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Thread: Need advice - changing pipe size

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    Need advice - changing pipe size


    Just bought a new Waterway 1.5 hp 2-speed pump. I am thinking about changing out my 1.5" piping from the 2 supplies to pump to 2" from the supply tee coming out of ground to the pump (approx 4'). Also, change the 1.5" return to 2" to my 2-1.5" tee returns. Is there any benefit in doing this in terms of more flow and/or pressure?

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Need advice - changing pipe size

    Yes, increasing the pipe size will improve the flow rate. The amount of improvement depends on how much pipe you replace. If you only replace a few feet you will only see a small improvement. If you will be working on that section of pipe anyway then it is essentially always worth upgrading from 1 1/2" to 2". If you are doing this just to improve efficiency then it is usually only worth it if you can replace a long run of pipe.
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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Need advice - changing pipe size

    I agree, it is usually not worth the effort unless you are replacing a piece of equipment. Also, keep in mind, that energy use goes up with lower head loss/higher low rate so to take advantage of this increase in efficiency, you must reduce run time or your power bill may go up a little.
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