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Copper tube thickness for near boiler

rsilvers
rsilvers Member Posts: 182
in Oil Heating
I see that black steel 1-1/2 is about $8 a foot. Copper L is $10. Copper K is $15. 

Which copper would you use to connect the boiler to a hydro separator and then to make manifolds to feed the zone pumps? L or K?


reggi

Comments

  • MikeL_2
    MikeL_2 Member Posts: 459
      I use type m cu. Are you sure you need 1.5" piping?
  • rsilvers
    rsilvers Member Posts: 182
    If I used 1.25 inch I would have about 4.75 fps of water velocity and extra head if I used a 20 degree delta. It would work but the boiler has 1.5 inch threads. 
    Brent H.
  • hot_rod
    hot_rod Member Posts: 19,846
    1-1/4 type M would be workable,a 25 delta would be an option also to lower the flow rate a bit. Nothing sacred about a 20 delta😗
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • rsilvers
    rsilvers Member Posts: 182
    edited April 2022
    I know. 4.6 fps if I do a 20 degree drop. 

    It’s ok, but at the edge. I may end up doing a 25 degree drop but won’t know until it is done and pump settings are being programmed. It’s hard to calculate as it will be outdoor reset. 
  • hot_rod
    hot_rod Member Posts: 19,846
    The are some engineers that will push 5 fps velocity in hydronic systems. Above 5 you start to get some hissing noise. Like when an outside faucet is running full flow.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • bburd
    bburd Member Posts: 680
    There is certainly no reason to use type K copper; that is heavy wall, normally used for underground service.
    —
    Bburd
  • rsilvers
    rsilvers Member Posts: 182
    Yeah. I learned that is the case. I bought L.
    PC7060

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