Commercial and Industrial Hot Water / Steam Boilers

    300,000 BTU/H INPUT 600,000/700,000BTU/H
    INPUT    		 800,000/900,000 BTU/H
    INPUT
    SIZING VELOCITY SIZING VELOCITY SIZING VELOCITY
    2" 1.300
    2" 2.300

    3" 2.300
    3" 3.300
    3" 4.300
    3" 5.300
    3" 6.300
    4" 4.300
    4" 5.300
    4" 6.300
    4" 7.300
    4" 8.300
    4" 9.300
    4" 10.300
    4" 11.300
    5" 12.300     		2.5'/SEC
    4.5'/SEC

    2.2'/SEC
    3.2'/SEC
    4.2'/SEC
    5.0'/SEC
    6.0'/SEC
    2.5'/SEC
    2.6'/SEC
    3.6'/SEC
    4.2'/SEC
    4.6'/SEC
    5.2'/SEC
    5.8'/SEC
    6.0'/SEC
    4.3'/SEC     		3" 2.700

    4" 3.700
    4" 4.700

    5" 5.700
    5" 6.700     		5.0'/SEC

    4.5'/SEC
    6.0'/SEC

    4.5'/SEC
    5.7'/SEC     		3" 2.900

    4" 2.900
    4" 3.900
    *4"
    4.900
    *4"
    5.900

    5" 2.900
    5" 3.900
    5" 4.900
    5" 5.900

    6" 2.900
    6" 3.900
    6" 4.900
    6" 5.900
    6" 6.900
    8" 5.900     		6.5'/SEC

    3.7'/SEC
    6.0'/SEC
    6.9'/SEC
    8.5'/SEC

    2.3'/SEC
    3.5'/SEC
    4.7'/SEC
    6.0'/SEC

    1.6'/SEC
    2.5'/SEC
    3.0'/SEC
    3.8'/SEC
    5.0'/SEC
    0.84'/SEC


    Use Black Steel Only! Copper erodes at a velocity above 6 fps. Sizes > 4" Only Available In Black Steel.

    Domestic Hot Water Mains And Manifolds:

    210,000 TO 375,000 BTU/H INPUT 600,000 TO 900,000 BTU/H INPUT
    SIZE NO. OF BOILERS
    (max flow < 6 fps.)    		 SIZE NO. OF BOILERS
    (max flow < 6 fps)
    1 1/2" or 2" Main 1 or 2 (1 1/2")
    1 to 4 (2")    		 2" MAIN 1 or 2

    		Up to 8 3" MAIN Up to 5


    		42" MAIN Up to 8


  • Flow Rate Chart

Mains and Headers

System primary mains (headers and secondary piping manifolds) are critical components of a successful modular boiler system. Quite often, very little time and thought is spent here. Unless there is a compelling reason for fabricating mains at the jobsite, it is likely that TRIAD can manufacture our standard Primary-Secondary mains more efficiently, less expensively, and with higher quality and precision.

Mains can be made in copper or steel and include a header with three Control Bushings and per each boiler two Ball Valves (installed), and one set of Supply and Return Manifold Piping, (shipped loose). All headers are tested at 125psig.

Achieving the proper results with Primary Secondary Piping requires knowledge of the application objectives, limitations imposed by other equipment in the building, limitations of the boiler room, and knowledge of applicable building and boiler room codes. So, qualified engineers and designers, as well as all applicable local building and boiler codes, should be consulted prior to implementing a system design.

Please consult us for more information on this topic.