. Graphical and mechanical computation . Fig. 49c. 94 same modulusof chart is not NOMOGRAPHIC OR ALIGNMENT CHARTS Chap. IV . Because of the restriction on the choice of moduli, this typea very useful one. We shall only give a single FR/CT/ON LOSS /N P/PES f I v2 LOST HEAD = 2cfg Fig. 50. 20 -1 to Uj fW 50. Friction loss in flow of water. H = —7- H = 1^—. — Here / is the length2 dg 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 FL
. Graphical and mechanical computation . Fig. 49c. 94 same modulusof chart is not NOMOGRAPHIC OR ALIGNMENT CHARTS Chap. IV . Because of the restriction on the choice of moduli, this typea very useful one. We shall only give a single FR/CT/ON LOSS /N P/PES f I v2 LOST HEAD = 2cfg Fig. 50. 20 -1 to Uj fW 50. Friction loss in flow of water. H = —7- H = 1^—. — Here / is the length2 dg 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 „ _ lv2 (12) H _ v2 2 () d / d or (log H + log ) — log / = 2 log v — log d an equation of the form (VII). We shall arrange the axes as in Fig. scales are x = mi (logH-\- log ), y — Wilogl, 2 = mi (2 logy), t = mi\ogd> The following table exhibits the limits of the variables and the equationsof the scales? Scale Limits Modulus Equation Lei H to 20 mi = 5 x = 5 log if 8 I 20 to IOOO Wl = 5 y = 5 log / 8 V 2 to 10 wi = 5 z = 10 log y 7 d 1 to 24 mx = 5 * = 5 log (2 7 W
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