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steam coil piping

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JC_9
JC_9 Member Posts: 2
I have a replacement steam reheat coil 1 1/2" inlet and outlet. Low psi steam. It is a single pass. Looking at it from left to right, there is an inlet in the center of the left side header. On the right side header there is an inlet in the center and at the bottom of that header there is an outlet for condensate. If steam is piped to both inlets, will the condensate drain?? What is the correct way to pipe a coil like this? (there are 2 coils about 38" high and 8' long stacked on top of each other.

Thanks for your help!

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  • Brad White
    Brad White Member Posts: 2,398
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    Need more information

    Do you have the submittal for the coil?

    Some coils as you describe are what are known as "steam distributing coils" and have an injection tube in alternate coil tubes. This gets steam to the ends of every-other tube so that the face temperature is more even. Usually they are piped on the same side. I have never seen one with supply tappings on each end but suspect a distributing style circuiting.

    Hard to tell without manufacturer assistance unless there are header plugs which you can remove and look. Still, I would ask the manufacturer. Maybe it is a quick-ship replacement coil which allows for universal connection ends?

    Beyond that, the usual good practices apply such as a dirt leg for the F&T traps, vacuum breakers, strainers and such as you probably were already planning.

    You said it was a replacement- what was there before?

    Random thoughts.

    Brad
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • JC_9
    JC_9 Member Posts: 2
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    Thanks for your reply Brad. This coil froze and has been supplied by a local coil fabricating company, basically a like for like replacement. I just don't understand how or why there would be 2 steam inlets. It has been piped this way in this make up air unit for some 50 years, (no vacuum breaker either), I am just curious.
  • Brad White
    Brad White Member Posts: 2,398
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    Ask the manufacturer

    At least they are local and good to find such outfits.

    I ask the "what was there?" question because if there was a dual feed (maybe it IS), the existing pipe runouts would still be there to guide you.

    Now, if they had that vacuum breaker, you may not be there and I would not be here discussing it with you. :)
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
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