Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Steam options

NickC Member Posts: 4
I'm involved in a building that has an existing two pipe steam system and they will be upgrading the system.

Two questions,  (1) we need an 87% efficient gas fired steam boiler for a 14 story building with 200 apts. (2) It was mentioned about using orifices to get better efficiency out of the steam system.

whatever information you can offer would be greatly appreciated


  • Greg Maxwell
    Greg Maxwell Member Posts: 212
    Steam Boiler

    What is in there now? Post this on the stritly steam page as well.
  • NickC
    NickC Member Posts: 4
    Steam Boiler

    (2) AL Eastmond FST- 150 currently with a heat exchanger to hot water which will also be eliminated
  • Rod
    Rod Posts: 2,067
    Radiator Orifices

    Hi - Here are a couple of links to discussions on orifices which might be of interest to you.

    Check out the links in the postings as there is some more orifice info there.



    Where are you located?

    - Rod
  • NickC
    NickC Member Posts: 4
    Nick C

    New York,
  • NickC
    NickC Member Posts: 4
    Nick C

    New York,
  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,573
    edited August 2011
    upgrading multi-story steam system

    if you have the wrong "expert" on this job he may think "upgrade" means "increase the steam pressure"! probably, 12 ounces would be a good maximum for this, with a low back-pressure for the venting phase.

    as far as the 87% efficient boiler, you could make hot water with the flue gas, but it may be difficult to get a steam boiler "straight out of the box", with that sort of efficiency, which is usually associated with hot-water heat. in your case, you would need a hot-water boiler on every other floor because of the pressure of 14 floors of water. the efficiency soon gets depleted by the cost of running electric pumps.

    orifices would be a good fit on this, but pay attention to how the air is allowed to escape so the steam can come in. mr gifford [the orifice expert] is a new yorker too, so you could meet him on his home ground.--nbc
  • Steamhead
    Steamhead Member Posts: 15,998
    edited August 2011
    We have a couple similar boilers

    FST-175s with PowerFlame C-series gas burners running full-mod. What burners are on yours? How are they controlled? Are the boilers oversized?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
This discussion has been closed.