Performance curves

Performance curves
H
[m]
240
H
[ft]
Low-NPSH pumps
CR 10, CRI 10, CRN 10
-16
CR 10
CRI 10
CRN 10
-14
2-pole, 60 Hz
-17
800
750
220
700
200
650
180
600
H
[ft]
800
750
700
650
600
-12
550
550
160
500
140
500
-10
450
450
-9
120
400
400
-8
350
350
100
-7
300
80
300
-6
250
250
-5
40
200
200
-4
150
150
-3
100
20
0
100
50
50
0
0
0
0
5
1
10
2
15
3
20
4
25
5
6
30
35
40
7
8
9
45
10
50
11
55
12
60
13
14
Q [US GPM]
15
Q [m³/h]
P2
P2
[kW] [hp]
Eff
[%]
0.8
0.4
0.2
0.0
P2
Eff
0.6
40
0.2
20
0.0
0
5
10
15
20
25
30
35
40
45
50
55
60
Q [US GPM]
H NPSH
[m]
[ft]
NPSH
[ft]
15
NPSHR
4
10
0
60
0.4
0
2
80
15
10
Low NPSHR
5
0
5
0
0
5
10
15
20
25
30
35
40
45
50
55
60
Q [US GPM]
TM02 8380 2004 CR 10
60
33
CrCriCrn.book Page 23 Monday, November 15, 2004 11:32 AM
Selection and sizing
Vertical multistage centrifugal pumps
How to read the curve charts
300
H
[ft]
-10
CR(E) 32
CRN(E) 32
900
-10-2
2-pole, 60 Hz
850
-9
850
800
-9-2
800
750
-8
750
1000
-11-2
950
280
260
240
Number of stages.
First figure: number of
stages;
second figure: number of
reduced-diameter impellers.
220
-8-2
700
200
180
160
140
120
550
-6-2
500
450
-5-2
400
400
-4
350
350
-4-2
100
300
80
The power curves indicate
pump input power per stage.
Curves are shown for complete
(1/1) and for reduced-diameter
(2/3) impellers.
60
40
300
-3
250
-3-2 (E)
250
200
-2 (E)
-2-1
-2-2
200
-1 (E)
-1-1 (E)
100
150
100
20
0
50
150
50
0
P2
P2
[kW] [hp]
0
0
20
0
5
40
60
10
80
15
100
20
120
25
140
30
160
35
180
200
40
45
Q [US GPM]
Q [m³/h]
P2 1/1
Eff
4
2
P2 2/3
3
2
1
0
80
60
0
20
40
60
80
100
120
140
160
180
200
Q [US GPM]
H
[ft]
30
30
20
0
Eff
[%]
20
0
H NPSH
[m] [ft]
4
The eff curve shows the efficiency of
the pump. The eff curve is an average
curve of all the pump types shown in
the chart.
The efficiency of pumps with
reduced-diameter impellers is
approx. 2% lower than the eff curve
shown in the chart.
40
1
0
8
QH curve for the individual pump.
The bold curves indicate the recommended performance range for best
efficiency.
500
-5
450
900
600
-6
550
950
650
-7-2
600
1000
700
-7
650
Pump type, number of poles
and frequency.
H
[ft]
20
10
The NPSHR curve is an average
curve for all the variants shown.
When sizing the pumps, add a
safety margin of at least 2.0 feet.
10
NPSHR
0
0
0
20
40
60
80
100
120
140
160
180
200
Q [US GPM]
TM02 0039 1303
H
[m]
Fig. 27 How to read the curve charts
Guidelines to performance curves
1. The motors used for the measurements are standard
motors (ODP, TEFC or MLE).
2. Measurements have been made with airless water at
a temperature of 68°F.
3. The curves apply to a kinematic viscosity of
υ = 1 mm2/s (1 cSt).
4. Due to the risk of overheating, the pumps should
not be used at a flow below the minimum flow rate.
5. The QH curves apply to actual speed with the motor
types mentioned at 60 Hz.
The curve below shows the minimum flow rate as a
percentage of the nominal flow rate in relation to the
liquid temperature. The dotted line shows a CR pump
fitted with an air-cooled top assembly.
Qmin
[%]
30
20
10
0
104
320 180
356
40 140
60 176
80 212 248
120 284
140 160
t [°F]
TM02 7538 3703
The guidelines below apply to the curves shown on the
following pages:
Fig. 28 Minimum flow rate
23
CrCriCrn.book Page 13 Monday, November 15, 2004 11:32 AM
Construction
Vertical multistage centrifugal pumps
CR(E) 1s, 1, 3, 5, 10, 15 and 20
TM02 1198 0601 - GR7377 - GR7379
TM02 1808 2001 - GR7373 - GR7375
CRI(E), CRN(E) 1s, 1, 3, 5, 10, 15 and 20
Sectional drawing
Sectional drawing
1
1
3
3
10
2
6
7
10
4
5
6
7
5
9
TM02 1194 1403
9
8
8
TM02 1195 1403
4
11
Materials: CRI(E), CRN(E)
Materials: CR(E)
Pos.
Designation
Materials
AISI/ASTM
Materials
AISI/ASTM
1
Pump head
Cast iron
A 48-30 B
1
Pump head
Cast iron 3)
A 48-30 B
2
Pump head cover
Stainless steel
CF 8M 4)
3
Shaft
Stainless steel
AISI 316 5)
AISI 329 6)
AISI 431 7)
CF 8M4)
3
Shaft
Stainless steel
AISI 316 1)
AISI 431 2)
4
Impeller
Stainless steel
AISI 304
5
Chamber
Stainless steel
AISI 304
6
Outer sleeve
Stainless steel
AISI 304
Pos. Designation
8
Base
Stainless steel
9
Neck ring
PTFE
10
Shaft seal
Cartridge type
11
Base plate
Cast iron 3)
Silicon carbide
7
O-ring for outer
sleeve
EPDM or FKM
8
Base
Cast iron
9
Neck ring
PTFE
Bearing rings
10
Shaft seal
Cartridge type
Rubber parts
Bearing rings
Silicon carbide
Rubber parts
EPDM or FKM
A 48-30 B
A 48-30 B
EPDM or FKM
CRI(E)
4
Impeller
Stainless steel
AISI 304
5
Chamber
Stainless steel
AISI 304
2) CR(E) 10, 15, 20
6
Outer sleeve
Stainless steel
AISI 304
3)
7
O-ring for outer sleeve
EPDM or FKM
4
Impeller
Stainless steel
AISI 316
5
Chamber
Stainless steel
AISI 316
6
Outer sleeve
Stainless steel
AISI 316
7
O-ring for outer sleeve
EPDM or FKM
1)
CR(E) 1s, 1, 3, 5
Stainless steel available on request.
4) CF 8M is cast equivalent of AISI 316 stainless steel.
5)
CRI(E)/CRN(E) 1s, 1, 3, 5
6) CRN(E) 10, 15, 20
7)
CRI(E) 10, 15, 20
CRN(E)
13