The required NPSH of a pump is specified to be 8 ft. Determine the vertical distance above or below the pump axis from a vented surface of water at 25oC in a supply tank if suction side friction losses are equivalent to 3.8 ft.
The required NPSH of a pump is specified to be 8 ft. Determine the vertical distance above or below the pump axis from a vented surface of water at 25oC in a supply tank if suction side friction losses are equivalent to 3.8 ft.
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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Instruction :Solve the problem neatly and systematically. Use free-floating decimals in all your calculations and in expressing your answers. Box your final answers
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1. The required NPSH of a pump is specified to be 8 ft. Determine the vertical distance above or below the pump axis from a vented surface of water at 25oC in a supply tank if suction side friction losses are equivalent to 3.8 ft.
#use the pictures as reference as needed
Transcribed Image Text:NET POSITIVE SUCTION HEAD (NPSH):
the difference between the static head at the suction inlet and the head
corresponding to the vapor pressure of the liquid at the pump inlet
9c (Par – P,
NPSH =
hf suction
- Z.
Pa' = abs. Pressure at the surface of the reservoir
Pv = vapor pressure
Za = height from the surface of the of the reservoir to the suction point in the
where:
pump
Transcribed Image Text:10-78
TRANSPORT AND STORAGE OF FLUIDS
TABLE 10-22 Properties of Steel Pipe
Circumference,
ft, or surface,
ft/ft of length
Capacity at 1-ft/s
velocity
Cross-sectional area
Nominal
pipe
size, in
Outside
diameter,
Wall
thickness,
Weight of
plain-end
pipe, Ib/ft
Inside
diameter,
Schedule
Metal,
in
U.S. gal/
Flow, ft
Outside
Inside
Ib/h water
in
no.
in
in
min
0.307
.269
215
0.00051
.00040
.00025
0.106
.106
0.0804
.0705
0563
0.405
10S
40ST, 40S
SOXS, 8OS
0.049
.068
.095
0.055
.072
0.231
.179
115.5
89.5
56.5
0.19
24
.093
.106
.113
.31
14
0.540
.097
.107
10S
40ST, 40S
SOXS, 80S
.065
.088
.119
.410
.364
.302
.00092
.00072
.00050
.141
.412
323
224
206.5
161.5
33
.42
.54
.125
.095
.079
.141
.157
.141
112.0
.177
.177
.177
363.5
298.0
220.0
0.675
10S
.065
.125
.167
.217
.00162
.143
.129
.727
40ST, 40S
SOXS, 8OS
545
.493
.00133
.00098
.42
.57
.74
.596
.091
.126
.423
.11
.440
0.840
.710
.674
.186
.176
1,234
617.0
58
10S
40ST, 40S
80XS, 8OS
160
XX
.065
.083
.109
.158
.197
.250
.320
.385
.504
.00275
.00248
.00211
.00163
.00117
220
220
.220
220
.220
.220
1.112
0.945
0.730
0.527
0.155
556.0
472.0
365.0
263.5
77.5
.54
.67
.85
1.09
1.31
1.71
.622
.546
.147
.188
.294
.163
.143
.122
.066
464
252
.00035
1036.0
951.5
832.5
672.5
458.5
230,5
0.69
0.86
.065
.275
.275
275
.275
.275
.275
1.050
58
10S
40ST, 40S
80XS, 8OS
.920
.884
.824
.742
.612
434
.201
.252
.333
.433
.572
.718
.00461
.00426
.00371
.00300
.00204
.00103
241
.231
.216
.194
.160
.114
2.072
1.903
.083
.113
.154
.219
1.665
1.345
0.917
0.461
1.13
1.47
1.94
2.44
160
XX
.308
.00768
.00656
.00600
.00499
.00362
.00196
1.185
1.097
1.049
.255
.413
1725
1473
1345
1120
812.5
439.0
0.87
1.40
1.68
2.17
2.84
1.315
.065
.344
.344
344
.344
.344
3.449
2.946
2.690
2.240
1.625
0.878
1
5S
10S
40ST, 40S
SOXS, SOS
.109
.133
.179
.250
.494
.639
.836
1.076
310
287
275
250
.213
157
160
XX
0.957
0.815
0.599
358
.344
3.66
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