pumptech customer education - pnws-awwa precon 03... · to prevent damaging cavitation. it is a...
TRANSCRIPT
PumpTech Customer Education
Bellevue Moses Lake Canby
http://www.Pumptechnw.com
Two full time Mechanical Engineers Licensed in OR, WA & ID SolidWorks & E-Drawings Viewer AutoCad Compatible Drawings All Systems UL QCZJ Listed Designed to HI Standards
Manufacturing Facility Canby, OR
Installation, Maintenance & Repair 9 Full Time Service Technicians 3 Full Service Shops 6 Service Trucks 23 Ton Crane Truck 8 Ton Crane Truck 3 Ton Crane Truck 2 Ton Flatbed & Trailer 1 Ton Flatbed & Trailer
Joe Evans, Ph.D
http://www.PumpEd101.com
http://www.Pump-Zone.com
Pump ED 101
Pump ED 101
Centrifugal Pump Training Series
Centrifugal Pump Selection
*
Pump Selection
Pump Quality
Pump Features
Efficiency
NPSH
Curve Shape
Window of Operation
Affinity Laws
Pump ED 101
*
Pump Quality & Features
Pump ED 101
Quality
Price Weight History
Features
Seals Coupling
Materials
Efficiency
BEP
BOP
Pump ED 101
The Performance Curve
BEBOP
*
Motor & Pump Efficiency
Pump ED 101
Pump Efficiency = Fluid Power / Mechanical Power
Motor Efficiency = Mechanical Power / Electrical Power
Total Efficiency = Pump Efficiency X Motor Efficiency
*
Motor & Pump Efficiency
Pump ED 101
Total Efficiency = Pump Efficiency X Motor Efficiency
Motor Pump 10 Bags 9 Bags 7 Bags
90 % 70 % 78 %
0.90 X 0.78 = 0.70 = 70%
Total
*
Pump ED 101
*
Pump ED 101
*
Wide Efficiency Range
Pump ED 101
*
Narrow Efficiency Range
Pump ED 101
*
Wide Efficiency Range
Pump ED 101
*
Pump ED 101
Would You Select This Pump ?
38%
*
Pump ED 101
Vortex Action
*
NPSH - Net Positive Suction Head
Pump ED 101
Two Types – NPSHr & NPSHa
In simple terms, NPSHr is the amount of pressure required at the pump’s suction
to prevent damaging cavitation.
It is a function of pump design.
Pump ED 101 Suction NPSHr @ BEP = 15’
Relatively Low NPSHr
Pump ED 101 Suction
Relatively High NPSHr
Eye Diameter Effect on NPSHr
Pump Ed 101
Suction
Stable Window of Operation
Suction Specific Speed
Pump Ed 101
Suction Recirculation Cavitation
28 Pump Ed 101
Occurs on the high pressure side of the vane
Pump ED 101
Suction Recirculation Cavitation
• A force that acts perpendicularly to the pump shaft
• Forms about the periphery of the impeller due to uneven volute geometry
• A function of total head and the width and diameter of the impeller
• Usually reaches a maximum at or near shut off head
Radial Thrust
Pump ED 101
Pump ED 101
Radial Thrust - Problems
Causes Excess Shaft Deflection
Increased Seal Wear
Increased Wear Ring Wear
Increased Radial Bearing Load
Vibration
Fixes ?
Increase Shaft Diameter or Shorten Overhang
Best Fix – Operate at BEBOP
Radial Thrust versus % BEP Flow
Radial Thrust
0
20
40
60
80
100
120
0 20 40 60 80 100 120 140 160 180 200
Percent BEP Flow
Perc
en
t R
ad
ial T
hru
st
33 Pump Ed 101
Pump ED 101
Radial Thrust Calculator
Off BEBOP Flows - Recirculation
Three types of recirculation can occur when a pump is operated to the left side of the performance curve.
Normal recirculation increases with wear ring clearance & reduced flow.
Suction & Discharge recirculation increase as flow is reduced.
The resulting recirculation cavitation will cause internal damage over time.
38 Pump Ed 101
Pump ED 101 Suction
Wastewater Pump Designs
Nonclog
Vortex
Monovane
Chopper
Pump ED 101 Suction
*
Curve Shape
Pump ED 101
The shape and slope of the performance curve can have a significant effect upon pump selection.
