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Problem 3. The head loss (ft) in a piping system is represented by the equation H, = 50 + %3D 6.0 100 + Hy. The pump to be used has a characteristic curve provided by the manufacturer, Hp = 68 – 0.5 () - 4.5 (), flowrate is in gallons per minute (gpm). (a) Find the flowrate andj pump head 100 100, if two pumps are used in parallel with the valve wide open (H, = 0) and with 5 ft of valve head loss. (b) Find the flowrate and pump head if two pumps are used in series with the valve wide open (H, = 0) and with 5 ft of valve head loss. (c) If a single pump is used with a variable speed motor and no control valve, what impeller speed is required to achieve a flowrate of 80 gpm. Where possible provide plots indicating where the operating point is. Note: When n pumps are connected in parallel each pump has a flowrate of Qrotal/n and the same head (Hs). When n pumps are connected in series each pump has the same flowrate and a pump head of Hs/n.

Problem 3. The head loss (ft) in a piping system is represented by the equation H, = 50 + %3D 6.0 100 + Hy. The pump to be used has a characteristic curve provided by the manufacturer, Hp = 68 – 0.5 () - 4.5 (), flowrate is in gallons per minute (gpm). (a) Find the flowrate andj pump head 100 100, if two pumps are used in parallel with the valve wide open (H, = 0) and with 5 ft of valve head loss. (b) Find the flowrate and pump head if two pumps are used in series with the valve wide open (H, = 0) and with 5 ft of valve head loss. (c) If a single pump is used with a variable speed motor and no control valve, what impeller speed is required to achieve a flowrate of 80 gpm. Where possible provide plots indicating where the operating point is. Note: When n pumps are connected in parallel each pump has a flowrate of Qrotal/n and the same head (Hs). When n pumps are connected in series each pump has the same flowrate and a pump head of Hs/n.

Introduction to Chemical Engineering Thermodynamics
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
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Problem 3. The head loss (ft) in a piping system is represented by the equation Hs = 50 + 6.0 () + Hp. The pump to be used has a characteristic curve provided by the manufacturer, Hp = 100 %3D 2 68 - 0.5()-4.5 (), flowrate is in gallons per minute (gpm). (a) Find the flowrate and pump head 100 100. if two pumps are used in parallel with the valve wide open (H, = 0) and with 5 ft of valve head loss. (b) Find the flowrate and pump head if two pumps are used in series with the valve wide open (H, = 0) and with 5 ft of valve head loss. (c) If a single pump is used with a variable speed motor and no control valve, what impeller speed is required to achieve a flowrate of 80 gpm. Where possible provide plots indicating where the operating point is. %3D Note: When n pumps are connected in parallel each pump has a flowrate of Qtotal/n and the same head (Hs). When n pumps are connected in series each pump has the same flowrate and a pump head of Hs/n.
Transcribed Image Text:Problem 3. The head loss (ft) in a piping system is represented by the equation Hs = 50 + 6.0 () + Hp. The pump to be used has a characteristic curve provided by the manufacturer, Hp = 100 %3D 2 68 - 0.5()-4.5 (), flowrate is in gallons per minute (gpm). (a) Find the flowrate and pump head 100 100. if two pumps are used in parallel with the valve wide open (H, = 0) and with 5 ft of valve head loss. (b) Find the flowrate and pump head if two pumps are used in series with the valve wide open (H, = 0) and with 5 ft of valve head loss. (c) If a single pump is used with a variable speed motor and no control valve, what impeller speed is required to achieve a flowrate of 80 gpm. Where possible provide plots indicating where the operating point is. %3D Note: When n pumps are connected in parallel each pump has a flowrate of Qtotal/n and the same head (Hs). When n pumps are connected in series each pump has the same flowrate and a pump head of Hs/n.
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