systems in our Columbia 45 with 1 1/2" flexible PVC. They have been in service for many years without any leaks or problems whatsoever. Flexible PVC hose is available at many pool supply stores as well as hardware stores. It IS slightly different in diameter than what West Marine sells as sanitation hose, so it must be used with standard glued PVC fittings. A hose barb is a little too small for it's ID. The most important part of a holding tank installation isn't the kind of plumbing it has, but how well it is vented. My holding tanks have TWO 3/4" vents each ( one at each end ) and we do not have ANY problems with oders aboard our boat Thank you for letting me contribute my 2 cents worth. We have been restoring "Compadre" for 9 years & hopefully will be able to cast off on our retirement cruise soon now.
Doug Ward Columbia 45 Compadre Long Beach, Ca. _______________________________________________ Liveaboard mailing list [email protected] To adjust your membership settings over the web http://liveaboardonline.com/mailman/listinfo/liveaboard To subscribe send an email to [email protected] To unsubscribe send an email to [email protected] The archives are at http://www.liveaboardonline.com/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/[email protected] The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
