Where can I find a table showing flow volume for water pipe? I'm replacing two iron 3/4" pipes with a single line - a second floor bath & I"m replacing the hot/cold with just a cold supply then splitting and doing a point of use water heater.
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Where can I find a table showing flow volume for water pipe? I'm replacing two iron 3/4" pipes with a single line - a second floor bath & I"m replacing the hot/cold with just a cold supply then splitting and doing a point of use water heater.
Well, it isn't as easy as all that.Quote:
Originally Posted by Aanji
Sizing a potable water system is much more involved.
A few variable a Plumber is required by code to consider are:
1) Pressure at the source/meter.
2) Distance from source/meter to fixture.
3) Pipe size of source/meter.
4) Elevation from source/meter to fixture.
And then of course each fixture is assigned a 'fixture unit number' depending on it's maximum draw.
It's basically an equation where you add up the fixture units being served and then use a chart that takes in the above numbered variables.
And if you're really anal about it, like I am, you also throw in the variable of friction loss added to the equation with each 90 degree change of direction.
This is the message:
Hello Speedball - I have a pretty simple question. What would you use to replace
Two 3/4" water supply lines. My guess is that 1 1/2" is too much.. .
I'm combining supplies to an upstairs bath, thinking I'll split and run the hot
Line to a tankless heater. The house is circa 1888 and existing pipes are iron,
I'll run PEX.
Thanks, aanji
If all you're supplying is three fixtures then I would keep the mains at v3/4". Our codes call for a 3/4" main with 1/2" branch with no more then three fixtures on a 1/2" branch. However, you might wish to run 1" up to the heater takeoff tee. Good luck, Tom
>sticks out tongue<Quote:
Originally Posted by speedball1
Would you still recommend only 1" if the outlet of his source/meter is 3/4", the pressure at the source/meter is 35PSI, the distance from source/meter to the fixtures is in excess of 300 feet with a vertical rise of 45" from source/meter to the fixtures?
And one more fly in the ointment -- What would you recommend if his waterline is only a 3/4" feed?
>chuckles<
And what would you recommend if all of the above applied and one of the fixtures was a jetted whirlpool tub?
Sorry, this recently came up, and I had to turn a job down when the customer balked at installing a storage tank and pressurizing pump in his basement.:D
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