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How do I connect my header to the main steam lines correctly?
I am replacing my old Weil McLain LGB-7 steam boiler with an LGB-6 and am not sure how to properly connect the header to the main steam lines. The Weil McLain manual says to use one 4 inch riser to the header with a 2 inch equalizer. I have a 3 inch main running to the front of the building and a 3 inch main running to the rear of the building. Do the take-offs from the header need to be the same diameter as the main lines? For example, would 2.5 inch take-offs which run to the 3 inch mains be appropriate or do the take-offs need to be 3 inch diameter as well? There used to be one 4 inch take-off that went into a "T", but I am putting 2 take-offs in the new header system to avoid slamming the steam into a "T". Is this a good idea? Is it correct for me to have 2 separate take-offs from the header, one for the front of the building and one for the rear of the building? What should the slope of the take-offs have? I have a wet return system. Should the pipes running from the header slope downwards, upwards, or be level? There is a steel beam running through the room which interferes with the height at which we can run the take-offs from the header. Is it better to pipe over the beam, through the beam, or under the beam? If we pipe under the beam and have to run our pipe down and then back up, is it appropriate to use a trap to drain the water?