Heating Helper

CHAPTER 1 - STEAMONE AND TWO PIPE SYSTEMS - MAINS AND RISERSThe steam system piping recommendations that follow are designed tohelp guide an individual working on existing systems; systems that mayrequire alterations or additions for a variety of reasons. These recommendationsare conservative but in light of many unknown variables,they will serve one well.TWO PIPE STEAM1. STEAM MAIN Capacity in Sq. Ft. E.D.R.Size of Pipe(inches)22-1/234681012Distance of Main100' 200' 300'6501,0301,8603,80011,25022,25040,80066,0004617311,3202,6987,98715,79728,96846,8603755951,0752,1966,50212,86023,58238,148Note: Mains must be pitched for steam & condensate to flow in same direction.2. STEAM RISERSMaximum Capacity (Sq. Ft. E.D.R.) at Various Riser Pitch With.. .Steam and Condensate Flowing in Opposite Direction.Size of Pipe(inches)3/411-1/41-1/22Pitch of Pipe per 10' Length1" 2" 3" 4" 5"22.846.879.6132.0275.228.459.2108.0168.0371.633.269.2125.2187.2398.438.676.8133.6203.2409.6Note: above E.D.R. is maximum. .Greater load will cause problems with increased steam velocities.42.082.0152.4236.8460.03. CONDENSATE RETURN MAINS (Horizontal, Pitched)Capacity based on Sq. Ft. E.D.R. (2 oz. PD per 100")Pipe Size (inches) Dry Return Wet Return11-1/41-1/222-1/2343707801,2202,6604,4208,10017,3809001.5302,4305,0408,46013,50027,90017