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Old 06-20-2015, 08:13 AM  
markalexan
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Default Low Water Volume

We have a new home with a domestic well. The cut pressure is 45psi and the cutoff pressure is about 63psi. The lines from the maniblock are 3/8" pex and the main line to the maniblock is 3/4".

Our problem is that there is low water volume to all faucets and fixtures. My outside hose bibs do not have sufficient flow to even operate a sprinkler. From what I have read the pressure is correct. I measured the static pressure at one of the hose bibs and it was about 58. Is the 3/8" pex too small to provide sufficient flow?


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Old 06-20-2015, 08:22 AM  
bud16415
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I did my whole house with pex to the manifolds and as homerun lines everyplace. I am on city water now but had wells for years at other homes. My pressure and flow loss on these is almost nothing amazing flow and pressure compared to the iron pipes I removed.

I think your problem is the 3/8 pex or the length of runs. More likely the 3/8.

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Old 06-20-2015, 02:01 PM  
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Thanks. I believe that is the issue also. Now getting the contractor to correct the situation will be the challenge.
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Old 06-20-2015, 02:43 PM  
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It would be easy enough to prove out and show him. Chances are the outside lines just run across the basement. Run a 1/2 pex for one of them and see if you get a better result. Your manifold most likely is for 3/8 but you could do a tee off the feed.

PEX is super easy to work with if you have a couple tools. The problem is in a finished home is threading all the tubing in the walls and ceiling. That’s where the builder is going to push back, but if you had a side by side example for him to look at he’s not going to be able to say to much.

Picking the right size tube is tricky. The urge is to go big and have all the flow possible but then you have a lot more water to run thru on the hot’s to get the cold out. Outside water cold only there is no reason to scrimp on tubing size. For me 3/8 is fine going to an ice maker or a toilet anything flow rate isn’t important. Maybe you can work with him rerunning the important stuff by putting in a inch manifold and keeping the 3/8 also for some of the runs.
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Old 06-20-2015, 05:07 PM  
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You should make sure that your valves on the maniblock are opened all the way.
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Old 06-20-2015, 05:30 PM  
joecaption
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No way is 3/8 home runs going to be enough, and any real plumber would have known that.
It has 1/2 the CFM of a 1/2" line, and 1/4 or a 3/4" line.
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Old 06-20-2015, 08:40 PM  
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not knowing your location, i can not tell you what code you are under.

this chart is the MINIMUM pipe size for fixtures. for the Unified plumbing Code [UPC]

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my recommendation, talk to the builder, 1 time, advise him that by code the water piping is not up to code.
if he blows you off. its lawyer time.
send him a registerd letter, giving him 10 days to correct the problem
if at the end of ten days, get a lawyer, show the lawyer the code
he will handle it from there. also...if you really want to stick him good, contact other home owners, tell them to join a class action.
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Old 06-21-2015, 05:16 AM  
beachguy005
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Sizing for pex is based on the fixtures it's attached to. Here's an installation manual which gives you some info.
Note page 99. I have home runs of 1/2" and wish I had 3/8" to the sinks because of wasted water to get to hot.

http://plasticpipe.org/pdf/pex_desig...ter_supply.pdf
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Old 06-21-2015, 08:11 AM  
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you still have to use the code book fixture units to size the pipe size,

just because pex, says you can run 3/8'' 40' does not mean you can run 3/8'' to all the fixtures

the water piping STILL has to be sized according to FU

the UPC CLEARLY states that ALL piping SHALL be minimum 1/2id

that right there,,throws a red flag on 3/8'' [actually 1/4''id]

the way i read the code..3/8'' is not allowed at all


BUT, I am not a "PEX" plumber, I install exclusively copper piping

i run 3/4 copper to 2 fixtures, a 1/2'' tee is only used for air chambers

on my truck...and I have NEVER had a complaint about no volume

I have clients that tell me, "when i turn on the shower,I want it to knock me down"

never has anyone told me I want the water to dribble out, like a 70 year old man taking a leak
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Old 06-21-2015, 09:03 AM  
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That's in reference to copper tubing. PEX is a different animal with different ratings.


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