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steam traps

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wbjeff
wbjeff Member Posts: 5
in Strictly Steam
Hi, we are replacing a 100,000 btu steam coil in a duct system. previous contractor had installed a 3/4" float type steam trap on a single pipe steam system with wet returns. Do we need to reuse the steam trap
thanks

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  • Dave in QCA
    Dave in QCA Member Posts: 1,785
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    On a single pipe system with the outlet of the coil discharging to a wet return, with NO condensate receiver, but rather a gravity return to boiler, there should be NO trap on the outlet of the heater. However, the outlet should have a vent installed, such as a Hoffman 74. It should be configured so that it is even with the top of the coil.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • Dave in QCA
    Dave in QCA Member Posts: 1,785
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    Here is a picture of it. Shows a unit heater, but a coil would be piped the same.
    Dave in Quad Cities, America
    Weil-McLain 680 with Riello 2-stage burner, December 2012. Firing rate=375MBH Low, 690MBH Hi.
    System = Early Dunham 2-pipe Vacuo-Vapor (inlet and outlet both at bottom of radiators) Traps are Dunham #2 rebuilt w. Barnes-Jones Cage Units, Dunham-Bush 1E, Mepco 1E, and Armstrong TS-2. All valves haveTunstall orifices sized at 8 oz.
    Current connected load EDR= 1,259 sq ft, Original system EDR = 2,100 sq ft Vaporstat, 13 oz cutout, 4 oz cutin - Temp. control Tekmar 279.
    http://grandviewdavenport.com
  • jumper
    jumper Member Posts: 2,260
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    3/4" sounds large for fractional gpm.

    Unit heater manufacturers state that two pipe is required. But I believe that I've seen them used with one pipe. Heater is above pipe and both heater connections are used. I don't think that trap is called for. Generally boiler feed is de-aerated.

    The fan controls heater output.
  • wbjeff
    wbjeff Member Posts: 5
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    Everone, thanks for the input...jeff

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