Page 235 - Chemical engineering design

PIPING AND INSTRUMENTATION
Dynamic head
As an initial value, take the fluid velocity as 1 m/s, a reasonable value. 211
3 2 3 2
Cross-sectional area of pipe D 80 ð 10 D 5.03 ð 10 m
4
3
Volumetric flow-rate D 1 ð 5.03 ð 10 3 ð 3600 D 18.1m /h
900 ð 1 ð 80 ð 10 3 4
Reynolds number D D 5.3 ð 10 5.4
1.36 ð 10 3
Relative roughness D 0.46/80 D 0.0006
Friction factor from Figure 5.7,f D 0.0027
3
Length including miscellaneous loses D 100 C 600 ð 80 ð 10 D 148 m
148 1 2 2
Pressure drop,P f D 8 ð 0.0027 ð 900 ð D 17,982 N/m
3
80 ð 10 2
D 17,982/ 900 ð 9.8 D 2.03 m liquid 5.3

Total head D 9.4 C 2.03 D 11.4m

30.0

25.0
Pump curve
Efficiency
77
20.0 79
Liquid head, m 15.0 80 79 77

10.0
System
curve
5.0

0.0
0 10 20 30 40 50 60 70 80
3
Flow-rate, m /h
Figure A. Example 5.3