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Schedule 40 vs. Schedule 80 for Wet Returns

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Mike11
Mike11 Member Posts: 15
in THE MAIN WALL
We are starting a project where the owner wants to replace the wet returns. Any thoughts on using Schedule 40 or Schedule 80 for a low pressure (less than 2-psig) system. The wet returns are all 2-inch.

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  • icesailor
    icesailor Member Posts: 7,265
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    You're not asking about using PVC pipe are you?
    Mike11
  • Mike11
    Mike11 Member Posts: 15
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    Sorry, no. I should have been more specific. I'm looking to use threaded carbon steel piping.
  • icesailor
    icesailor Member Posts: 7,265
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    Sch. 80 is heavy pipe. It has a smaller Inside diameter, You have to upsize the pipe because of the smaller ID. Plus it is very expensive.
    jonny88Mike11
  • KC_Jones
    KC_Jones Member Posts: 5,739
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    Another option for WET returns is copper. I wouldn't do sch 80 the sch 40 should last beyond the life of the homeowner.
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
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    icesailor
  • Larry_52
    Larry_52 Member Posts: 182
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    KC_Jones said:

    Another option for WET returns is copper. I wouldn't do sch 80 the sch 40 should last beyond the life of the homeowner.

    X2 on the transition to copper.
    icesailorMike11
  • Mike11
    Mike11 Member Posts: 15
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    Awesome, confirmed my thoughts on this issue. Thank you!
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,550
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    Schedule 80 is standard procedure for steam condensate piping in commercial and industrial plants. I can't say I have ever seen it used in a house. It will last longer though. The difference in diameter is not enough to be concerned with.

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