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replacing steam boiler

stan_2
stan_2 Member Posts: 12
I would like to replace a large steam boiler with a smaller more efficient one. Much of the load has been disconnected from the existing main and I am a little worried about connecting the new boiler to the old steam main which happens to be 6". What should I look out for when sizing the new boiler? I know what the new load is but how do I compensate for the larger than needed steam main?

Comments

  • Steamhead
    Steamhead Member Posts: 14,842
    Stan, tell us more

    about the system. What was there originally? Why was part of the load disconnected?

    In general, you will have to allow a higher pick-up factor for those big pipes. I'd need to know how much radiation was originally there and how much is there now to get a better idea.

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  • stan_2
    stan_2 Member Posts: 12
    Steamhead, at this time

    I am not sure what the value of the disconnected load is. They are two very large coils in ductwork under a sanctuary of a church. They will not be used again so I'm not figuring them into my calculation. The remaining load is about 1600 square feet EDR. I believe the new boilers header will be about 3" or 4". Maybe I'm reading into this too much. I'm not sure if I should figure a bigger pick-up factor or find a way to calculate the square feet of steam the existing piping system holds then add that to my net load. Thanks for the help!
  • Steamhead
    Steamhead Member Posts: 14,842
    The coils may be disconnected

    but the big pipes are still there! I'd use a 50% pickup on this job since you have more piping in relation to the actual load.

    Size your header, equalizer and Hartford Loop according to the boiler maker's specs and you'll be fine. Also make sure you have the right air vents on the mains.

    If you can, post some pics!

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