*
PRV Control
153 153 151148
140
179174
167
155
140
0
20
40
60
80
100
120
140
160
180
200
0 50 100 150 200 250 300 350 400
He
ad
in
Fe
et
Gallons Per Minute
Constant Pressure
Pump 1
Pump 2
System
Low Level
Pump ED 101
HP = (flow x head) / (3960 x eff)
12.4 HP
9.9 HP
9 HP
*
Pump Down
4.0
5.9
6.3
7.0
4.6
6.4
6.5
7.0
0
10
20
30
40
50
60
70
80
90
0 100 200 300 400 500 600 700
He
ad
in
Fe
et
Gallons Per Minute
Pump Down
Pump 1
Pump 2
System
Low Level
Data Labels Are BHP
Pump ED 101
*
Pump ED 101
*
Pump ED 101
Parallel Pumps Constant Speed
*
Pump ED 101
*
Pump ED 101
*
Pump ED 101
*
Pump ED 101
*
Pump ED 101
*
Flat Curve
3 4 56
7
8
9
2 3 45
5
6
7
0
10
20
30
40
50
60
70
80
90
100
0 50 100 150 200 250 300 350 400
He
ad
in f
ee
t
Gallons Per Minute
2.5 X 3 X 9 1750 RPM
60hz
55hz
System
Data Label values are BHP
Pump ED 101
*
Steeper Curve
20.328.7
30.5
33.7
35.9
14.422.1
23.5
25.9
27.6
9.816.6
17.7
19.5
20.7
6.412.1
12.9
14.2
15.1
0
20
40
60
80
100
120
140
160
180
0 200 400 600 800 1000 1200 1400
He
ad
in f
ee
t
Gallons Per Minute
4 X 4 X 7B 3450 RPM
60hz
55hz
50hz
45hz
System
74%
81%
81%
Data Labels are BHP
35.6
Pump ED 101
*
Level Control – Power Savings
23
27
29
31
34
33
0
10
20
30
40
50
60
0 750 1500 2250 3000 3750 4500 5250 6000
Head
in
feet
Gallons Per Minute
Pump Down
60hz
System
Low Level
Data Label values are BHP
Submersible Non Clog S12L - 870 RPM - 14.25" Trim
77% ef f0.007 hp/gal
78% ef f0.009 hp/gal
77% ef f0.010 hp/gal
Pump ED 101
*
Level Control – Power Savings
23
27
29
31
34
33
18
21
23
24
26
26
14
16
17
18
20
19
1012
12
13
14
14
0
10
20
30
40
50
60
0 750 1500 2250 3000 3750 4500 5250 6000
Head
in
feet
Gallons Per Minute
Level Control
60hz
55hz
50hz
45hz
System
Submersible Non Clog S12L - 870 RPM - 14.25" Trim
Data Label values are BHP
77% ef f33.2 hp
0.007 hp/gal
78% ef f27.3 hp
0.007 hp/gal
78% ef f21.8 hp
0.007 hp/gal
76% ef f16.8 hp
0.007 hp/gal
65% ef f13.1 hp
0.009 hp/gal
Pump ED 101
*
VFD Control Circulation
Pump ED 101
*
VFD Control Circulation
0
10
20
30
40
50
60
70
80
0 200 400 600 800 1000 1200 1400 1600 1800
Head
in
ft
Gallons Per Minute
Closed Loop Total Friction
Pipe 600ft 8in Steel
Heat Exchanger
Heater
System Curve
Pump ED 101
Closed Loop Circulation vf/vp
0
10
20
30
40
50
60
70
80
0 200 400 600 800 1000 1200 1400 1600 1800
Head
in
Ft
Gallons Per Minute
6 X 6 X 12B VFD Control
60hz
55hz
50hz
45hz
40hz
35hz
30hz
System
3.1 hp 85% 31 hz
22.4 hp 87% 60 hz
8.6 hp 86% 44 hz
Pump ED 101
*
0
10
20
30
40
50
60
70
80
0 80 160 240 320 400 480 560 640
Head
in
Ft
Gallons Per Minute
4 X 5 X 9A VFD Control
60hz
55hz
50hz
45hz
40hz
35hz
30hz
System
1.7 hp 77% 38 hz
3 hp 77% 45 hz
4.9 hp 76% 53 hz
7.5 hp 75% 60 hz
Pump ED 101
Open Loop Circulation vf/vp
*
Pump ED 101
*
Pump ED 101
200 195
187
178
165
148
125
100
168 164
157 150
139
124
105
84
139 135
130 124
115
103
87
69
113 110 105
100 93
83
70
56
89 87 83
79 73
66
56
44
68 66 64 61 56
50 43
34
50 49 47 45 41 37
31 25
0
50
100
150
200
250
0 500 1000 1500 2000 2500
Head
in
feet
Gallons Per Minute
Pump Head vs System Head
