
Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Community
Ask the community for help and clear up your study doubts
Discover the best universities in your country according to Docsity users
Free resources
Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors
This is a later assignment to a flow systems class that involves velocity and flow.
Typology: Assignments
1 / 1
This page cannot be seen from the preview
Don't miss anything!
1. A water supply system is designed as shown in the diagram. Two pumps with the same characteristics supply the water. The pumps are operated in parallel and station losses are approximately equal to 1.5Q^2 in each branch (Station losses are individual branch losses). All other losses are “seen” by both pumps. All minor losses except the exit loss are represented in the station loss term.
Pump characteristics: Capacity (ft^3 /s) Head (ft) 0.0 400 1.0 385 2.0 350 3.0 280 4.0 170 5.0 20
Graph (please make the graph large and use a spreadsheet to prepare the graph): (a) The pump head curve of one pump. (b) The branch head loss curve for one branch. (c) The modified pump head curve of one pump branch. On a second graph, show: (d) The modified pump head curve of one pump branch (repeat part c on second graph) (e) The modified/combined pump head curve for two pumps in parallel. (f) The system head curve.
Show the operating point of the system (give the discharge and head), and the operating point of each pump – remember that the pump operating point is found on the pump head curve, not the modified pump head curve.
2. Now put the pumps given in problem 1 in series. Assume that station losses are 1.5Q^2 , but now station losses should be added to the system head curve since the pumps are no longer in parallel.
On a third graph show: (a) The pump head curve of one pump. (b) The combined pump head curve for two pumps in series. (c) The new system head curve.
Show the operating point for the system (give the discharge and head), and the operating point of each pump – this time there is no modified pump curve to worry about.
Which of the two systems (parallel or series pumps) provides a larger discharge to the upper reservoir?
El. 0’
El. 100’
D = 1’ L = 10000’ C = 120
Water is pumped from tank to upper reservoir.
Pumps in parallel