Reading TLAOSH - Revisited, and on page 25, I learned to estimate steam pressure drop at 1 oz per 100 ft of pipe run for a 1 pipe system, and 2 oz / 100 ft for 2 pipe. Is this difference a result of pipe sizing, or is there something else? I read later in the book that in the 1 pipe system, steam would be sharing space with counterflow condensate, and I would expect more resistance, not less.
Also, on page 27 using a Pressuretrol the system in the example is set to operate between 1/2 psig and 1 1/2 psig. Yet with a Vaporstat, the same system is set to 4 oz to 10 oz. Why the difference?
This newbie homeowner thanks you for any help. Stay safe.
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