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Need help or idea!!!

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Steve Ebels_3
Steve Ebels_3 Member Posts: 1,291
Why are you dumping water on a roof in freezing weather? What about ice buildup on the roof?

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  • Cliff M.
    Cliff M. Member Posts: 1
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    Heated pipe

    Hi everybody,
    This message isn't exactly heating related but I do need some ideas regarding heated pipe. I need to run hundreds of feet of pipe or tubing or hose from hose bibbs on a roof of a building branching off in all directions. Each run is no more than 30 feet. Obviously, we need to keep whatever we use from freezing in the winter so what I need to know is, has anyone come across a good application for heated pipe, or a good product to keep my pipe from freezing? Even in the winter, these hose bibbs will flush through a timer twice a day for a certain application so they'll be running in the winter. Thanks a lot guys and gals.
    Cliff
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
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    Can you not set up a sort of "drain back" system where you allow the water subject to freezing in cold weather to drain from the affected piping?
  • ALH_4
    ALH_4 Member Posts: 1,790
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    Recirc

    I would connect the whole setup to an electric water heater (subject to estimated heat load) and essentially run a DHW recirculation loop on each branch or pipe them in series if possible. I would run the recirc pump on a setpoint control that senses the outdoor temperature. As crazy as it sounds, it could even be useful to use a reset control to recirc warmer water when it's colder outside to save energy. Use jacketed pipe insulation to protect it from UV light.
  • Larry Weingarten
    Larry Weingarten Member Posts: 3,384
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    Maybe...

    ... some sort of vacuum breaker in line to allow the system to drain out?

    Yours, Larry
  • Mike T., Swampeast MO
    Mike T., Swampeast MO Member Posts: 6,928
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    One of my thoughts as well Larry. Wish I knew more about the purpose and use. Almost sounds to me like automated irrigation in a low-rise but large ground area collection of penthouses or perhaps even a "green" roof.
  • mtfallsmikey
    mtfallsmikey Member Posts: 765
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    How 'bout

    Self-regulating or thermostat controlled heat tape, then plenty of insulation. That is what I have on my condenser water lines on the roofs of both of my buildings.Never failed yet..run from 277v.
  • Ray_14
    Ray_14 Member Posts: 17
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    Heat tape and insulation is probably the best, but you can only run the tape so long in a run. You would have to have plenty of outlets placed approx. 60-70 feet apart to accomadate that. I would use 1/2" insulation. I would also use Wirsbo Aquapex as it will take a freeze beating without busting. But it is sunlight sensitive. What about a Grundfos 3 speed pump on low to keep the flow going? Just a thought.

    Ray
  • mtfallsmikey
    mtfallsmikey Member Posts: 765
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    But, how could I forget?

    Woodford (?)makes hydrants specifically designed to penetrate thru roofs..has matching pitch pocket fro built-up roof, etc. As far as heat tape is concerned, the commercial grade made by Raychem is excellent. Mine run on 277v.
This discussion has been closed.