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-   -   Cpvc vs galvanized (http://www.diychatroom.com/f7/cpvc-vs-galvanized-158091/)

digitalplumber 09-26-2012 07:08 PM

Cpvc vs galvanized
 
Looking at using cpvc to replace galvanized in remodel. My question is, will half inch cpvc deliver same volume as half inch galvanized? Sure does not look like it?

TheEplumber 09-26-2012 07:25 PM

I couldn't tell you for sure, but you usually don't want more 2 fixtures on a 1/2" line. At least that's my rule of thumb. You could step up to 3/4"

jschaben 09-26-2012 08:22 PM

Quote:

Originally Posted by digitalplumber (Post 1018039)
Looking at using cpvc to replace galvanized in remodel. My question is, will half inch cpvc deliver same volume as half inch galvanized? Sure does not look like it?

According to the CAD drawings at McMaster Carr, the ID of 1/2" galvanized is .622" and the ID of 1/2" cpvc is .526. Of couse, with the propensity galvanized has to crud up, they are likely about even. Personally, I would recommend 3/4" cpvc, ID .722 and less apt to close up on you.:)

digitalplumber 09-26-2012 09:06 PM

Quote:

Originally Posted by jschaben (Post 1018087)
According to the CAD drawings at McMaster Carr, the ID of 1/2" galvanized is .622" and the ID of 1/2" cpvc is .526. Of couse, with the propensity galvanized has to crud up, they are likely about even. Personally, I would recommend 3/4" cpvc, ID .722 and less apt to close up on you.:)



So are you saying from the 1 inch main supply line, each fixture gets a 3/4 inch supply? so I guess you would have to use a reducer to go from 3/4 to 1/2 which is the normal fixter inlet right?

joecaption 09-26-2012 09:20 PM

You run a 3/4 main line then tap off with 1/2 to the fixtures.
I have not seen galvinized pipe used for new constrution plumbing in at least 10 years.
I use Pex, faster, less fittings so less chances of a leak. I could run 100 ft. if need be with no couplings.

jschaben 09-26-2012 09:50 PM

Quote:

Originally Posted by digitalplumber (Post 1018110)
So are you saying from the 1 inch main supply line, each fixture gets a 3/4 inch supply? so I guess you would have to use a reducer to go from 3/4 to 1/2 which is the normal fixter inlet right?

Yep, that's exactly what I was saying. However, if it were me and replacing everything as it appears you are. I would just keep it at 1" and step down to 1/2" at each fixture. Every time you step down the size, you step up the pressure but step down the volume. Keeping the 1" main size as long as possible before stepping it down should give you the most consistent pressure and volume at every outlet. I'm not a plumber but that's the way I'd do it or have it done. :)

plummen 09-26-2012 11:53 PM

Quote:

Originally Posted by joecaption (Post 1018126)
You run a 3/4 main line then tap off with 1/2 to the fixtures.
I have not seen galvinized pipe used for new constrution plumbing in at least 10 years.
I use Pex, faster, less fittings so less chances of a leak. I could run 100 ft. if need be with no couplings.

I can run a 100' roll of k-copper also with no leaks,no pex allowed in omaha yet anyway:laughing:
Ironically I could run 500' of copper with tons of fittings with no leaks,then theres those occasional days that I feel like i should bury my torch and buy a bunch of those nasty shark bite things!

plummen 09-26-2012 11:59 PM

Quote:

Originally Posted by jschaben (Post 1018152)
Yep, that's exactly what I was saying. However, if it were me and replacing everything as it appears you are. I would just keep it at 1" and step down to 1/2" at each fixture. Every time you step down the size, you step up the pressure but step down the volume. Keeping the 1" main size as long as possible before stepping it down should give you the most consistent pressure and volume at every outlet. I'm not a plumber but that's the way I'd do it or have it done. :)

All that 1" and fittings get pricey really fast,unless your going a really long ways or trying to feed lots of fixtures off each trunk line Id stick with the 3/4" then drop it down before each fixture :wink:

TheEplumber 09-27-2012 12:11 AM

Quote:

Originally Posted by digitalplumber (Post 1018039)
Looking at using cpvc to replace galvanized in remodel. My question is, will half inch cpvc deliver same volume as half inch galvanized? Sure does not look like it?

This just my opinion- forget the cpvc. To me- it's junk. Use pex if you can't afford or want copper.
There's no need to oversize the pipes when it's not necessary- you're wasting money in material and wasting extra hot water that is delivered to the system but not used. A 3/4 line should supply at least bathroom- assuming your pressure is adequate and the run is not too long.

jschaben 09-27-2012 12:35 AM

Quote:

Originally Posted by plummen (Post 1018203)
All that 1" and fittings get pricey really fast,unless your going a really long ways or trying to feed lots of fixtures off each trunk line Id stick with the 3/4" then drop it down before each fixture :wink:

Hmm, I didn't think there was that much difference in the fittings; elbows, connectors, reducers and like that. Getting into shutoffs and such, I'd agree. Of course, my house isn't that large, I could run the 1" every where practical with about 40 ft of the stuff.

plummen 09-27-2012 07:31 AM

Quote:

Originally Posted by jschaben (Post 1018219)
Hmm, I didn't think there was that much difference in the fittings; elbows, connectors, reducers and like that. Getting into shutoffs and such, I'd agree. Of course, my house isn't that large, I could run the 1" every where practical with about 40 ft of the stuff.

When you start figuring the pipe in there it all starts to add up rather fast,That seems to be one of the biggest reasons people want to run that nasty pex stuff is the cost of copper and fittings.
I get people that complain about the cost of a 3/4" copper drip leg on a water heater,they think I should use cpvc on everything to save them money! :whistling2:
Thats a big chunk of the reason I dont do residential new construction,besides the fact its so boring! :laughing:

digitalplumber 09-27-2012 09:14 AM

Thanks everyone, this is one of those projscts that is done a little at a time.

We are in the process of complete remodel of the master bath. Next will be the guest bath, which is down the hall.

So we are not oppose to spending the cash to do this correctly. My main concern is not to reduce or changed volume, which is what 1/2 inch CPVC and Pex may do?

I was going to just use CPVC all throughout since it is rated better: for both hot and cold. (I know it is over rated for cold)

TheEplumber 09-27-2012 10:07 AM

Quote:

Originally Posted by digitalplumber (Post 1018338)

I was going to just use CPVC all throughout since it is rated better: for both hot and cold. (I know it is over rated for cold)

IMO, cpvc is over rated. I think it was pulled from the shelves years ago- hard to find around here.

ben's plumbing 09-27-2012 07:32 PM

agree wih eplumber..cpvc is way over rated...use 3/4 pex with 1/2 branches to fixtures.....no need to over size or waste material.....ben :yes:

joecaption 09-27-2012 07:40 PM

I have not seen a new house or addition done with CPVC or copper for many years around here.
Far less chance of it bursting if it ever freezes, no way to set anything on fire are more reasons to do it.


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