60hz
55hz
50hz
45hz
40hz
35hz
30hz
System
Design Pt
Data Label values = feet
Cornell 5RB 1780 RPM 13.5" Trim
*
Pump ED 101
60% 72%
80%
84%
86%
86%
83%
74%
60% 72%
80% 84%
86%
86%
83%
74%
60% 72%
80% 84%
86%
86%
83%
74%
60% 72% 80%
84% 86%
86%
83%
74%
60% 72% 80%
84% 86%
86%
83%
74%
60% 72% 80% 84% 86%
86% 83%
74%
60% 72% 80% 84% 86% 86%
83% 74%
0
50
100
150
200
250
0 500 1000 1500 2000 2500
Head
in
feet
Gallons Per Minute
Pump Hydraulic Efficiency vs System Head
60hz
55hz
50hz
45hz
40hz
35hz
30hz
System
Design Pt
Cornell 5RB 1780 RPM 13.5" Trim
Data Label values = Pump Ef
*
Pump ED 101
42 51
59
67
73
76
76
77
32 40
45 52
56
59
59
59
24 30
34 39
42
44
44
44
18 22 25
28 31
32
32
32
12 15 17
20 22
23
23
23
8 10 12 13 14
15 15
15
5 6 7 8 9 10
10 10
0
50
100
150
200
250
0 500 1000 1500 2000 2500
Head
in
feet
Gallons Per Minute
Pump BHP vs System Head
60hz
55hz
50hz
45hz
40hz
35hz
30hz
System
Design Pt
Cornell 5RB 1780 RPM 13.5" Trim
Data Label values = BHP
*
Pump ED 101
1.16 0.94
0.82
0.74
0.67
0.60
0.53
0.47
0.98 0.79
0.69 0.62
0.56
0.50
0.44
0.40
0.81 0.66
0.57 0.51
0.46
0.42
0.36
0.33
0.65 0.53 0.46
0.42 0.38
0.34
0.30
0.27
0.52 0.42 0.36
0.33 0.30
0.27
0.23
0.21
0.40 0.32 0.28 0.25 0.23
0.20 0.18
0.16
0.29 0.24 0.20 0.18 0.17 0.15
0.13 0.12
0
50
100
150
200
250
0 500 1000 1500 2000 2500
Head
in
feet
Gallons Per Minute
Power / 1000 Gallons Pumped
60hz
55hz
50hz
45hz
40hz
35hz
30hz
System
Design Pt
Cornell 5RB 1780 RPM 13.5" Trim
Data Label values = kW / 1000 Gal
*
Pump ED 101
0.116 0.094
0.082
0.074
0.067
0.060
0.053
0.047
0.098 0.079
0.069 0.062
0.056
0.050
0.044
0.040
0.081 0.066
0.057 0.051
0.046
0.042
0.036
0.033
0.065 0.053 0.046
0.042 0.038
0.034
0.030
0.027
0.052 0.042 0.036
0.033 0.030
0.027
0.023
0.021
0.040 0.032 0.028 0.025 0.023
0.020 0.018
0.016
0.029 0.024 0.020 0.018 0.017 0.015
0.013 0.012
0
50
100
150
200
250
0 500 1000 1500 2000 2500
Head
in
feet
Gallons Per Minute
Cost / 1000 Gallons Pumped
60hz
55hz
50hz
45hz
40hz
35hz
30hz
System
Design Pt
Cornell 5RB 1780 RPM 13.5" Trim
Data Label values = $$ / 1000 Gal
*
VFD Control – Multiple Pumps
2 Pumps – 1 Drive
2 Pumps – 1 Drive & Contactors
2 Pumps – 2 Drives
Pump ED 101
*
Pump ED 101
*
Pump ED 101
25% 45%
55% 60%
67%
72%
78%
76%
25% 45%
55% 60%
67%
72%
78%
76%
25% 45%
55% 60%
67%
72%
78%
76%
25% 45%
55% 60%
67% 72%
78%
76%
0
50
100
150
200
250
300
0 50 100 150 200 250 300 350 400 450
Head
in
feet
Gallons Per Minute
60hz
55hz
50hz
45hz
System
Vertical Multistage (25HP)
Data Label values are
Hydraulic Efficiency
*
Pump ED 101
25% 45%
55% 60%
67%
72%
78%
76%
25% 45%
55% 60%
67%
72%
78%
76%
25% 45%
55% 60%
67%
72%
78%
76%
25% 45%
55% 60%
67% 72%
78%
76%
0
50
100
150
200
250
300
0 100 200 300 400 500 600 700 800 900
Head
in
feet
Gallons Per Minute
System
D60
D55
D50
D45
Vertical Multistage (25HP)
Data Label values are
Hydraulic Efficiency
*
Pump ED 101
Pump ED 101
Centrifugal Pump Training Series
Centrifugal Pump Selection
Joe Evans, Ph.D
http://www.PumpEd101.com
http://www.Pump-Zone.com
Pump ED 101