Problem 3. The head loss (ft) in a piping system is represented by the equation H, = 50 + 6.0 + H,. The pump to be used has a characteristic curve provided by the manufacturer, Hp %3D 2 68 – 0.5 () - 4.5 (G) , flowrate is in gallons per minute (gpm). (a) Find the flowrate and pump head (100, 0) and with 5 ft of valve head loss. (b) = 0) and if two pumps are used in parallel with the valve wide open (H, : Find the flowrate and pump head if two pumps are used in series with the valve wide open (H, 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 Qtotal/n and the same head (H). When n pumps are connected in series each pump has the same flowrate and a pump head of H,/n.
Problem 3. The head loss (ft) in a piping system is represented by the equation H, = 50 + 6.0 + H,. The pump to be used has a characteristic curve provided by the manufacturer, Hp %3D 2 68 – 0.5 () - 4.5 (G) , flowrate is in gallons per minute (gpm). (a) Find the flowrate and pump head (100, 0) and with 5 ft of valve head loss. (b) = 0) and if two pumps are used in parallel with the valve wide open (H, : Find the flowrate and pump head if two pumps are used in series with the valve wide open (H, 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 Qtotal/n and the same head (H). When n pumps are connected in series each pump has the same flowrate and a pump head of H,/n.
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:Problem 3. The head loss (ft) in a piping system is represented by the equation Hg
50 +
+
+ Hy. The pump to be used has a characteristic curve provided by the manufacturer, Hp =
100
2
68 – 0.5 () -
4.5 () , flowrate is in gallons per minute (gpm). (a) Find the flowrate and pump
head
100,
00
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 Qtotal/n and the same head
(H,). When n pumps are connected in series each pump has the same flowrate and a pump head of H/n.
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