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pickup factor

ChrisJ
ChrisJ Member Posts: 16,471
in Strictly Steam
I'm curious whether or not the 1.33 pickup factor assumes uninsulated risers in between floors?



I have risers going from the basement to the second floor and of course they are not insulated and probably won't be for some time if ever.  Should I assume a 1.5 pickup factor for this?  This is a single pipe system.

Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

Comments

  • Greg Maxwell
    Greg Maxwell Member Posts: 210
    Pick up

    I think 25% is more than adequate, unless you have something extremely uncommon.
  • BobC
    BobC Member Posts: 5,512
    1.33 might be too much

    I believe the 1.33 assumes nothing is insulated but i could be mistaken. Assuming this is an old house, the sizing of the system may have assumed open windows in the bedrooms during the winter months.



    Dan wrote a pieces a few years back arguing for undersizing (slightly) rather than oversizing boilers. Perhaps someone on the wall can point you to that article.



    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
  • crash2009
    crash2009 Member Posts: 1,478
    Is this the article

     you were thinking about?  http://www.heatinghelp.com/article/323/Boilers/1551/Taking-Another-Look-at-Steam-Boiler-Sizing-Methods-by-Dave-Boilerpro-Bunnell
  • BobC
    BobC Member Posts: 5,512
    Thats it!

    thanks for the legwork, that is the one I was thinking of. It makes you think just how large a boiler you really do need.



    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
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