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Question on pressure drop for 1 pipe vs 2 pipe system

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  • vapor1
    vapor1 Member Posts: 24
    @motoguy128 , ours is a 2 pipe system - mostly no valves and only one vent which is located at the end of the return mains. I think the system was modified later in life by adding 1 huge convector (North side)- probably the reason for the lazy steam at the furthest convector. The 1/2 hr delay I spoke of is on cold start - it's probably not as bad once the system is warm.
    1920's home, ~947 sq ft EDR mostly convectors in walls behind grills, Utica PEG300CDE net IBR 182300 BTU/HR (760 sq ft), 2 pipe, gravity return, single Webster 0023 Vent Trap (missing stainless ball which allowed vacuum) serving the dry returns and the ends of the steam mains, former condensate pump removed, Warren Webster traps

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