Document qa29x8aRB4Xo5zxe50pV2VLxR

American Society of Heating and Ventilating Engineers Guide, 1928 Tempcsature or Water in Flow Bijce Chapter IV--Hot Water Heating Systems and Piping the friction heads in the pipe and- in the elbows can be calculated by known formulae, or, they can be determined more readily from the diagrams of Figs. 7 and 8. It will be noted from Fig. 7, that for a on11' pipe, for 12,000 B.t.u. per hour, and' for a temperautre drop of 20 deg., the friction head is 18 milinches per foot of pipe and 35 milinches 128 129