Benzene at 37.8°C is pumped at a normal rate of 15 m³/h. The reservoir is at atmospheric pressure. The gauge pressure at the end of the discharge line to a vessel is 330 kPa. The discharge is 3.5 m, and the pump suction is 1.25 m above the level in the reservoir. The discharge line is 2 in. Schedule 40 pipe. The friction in the 3 in. Schedule 40 suction line is known to be 4.0 kPa. Meanwhile, two 90° elbows, two gate valves and a globe valve are installed in the discharge line that is 150 m long. The mechanical efficiency of the pump is 65%. The density of benzene is 865 kg/m², and its viscosity is 0.53 cP. Its vapor pressure at 37.8°C is 26.2 kPa. 1. Calculate (a) the developed head of the pump in m, and (b) the total power input in kW, expressed up to 3 decimal places. (use half open valves) 2. If the pump manufacturer specifies a required NPSH of 3.1 m, will the pump be suitable for this service? Why? Support your answer with calculations (i.e. determine the available NPSH for the pump and compare with the pump manufacturer's requirement).
Benzene at 37.8°C is pumped at a normal rate of 15 m³/h. The reservoir is at atmospheric pressure. The gauge pressure at the end of the discharge line to a vessel is 330 kPa. The discharge is 3.5 m, and the pump suction is 1.25 m above the level in the reservoir. The discharge line is 2 in. Schedule 40 pipe. The friction in the 3 in. Schedule 40 suction line is known to be 4.0 kPa. Meanwhile, two 90° elbows, two gate valves and a globe valve are installed in the discharge line that is 150 m long. The mechanical efficiency of the pump is 65%. The density of benzene is 865 kg/m², and its viscosity is 0.53 cP. Its vapor pressure at 37.8°C is 26.2 kPa. 1. Calculate (a) the developed head of the pump in m, and (b) the total power input in kW, expressed up to 3 decimal places. (use half open valves) 2. If the pump manufacturer specifies a required NPSH of 3.1 m, will the pump be suitable for this service? Why? Support your answer with calculations (i.e. determine the available NPSH for the pump and compare with the pump manufacturer's requirement).
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:Benzene at 37.8°C is pumped at a normal rate of 15 m³/h. The reservoir is at atmospheric
pressure. The gauge pressure at the end of the discharge line to a vessel is 330 kPa. The
discharge is 3.5 m, and the pump suction is 1.25 m above the level in the reservoir. The
discharge line is 2 in. Schedule 40 pipe. The friction in the 3 in. Schedule 40 suction line is
known to be 4.0 kPa. Meanwhile, two 90° elbows, two gate valves and a globe valve are
installed in the discharge line that is 150 m long. The mechanical efficiency of the pump is 65%.
The density of benzene is 865 kg/m², and its viscosity is 0.53 cP. Its vapor pressure at 37.8°C is
26.2 kPa.
1. Calculate (a) the developed head of the pump in m, and (b) the total power input in kW, expressed up to
3 decimal places. (use half open valves)
2. If the pump manufacturer specifies a required NPSH of 3.1 m, will the pump be suitable for this service?
Why? Support your answer with calculations (i.e. determine the available NPSH for the pump and compare
with the pump manufacturer's requirement).
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