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steam sizing

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ed wallace
ed wallace Member Posts: 1,612
in THE MAIN WALL
stupid question time how many installers add a pic up factor when sizing steam boilers I am looking at a job that has 346sq. feet of steam based on the radiators there is 25 ft of 2in steam pipes running thru out the basement all pipes are insulated can I just use the built in pickup factor from the manufacterer?

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  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,420


    Personally I wound not ad any pick up other than the manufacturers already built in 1.33. That's 33% above the load. Why add more??

    Unless there is unusual piping, or a really large domestic load or uninsulated piping (you already mentioned it was insulated) then maybe??

    Chances are if you do a heat loss calc. the building probably has more radiation than it needs to be adequatly heated and the boiler selected probably does not match the connected EDR exactly so.................

    pick-up factor-- plus more radiation than needed--and closest boiler selection larger than connected load= plenty of fudge already. Don't want to be way oversized.

    JMHO

    Ed
  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    Ed, go with the manufacturer's

    EDR ratings. Unless you can see that a lot of radiation was removed- then you might want to add a bit for the now-oversized piping.

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