The pumping system shown below consists of a suction pipe of length 3m and diameter 80mm; delivery pipe of length 6m and diameter 80mm; 4 elbows, each with a loss coefficient of k = 0.3; total static lift = 6m; tank entry and exit loss coefficients 0.5 and 1.0, respectively; suction and delivery pipe friction factor f = 0.007Darcy. A Robuschi 150-500 pump rotates at 1470 rpm and the desired flow rate is a minimum of 200 m/h. Complete the following tasks: 1. Draw the system curve as described above on the Roubuschi pump curve data sheet supplied. Work in increments of Q 50m/h starting at 0 (7-point curve) 2. Would you advise the client to select the 400 or 460 impeller? Give two reasons for your answer. If the 400 impeller is used: Assume: • the gauge pressure in the suction tank at 115 kPa, • the vapour pressure of the water at its average operating temperature at 20C • suction height as 1.5 m. 3. Is the pump likely to cavitate? Support answer with a NPSH calculation approach. 4. Describe two steps that could be taken to reduce the likelihood of cavitation.

The pumping system shown below consists of a suction pipe of length 3m and diameter 80mm; delivery pipe of length 6m and diameter 80mm; 4 elbows, each with a loss coefficient of k = 0.3; total static lift = 6m; tank entry and exit loss coefficients 0.5 and 1.0, respectively; suction and delivery pipe friction factor f = 0.007Darcy. A Robuschi 150-500 pump rotates at 1470 rpm and the desired flow rate is a minimum of 200 m/h. Complete the following tasks: 1. Draw the system curve as described above on the Roubuschi pump curve data sheet supplied. Work in increments of Q 50m/h starting at 0 (7-point curve) 2. Would you advise the client to select the 400 or 460 impeller? Give two reasons for your answer. If the 400 impeller is used: Assume: • the gauge pressure in the suction tank at 115 kPa, • the vapour pressure of the water at its average operating temperature at 20C • suction height as 1.5 m. 3. Is the pump likely to cavitate? Support answer with a NPSH calculation approach. 4. Describe two steps that could be taken to reduce the likelihood of cavitation.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Pressurized pipe flow

A 15-kilometer-long pipe with a pipe diameter of one meter transports water at a speed of one meter per second. The pipe has a friction coefficient of 0.005. Calculate the frictional head loss?

Question

The pumping system shown below consists of a suction pipe of length 3m and diameter
80mm; delivery pipe of length 6m and diameter 80mm; 4 elbows, each with a loss
coefficient of k = 0.3; total static lift = 6m; tank entry and exit loss coefficients 0.5 and 1.0,
respectively; suction and delivery pipe friction factor f = 0.007 Darcy. A Robuschi 150-500
pump rotates at 1470 rpm and the desired flow rate is a minimum of 200 m³/h.
SUCTON E
Complete the following tasks:
1. Draw the system curve as described above on the Roubuschi pump curve data
sheet supplied. Work in increments of Q 50m³/h starting at 0 (7-point curve)
2. Would you advise the client to select the 400 or 460 impeller?
Give two reasons for your answer.
If the 6400 impeller is used:
Assume:
• the gauge pressure in the suction tank at 115 kPa,
• the vapour pressure of the water at its average operating temperature at 20C
• suction height as 1.5 m.
3. Is the pump likely to cavitate? Support answer with a NPSH calculation approach.
4. Describe two steps that could be taken to reduce the likelihood of cavitation.

BYLAE
ANNEXURE
Verandering van sommige Eienskappe van Water met Temp. Variation of Some Properties of Water with Temp,.
Temperature Density.p Viscosity,u Kinematic
Viscosity,u
Vapour pressure Bulk Modulus
of elasticity, K
Surface
Tension,o
head,
1°C]
Įkg/m')
(kg/m-s]
(m³/s]
ĮN/m]
|m}
|MPa]
999,9
1,792 (x10") 1,792 (x10“) | 7,62 (x10°)
0,06
2040
1000
1,519
1,519
7,54
0,09
2060
10
999,7
1,308
1,308
7,48
0,12
2110
15
999,1
1,140
1,141
7,41
0,17
2140
20
998,2
1,005
| 1,007
7,36
0,25
2200
25
997, 1
0,894
0,897 7,26
0,33
2220
30
995,7
0,801
0,804
7,18
0,44
2230
35
994,1
0,723
0,727
7,10
0,58
2240
40
992,2
0,656
0,661
7,01
0,76
2270
45
990,2
0,599
0,605
6,92
0,98
2290
50
988,1
0,549
0,556
6,82
1,26
2300
55
985,7
0,506
0,513
6,74
1,61
2310
60
983,2
0,469
0,477
6,68
2,03
2280
65
980,6
0,436
0,444
6,58
2,56
2260
70
977,8
0,406
0,415
6,50
3,20
2250
75
974,9
0,380
0,390
6,40
3,96
2230
0,357
4,86
80
971,8
0,367
6,30
2210
85
968,6
0,336
0,347
6,20
5,93
2170
90
965,3
0,317
0,328
6,12
7,18
2160
95
961,9
0,299
0,311
6,02
8,62
2110
100
958,4
0,284
0,296
5,94
10,33
2070

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