A piping system consists of three pipes arranged in series, the lengths of the pipes are 1200 m, 750 m and 600 m and diameter 750mm, 600 mm, 450 mm respectively. Transform the system to an equivalent 450 mm diameter pipe
- A. 671.3 m
- B. 771.3m
- C. 871.3m
- D. 971.3m
Answer: C. 871.3m
Explanation: Dupuit's equation: $L_e/D_e^5 = L_1/D_1^5 + L_2/D_2^5 + L_3/D_3^5$. With $D_e=450$, $L_e \approx 871.3$m.