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A fire protection system is supplied from a water tower with a bent pipe as shown in the figure. The pipe friction f is 0.03. Ignoring all minor losses, the maximum discharge, Q in the pipe is
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- 31.7 lit/sec
- 24.0 lit/sec
- 15.9 lit/sec
- 12.0 lit/sec
Correct Option: B
Apply Bernoulis equation
| + z1 + | = | + z2 + | + h2 | |||||
| ρg | 2g | ρg | 2g |
| 0 + 25 + 0 = 0 + | + h2 | |
| 2g |
| 25 = | + | ||
| 2g | 2gd |
| ⇒ 25 = | + | ||
| 2 × 9.81 | 2 × 9.81 × 0.1 |
∴ V2 = 3.028 m / s
Q = AV
| = |  | × 0.12 |  | × 3.028 | |
| 9 |
= 0.024 m2 / s = 241 /s
