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two pipe steam system

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the system does not exceed 629 square feet of radiation, you can use a Mega-Steam.

Simply install a Vaporstat and add a low-pressure gauge when you install the Mega-Steam.

The drops in the basement should be OK, but flush them out to be sure. If the valves are properly adjusted (all radiators heat evenly and no steam in the dry return), you won't need to do anything with them.

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Comments

  • jim_91
    jim_91 Member Posts: 4
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    two pipe steam system

    ran into a steam system today that is differant then most. house built in the late 1800's, two pipe, suppy on top of radiator with a valve, return on bottom without a trap. In the basement I found two loops that go from the ceiling to the floor and back up to the ceiling. this is a two story house. no hartford loop main vent not 15" from drop but right at drop to boiler. boiler in very bad shape and will be replaced this heating season. My question is what are the two loops for? any insight will be apprepiated Thank-you

    Jim
  • Fred Harwood_2
    Fred Harwood_2 Member Posts: 195
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    Two-Pipe

    Sounds like a vapor system, one that runs on less than 8 ounces of pressure, and will need a Vaporstat to control the pressure that closely. Also, the radiator load in EDR should be calculated accurately, the better to size the replacement boiler. If the system is large, the boiler risers should be fully sized to the taps and the header increased to accommodate the second riser, and to match the existing mains. If more than one main, take them off the header one by one.
    The loops sound like dry return seals.
    If you have enough A dimension, you do not need special vents; the dry returns may be open to atmosphere where they drop to the Hartford, if you install one.
    Pictures would be nice.
  • Jamie Hall
    Jamie Hall Member Posts: 23,322
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    no traps

    does sound like vapour. There are several different vapour systems which didn't need traps -- just don't mess with the valves or the radiators, as they are sized together on those systems! (see Dan's book).
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Ken_51
    Ken_51 Member Posts: 18
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    Sounds like a Tudor System

    and the maximum pressure it operates at is 4oz/in2. A picture of the valves will clinch it.

    Vaporstat and low pressure gauge are needed.

    Adjust the steam input to each radiator via the valves. Radiators that get too hot...crank 'em down to Almost off.

    Every cycle, go to each radiator and adjust the valves until all the radiators get hot equally and lock that setting in, if possible.

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  • jim_91
    jim_91 Member Posts: 4
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    can a maga steam be used for this type of system? what would I have to do replace the pressure trol and gauge. will I need to adjust the radator valves to the new boiler. also should I plan on replacing the two drops in the basement. like I would on a wet return? Thank again for your help I have to get Dan's books but this system is in big troble.
  • jim_91
    jim_91 Member Posts: 4
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    one more question please will a hartford loop be needed as there is not one now?
  • Tom Hopkins
    Tom Hopkins Member Posts: 554
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    Is there a return line

    that is below the boiler's water line? If so, than yes, a Hartford Loop is needed.



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  • Steamhead (in transit)
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    Jim, if you can

    take some pics of all the details mentioned here and post them. I, too, think it might be a Tudor system. You can read about the Tudor here:

    http://www.heatinghelp.com/pdfs/492.pdf

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  • Scott Kneeland
    Scott Kneeland Member Posts: 158
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    ???

    Jim
    I know you said there are no traps however at the end of the main ckeck to see if there a small crossover traps? also the drop loops you talked about need to be water sealed watch the new waterline to insure this.

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