A Process fluid is pumped from the bottom of one distillation column to another, using a centrifugal pump. The line is a standard commercial steel pipe with a 75 mm internal diameter. From the column to the pump inlet the line is 25 m long and contains six standard elbows and a fully open gate valve From the pump outlet to the second column, the line is 250 m long and contains ten standard elbows, and four gate valves (operated fully open). The fluid level in the first column is 4 m above the pump inlet. The feed point of the second column is 6 m above the pump inlet. The operating pressure in the first column is 1.05 bara and that of the second column is 0.3 barg. (i) Draw the system, (ii) determine the operating point on the pump characteristic curve. (iii) determine the NPSH at this flowrate. The physical properties of the fluid are: density 875 kg/m³, viscosity 1.46 mNs.m², and vapour pressure of the fluid at the pump suction is 25 kN/m². Kelbow-0.75, Kvalve 0.17. Flow rate, m³/h Head, m of liquid Pump Characteristic 18.2 27.3 30.8 0.0 32.0 31.4 36.3 45.4 54.5 29.0 26.5 23.2 63.6 18.3

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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A Process fluid is pumped from the bottom of one distillation column to another, using
a centrifugal pump. The line is a standard commercial steel pipe with a 75 mm internal
diameter. From the column to the pump inlet the line is 25 m long and contains six
standard elbows and a fully open gate valve From the pump outlet to the second
column, the line is 250 m long and contains ten standard elbows, and four gate valves
(operated fully open). The fluid level in the first column is 4 m above the pump inlet.
The feed point of the second column is 6 m above the pump inlet. The operating
pressure in the first column is 1.05 bara and that of the second column is 0.3 barg.
(i) Draw the system, (ii) determine the operating point on the pump characteristic
curve. (iii) determine the NPSH at this flowrate. The physical properties of the fluid
are: density 875 kg/m³, viscosity 1.46 mNs.m², and vapour pressure of the fluid at the
pump suction is 25 kN/m². Kelbow-0.75, Kvalve 0.17.
Flow rate, m³/h
Head, m of liquid
0.0
32.0
Pump Characteristic
18.2 27.3
31.4
30.8
36.3
29.0
45.4
26.5
54.5
23.2
63.6
18.3
Transcribed Image Text:A Process fluid is pumped from the bottom of one distillation column to another, using a centrifugal pump. The line is a standard commercial steel pipe with a 75 mm internal diameter. From the column to the pump inlet the line is 25 m long and contains six standard elbows and a fully open gate valve From the pump outlet to the second column, the line is 250 m long and contains ten standard elbows, and four gate valves (operated fully open). The fluid level in the first column is 4 m above the pump inlet. The feed point of the second column is 6 m above the pump inlet. The operating pressure in the first column is 1.05 bara and that of the second column is 0.3 barg. (i) Draw the system, (ii) determine the operating point on the pump characteristic curve. (iii) determine the NPSH at this flowrate. The physical properties of the fluid are: density 875 kg/m³, viscosity 1.46 mNs.m², and vapour pressure of the fluid at the pump suction is 25 kN/m². Kelbow-0.75, Kvalve 0.17. Flow rate, m³/h Head, m of liquid 0.0 32.0 Pump Characteristic 18.2 27.3 31.4 30.8 36.3 29.0 45.4 26.5 54.5 23.2 63.6 18.3
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