How do I calculate the friction heads, indicated with the RED ARROW

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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How do I calculate the friction heads, indicated with the RED ARROW
Given the pump characteristics as follows, determine the pump efficiency and
power requirement for a pipeline of diameter 300 mm, length 5 km, roughness 0.03
mm and a static lift of 10 m. Comment on the suitability of this pump and pipeline
combination.
Pump characteristics
Discharge (L/s) 0
10
20
30
40
50
60
70
Head (m)
26.25 24.00 21.75 19.50 17.50 15.00 11.75
6.75
Efficiency (%)
28
51
68
80
85
80
64
Solution
(a) Determine the pipeline characteristic by finding the frictional losses at the dis-
charges given in the earlier table. These are most readily found using the HRS
charts or tables.
Pipeline characteristics
Discharge (L/s)
20
30
40
50
60
70
Friction head (m)
1.35
2.8
4.7
7.25
9.75
13.5
Friction+static head (m)
11.35
12.8
14.7
17.25
19.75
23.5
Transcribed Image Text:Given the pump characteristics as follows, determine the pump efficiency and power requirement for a pipeline of diameter 300 mm, length 5 km, roughness 0.03 mm and a static lift of 10 m. Comment on the suitability of this pump and pipeline combination. Pump characteristics Discharge (L/s) 0 10 20 30 40 50 60 70 Head (m) 26.25 24.00 21.75 19.50 17.50 15.00 11.75 6.75 Efficiency (%) 28 51 68 80 85 80 64 Solution (a) Determine the pipeline characteristic by finding the frictional losses at the dis- charges given in the earlier table. These are most readily found using the HRS charts or tables. Pipeline characteristics Discharge (L/s) 20 30 40 50 60 70 Friction head (m) 1.35 2.8 4.7 7.25 9.75 13.5 Friction+static head (m) 11.35 12.8 14.7 17.25 19.75 23.5
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