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    Steam Formulas (4 Posts)

  • JStar JStar @ 10:29 AM
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    Steam Formulas

    So, I'm sitting in the office on a Saturday, thinking about steam like usual. Came up with a few quick reference guides for header and vent sizing. This will be a growing list, I'm sure. Feel free to improve my numbers or add to them.





    Steam Formulas and Capacities


    ****Header Size per Maximum BTUH DOE Output****
    (Based on Velocity of 15 ft/sec. to 20 ft/sec. and 1 PSI of pressure)

    2" Header    = 48,384 - 64,512
    2.5" Header = 68,832 - 91,776
    3" Header    = 106,416 - 141,888
    4" Header    = 183,312 - 244,416
    5" Header    = 287,856 - 383,808
    6" Header    = 416,016 - 544,688

    3&4 Section Boilers = 3" Header
    5&6 Section Boilers = 4" Header


     


    ****Steam Venting Practical Capacities****

    GORTON 1
    1-1/2"    @ 25 feet
    2"           @ 15 feet
    2-1/2"    @ 10 feet
    3"          @ 6 feet

    GORTON 2
    1-1/2"    @ 80 feet
    2"           @ 50 feet
    2-1/2"    @ 35 feet
    3"          @  20 feet
    - Joe Starosielec
    732-494-4357
    j.star@thatcherhvac.com
    http://thatcherhvac
    http://facebook.com/thatcherhvac


    Guaranteed performance. Guaranteed energy savings.

    Serving all of NJ, NYC, Southern NY State, and eastern PA.
    Consultation anywhere.
    (Formerly "ecuacool")
    This post was edited by an admin on September 15, 2013 9:11 PM.
  • MarkS MarkS @ 2:26 PM
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    Math please

    Hi Joe, this is interesting stuff. Can you break down the math you used to get these numbers?
    Homeowner, Royersford PA | 1890 one-pipe steam system | 3009 sf | 3 floors | 14 radiators | Utica SFE5200S boiler
    Midco LNB-250 Modulating Gas Burner | EcoSteam modulating controls | 70 to 300 MBH |
    607 sf EDR connected load | Operating pressure: 0.5 oz/in2
    Four main runs (insulated) totaling 135 ft in length | All Gorton vents on mains & rads |
    A Steam Odyssey | Odyssey 2 | Odyssey 2014 | A Steam Enthusiast's Outdoor Reset Control
  • jumper jumper @ 1:50 AM
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    steam drums

    Bigger boilers sometimes had drums. When I think about it now, I wonder how thermal expansion was accommodated.
  • JStar JStar @ 3:11 PM
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    MarkS

    I used the formulas in TLAOSH and the venting charts. I don't have it on hand right now. I'll post my notes later in the week.

    The only numbers I couldn't calculate were header sizing for lower pressures than 1 psi. Your system at 1 oz could probably work with a 1" header!
    - Joe Starosielec
    732-494-4357
    j.star@thatcherhvac.com
    http://thatcherhvac
    http://facebook.com/thatcherhvac


    Guaranteed performance. Guaranteed energy savings.

    Serving all of NJ, NYC, Southern NY State, and eastern PA.
    Consultation anywhere.
    (Formerly "ecuacool")
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