Posted by Ted on February 05, 2000 at 11:41:05:
I am a little confused on "B" dimension. I have a two pipe steam and have had a new boiler installed. I am getting good heat on the first two floors, but the third floor of is not heating adequately. I get some water hammer in the middle of the heating cycle. I have been researching and I think the culprit is this "B" dimension. I know my boiler water level in relation to the wet return has been changed. I have also read where a two pipe setup has an F&T trap. I do not have this. I do, however, have a setup that looks like a U that connects the end of main steam to the bottom of the dry return. This U also contains air vents on them, two Hoffman 75's on the dry return side and 1 Hoffman 75 on the steam side. However, the bottom of this U would have been below the water line with the old boiler setup. So essentially the 3 air vents are connected to the end on steam main. My questions are 1) Should the bottom of the U be below the water line to prevent steam from entering into the dry return? 2. Should I install an F&T trap at the end of main? I know I am getting some steam into the dry return and I think this is why my pressure is building and tripping the pressuretrol. All advise is greatly appreciated.