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, four gate valves (operated fully open), and a flow control valve. 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. Determine the operating point on the pump characteristic curve when the flow is such that the pressure drop across the control valve is 35 kN/m². The physical properties of the fluid are: density 875 kg/m³, viscosity 1.46 mN m2s. Also, determine the NPSH, at this flow-rate, if the vapour pressure of the fluid at the pump suction is 25 kN/m². Head, m of liquid 50 45 40 35 30 25 20 15
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, four gate valves (operated fully open), and a flow control valve. 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. Determine the operating point on the pump characteristic curve when the flow is such that the pressure drop across the control valve is 35 kN/m². The physical properties of the fluid are: density 875 kg/m³, viscosity 1.46 mN m2s. Also, determine the NPSH, at this flow-rate, if the vapour pressure of the fluid at the pump suction is 25 kN/m². Head, m of liquid 50 45 40 35 30 25 20 15
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text: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, four gate valves (operated fully
open), and a flow control valve. 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. Determine the operating point on the pump characteristic curve when
the flow is such that the pressure drop across the control valve is 35 kN/m².
The physical properties of the fluid are: density 875 kg/m³, viscosity 1.46 mN ms. Also, determine the
NPSH, at this flow-rate, if the vapour pressure of the fluid at the pump suction is 25 kN/m².
Head, m of liquid
50
45
40
35
30
25
20
15
10
5
0
05 10 15 20 25 30 35 40 45 50 55
Flow-rate, m3/h
60 65 70
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