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Thread: Why does it state "Do not reduce pipe size"

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    DIY Junior Member kozaz's Avatar
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    Jan 2010

    Default Why does it state "Do not reduce pipe size"

    I bought a house, it's on a share well. The well pumps water into a holding tank. Everybody has separate lines running from the holding tank to their homes.
    At the home, I have a pressure tank and flowtec pump to pull water from the holding tank.

    I want to replace both the pump and pressure tank. (Leaking and suspecting the bladder in the pressure tank is leaking)

    Factory Advice for Pressure Tank and Pump Plumbing:

    The pressure tank has 1 and quarter inch fitting.
    The pump has a 1 and quarter inch inlet and a 1 inch outlet.

    The manual states "These sizes should not be reduced".

    Plumbing from storage tank to house:

    The PVC pipe from the storage tank to the house runs about 150ft and is 1 inch. This line is then reduced to 3/4 inch copper pipe. This 3/4 inch copper is the home's core plumbing size (it's a manufacture home).

    Current plumbing at the pressure tank and pump:

    The current pressure tank and pump are located next to the house. At this location, there's a "from storage tank" line and a "to house" line both are 3/4 inch copper.

    The current (old) system has the 3/4 inch copper line "from the storage tank" which is increased to 1 inch. Then the pump intake has the 1 and quarter inch reduced to 1 inch (Fitting).

    The pressure tank has the 1 and quarter reduced to 1 inch (fittings), then 1 inch pipe to the 1 inch pump outlet fitting. Then runs as 1 inch pipe, which is further reduced to a 3/4 inch copper line "to the house".

    The current system has ran with the above plumbing setup for at least 5 years with no issues. I also believe that the pressure tank is 7 years old according to the previous owner.


    Should I replace the plumbing between the pump and pressure tank with the recommended pipe size even though the "from storage tank" and "to house" copper lines are 3/4 inch?


    Can I run 3/4 inch plumbing between everything? What are the long term or short term problems I could encounter?

    Sorry for so long, but I'm trying to cover everything in detail.
    House has 2 baths, pressure tank is 50 gallons, pump is 3/4 hp, and only 2 people live in the home.

    Last edited by Terry; 04-03-2010 at 09:37 AM.


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