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I have a 3/4 in. pex water line coming out of my meter to my house. I would like "T" that line and run a 1 in. pipe (or larger) off it. My question is, will I see an increase in flow in the larger pipe since the water is already traveling thought a 3/4 in pipe? I would like more pressure/flow so I can run my larger sprinklers.

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3 Answers 3

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No, running a bigger pipe won’t increase the supply pressure or flow, those losses have already occurred.

But, when you upgrade the supply then that 1" pipe will pay off.

Increasing the diameter will reduce the velocity and therefore the losses.

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  • Put another way, what what happens if I hook a 1in hose up to a spigot supplied by a 3/4 in. line?
    – bmass120
    Jun 24 at 19:11
  • @bmass120 water will flow. But slower in the larger pipe, however the mass flow rate will be constant. The diameter difference governs the velocity change.
    – Solar Mike
    Jun 24 at 19:13
  • So would my sprinkler spray more water further?
    – bmass120
    Jun 24 at 19:23
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As "benefit" you are thinking of more flow and or pressure.

That will not happen, since flow and pressure are already regulated in the supply line (3/4 inch).

However, you might experience a pressure drop.

The distance for the sprinkler depends on sprinkler design and incommoding pressure.

You can make it spray further by reducing the nozzle size.

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  • Interesting.. at the end of the day I just want my sprinkler to spray more water further and possibly have the ability to run 2 or more at the same time.
    – bmass120
    Jun 24 at 19:25
  • @bmass120 pressure pushes the flow, What is your home incoming pressure ? You can increase the flow by increasing the pressure.
    – Ruskes
    Jun 24 at 19:28
  • pressure is about 70 psi.
    – bmass120
    Jun 24 at 19:33
  • @bmass120 that would be sufficient pressure. Try another sprinkler head with smaller nozzles.
    – Ruskes
    Jun 24 at 19:37
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If the line from the meter to the valve box is long, the line will reduce flow and pressure somewhat. A larger line will reduce it less. Whether it's enough to matter is hard to predict. In my area installers always use 1 inch from meter to valve box. Nobody has a 1 inch meter. I don't know why 1 inch is used but on a fixed price irrigation install I assume it gets the installer better results.

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