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80mm; de coefficient respective

80mm; de coefficient respective

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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PUMP SYSTEM – SYSTEM CURVE AND NPSH The pumping system shown below consists of a suction pipe of length 3m and diameter 80mm; delivery pipe of length 6m and diameter 80mm; 4 elbows, each with a loss coefficient of k = 0.3; total static lift = 6m; tank entry and exit loss coefficients 0.5 and 1.0, respectively; suction and delivery pipe friction factor f = 0.007Darcy. A Robuschi 150-500 pump rotates at 1470 rpm and the desired flow rate is a minimum of 200 m3/h. SUCTION PIPE Complete the following tasks: 1. Draw the system curve as described above on the Roubuschi pump curve data sheet supplied. Work in increments of Q 50m3/h starting at 0 (7-point curve) 2. Would you advise the client to select the p400 or ¢460 impeller? Give two reasons for your answer. If the 400 impeller is used: Assume: the gauge pressure in the suction tank at 115 kPa, the vapour pressure of the water at its average operating temperature at 20C suction height as 1.5 m. 3. Is the pump likely to cavitate? Support answer with a NPSH calculation approach. 4. Describe two steps that could be taken to reduce the likelihood of cavitation.
Transcribed Image Text:PUMP SYSTEM – SYSTEM CURVE AND NPSH The pumping system shown below consists of a suction pipe of length 3m and diameter 80mm; delivery pipe of length 6m and diameter 80mm; 4 elbows, each with a loss coefficient of k = 0.3; total static lift = 6m; tank entry and exit loss coefficients 0.5 and 1.0, respectively; suction and delivery pipe friction factor f = 0.007Darcy. A Robuschi 150-500 pump rotates at 1470 rpm and the desired flow rate is a minimum of 200 m3/h. SUCTION PIPE Complete the following tasks: 1. Draw the system curve as described above on the Roubuschi pump curve data sheet supplied. Work in increments of Q 50m3/h starting at 0 (7-point curve) 2. Would you advise the client to select the p400 or ¢460 impeller? Give two reasons for your answer. If the 400 impeller is used: Assume: the gauge pressure in the suction tank at 115 kPa, the vapour pressure of the water at its average operating temperature at 20C suction height as 1.5 m. 3. Is the pump likely to cavitate? Support answer with a NPSH calculation approach. 4. Describe two steps that could be taken to reduce the likelihood of cavitation.
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