. Graphical and mechanical computation. Fig. 49c. 94 NOMOGRAPHIC OR iVLIGNMENT CH.\RTS Chap. IV same modulus. Because of the restriction on the choiceof moduli, this typeof chart is not a very useful one. We shall only give a single illustration. 20 - /e ->e \-io. FR/CT/ON LOSS /N P/PES LOST HEAD = 2cfg Fig. 50. 20-^ flv 50. Friction loss in flow of water. H = ^-^. — Here / is the length of pipe in ft., v is the velocity in ft. per sec, d is the internal diameter ofpipe in ft., H is the lost head in ft. due to friction, / is the friction factor,and g = Art. so FRICTION LOSS IN FLOW OF
. Graphical and mechanical computation. Fig. 49c. 94 NOMOGRAPHIC OR iVLIGNMENT CH.\RTS Chap. IV same modulus. Because of the restriction on the choiceof moduli, this typeof chart is not a very useful one. We shall only give a single illustration. 20 - /e ->e \-io. FR/CT/ON LOSS /N P/PES LOST HEAD = 2cfg Fig. 50. 20-^ flv 50. Friction loss in flow of water. H = ^-^. — Here / is the length of pipe in ft., v is the velocity in ft. per sec, d is the internal diameter ofpipe in ft., H is the lost head in ft. due to friction, / is the friction factor,and g = Art. so FRICTION LOSS IN FLOW OF WATER 95 If we replace g by ,/by (for clean cast-iron pipes) and expressd in inches, our formula becomes „ _ lv~ (12) H _v- 2 () d I d or (log H + log ) — log / = 2 log y — log d an equation of the form (VII). We shall arrange the axes as in Fig. scales are ac = mi (log IZ +log ), y = mi log I, z = mi {2 log v), t^m^logd^ The following table exhibits the limits of the variables and the equationsof the scales: Scale Limits Modidus Equation Le) H to 20 mi = 5 X = slogH 8 I 20 to 1000 mi = 5 >» = 5 log ; 8 V 2 to 10 mi = 5 2=10 log V 7 d I to 24 mi = 5 t = 5logd r We lay ofif the /- and (/-scales on o
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