Recirc system add a loop

Discussion in 'General Plumbing Help' started by hardwite, Mar 9, 2019.

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  1. Mar 15, 2019 #41

    frodo

    frodo

    frodo

    Just call me Macgyver Professional Supporting Member

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    I prefer. a simple light switch in the bathroom to energize the 3 way valve when entering the bathroom
     
  2. Mar 15, 2019 #42

    Diehard

    Diehard

    Diehard

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    I am quite familiar with cavitation, NPSH requirements, etc, etc. Part of my job for many years was selecting pumps for various conditions.
    Not sure why you're getting into all this stuff to begin with. I'll try to hold my tongue in the future when tempted to correct someones statements.
     
  3. Mar 15, 2019 #43

    Diehard

    Diehard

    Diehard

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    Not according to my friend frodo. :D
     
  4. Mar 15, 2019 #44

    frodo

    frodo

    frodo

    Just call me Macgyver Professional Supporting Member

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    I do not understand where you get that wild ass idea.. but run with it
     
  5. Mar 15, 2019 #45
  6. Mar 15, 2019 #46

    hardwite

    hardwite

    hardwite

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    Clarification:
    In my system today, the pump is pulling water from the circulation loop and pushing it into the water tank. In other words, the pump is the last component in the loop. I believe the one-lines I posted show this clearly.

    I have seen this arrangement in other system illustrations, and it makes sense: when a faucet is opened, all pump/valve hardware is not part of the flow circuit. Pump/valve hardware are only part of the circuit when water is returning to the tank. The pump also sees lower temperature water, though this should be <10F lower if designed properly.

    I have the following estimates of the existing system and a possible 2-loop system:
    per above, working backwards in the loop:
    • Existing pump to tank is 4 feet
    • From pump to manifold with valves would be 12.5 feet.

    On the other side of the loop flowing with the water:
    • From the tank to the first manifold where the hot water splits to the two loops, would be ~28 feet

    The two loops would change to the following:
    • Loop#1: 160 feet, 11 T fittings
    • Loop#2: 143 feet 4 T fittings and 6 elbows

    Again, still rough values. Here is a pictorial. the 3-way arrow is a possible placeholder for a final design.
     

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