The elevation difference is 45 m and a 150 m long

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Unformatted text preview: 5 m, and a 150-m long, cast iron pipe, 35 cm in diameter, is to be used. The suction line is 10 m of the 150 m length. Minor loss coefficients in the suction line add up to 3.7. If Pump III in Figure 5.10 will be used with a speed of 4350 rpm, will the installation susceptible to cavitation? ( ) ) Working conditions of the pump should be decided from the intersection point of the systen curve and pump characteristic curve. Then, from intersection point NPSHR should be determined. 4 System Curve Data V 0 0.12 0.45 1.02 1.80 0 40 80 120 160 0 0.42 0.43 1.25 1.66 From Figure 5.10 f 45 45.12 45.45 46.02 46.80 Q = 110 L/sec 5m + = + – – Pump elevation: 1 – 3 m < 4.75 m No cavitation 5 H = 47 m 0 0.0205 0.019 0.019 0.0189...
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