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Insulation on return lines.
My building is having new insulation put on our steam mains in the basement. While preparing for the work to begin (clearing out storage bins etc.), I found that a number of sections of the return lines were insulated. This is not the case everywhere, such as the high traffic areas, which lead me to believe that at one point they were but somewhere along the line people removed some insulation. My question is should we have all of the exposed return lines re-insulated? I have looked around the site and found a discussion or two that questions such a tactic, but I could not find much in the way of a definitive answer. Here is some info that may help:
The building is from the 1920s, the system is one pipe. My first thought was that none of the return lines were insulated, mostly because the returns I was able to see were in the main corridor and laundry room. Now that I see differently, should we re-insulate all of the lines, just replace the insulation only where it is, or remove the insulation from all return lines? Also, there are just some places that we will not be able to insulate, such as in the super's apartment the return is tucked away inside a wall (although that provides a small amount of insulation I suppose). Any thoughts on the subject would be helpful. Please let me know if you need more info. Thanks.