Pipe diameter and water

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Cscjjd

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Hello,

My question is about pipe diameters and how it affects available water in the home. I will be replacing a 35 foot section of supply line which is connected to 1” diameter pipe on the supply end and 3/4” at the other end (going into the home).

If I use 35 feet of 1” pipe followed by a 1” x ¾” coupling, will I get better available water into the home than if I just use 35 feet of ¾” pipe?
 

Sylvan

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I would run the 1" all the way just incase you need more volume such as irrigation
 

Cscjjd

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Thanks for the reply Sylvan – a great suggestion in general however in my specific case I won’t be having any additional future add-ons.

I guess my question gets down to this: will I have better water availability in the house if I keep the pipe 1” for the greatest length possible or does a short section of smaller diameter pipe wipe out any benefit from using the larger diameter pipe?
 

Terry

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A two bath home gets a 1" supply. The smaller 3/4" pipe has friction loss that really cuts down what can come out at the end.

water-sizing-chart-terrylove-40-60.jpg
 

Reach4

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f I use 35 feet of 1” pipe followed by a 1” x ¾” coupling, will I get better available water into the home than if I just use 35 feet of ¾” pipe?
Yes. Pressure drops add.

If you are used to electronics, it is a little like two resistors in series.
 

John Gayewski

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Hello,

My question is about pipe diameters and how it affects available water in the home. I will be replacing a 35 foot section of supply line which is connected to 1” diameter pipe on the supply end and 3/4” at the other end (going into the home).

If I use 35 feet of 1” pipe followed by a 1” x ¾” coupling, will I get better available water into the home than if I just use 35 feet of ¾” pipe?
Yes you will get better performance. Although wether that matters or not will be highly dependent on how fixtures and appliances addres used and in what combination.
 

10fingers

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I would run the 1" all the way just incase you need more volume such as irrigation
I have a 1" suction pipe into the jet pump and a 1/2" fitting coming out to the pressure tank. Based on volume demands eg., watering horse trough, I would add more volume to the tank and stabilize the water pressure if I switch from 1/2" to 1" ?
 
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