CR, CRI, CRN, CRE, CRIE, CRNE - Grundfos Canada

Selection and sizing
CR, CRI, CRN, CRE, CRIE, CRNE
How to read the curve charts
Number of stages.
First figure: number of
stages;
second figure: number of
reduced-diameter impellers.
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.
H
[m]
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
H
[ft]
1000
950
900
850
800
750
700
650
600
550
500
450
400
350
300
250
200
150
100
50
-11-2
-10
-10-2
-9
-9-2
-8
-8-2
-7
-7-2
-6
-6-2
-5
-5-2
-4
-4-2
-3
-3-2
-2
-2-1
-2-2
-1
-1-1
CR(E) 32
CRN(E) 3 2
2-pole, 60 Hz
0
0
0 20 40 60 80 100 120 140 160 180 200 Q [US GPM]
P2
0 5 10 15 20 25 30 35 40 45
P2
Q [m3/h ]
Eff
[kW ] [hp]
[%]
4
Eff
P2 1/1 80
2
3
P2 2/3
60
2
40 The NPSHR curve is an
1
1
20 average curve for all the
0 0
0 variants shown. When
0 20 40 60 80 100 120 140 160 180 200 Q [US GPM] sizing the pumps, add a
H NPSH
H safety margin of at
[m] [ft]
[ft]
30
30 least 2.0 feet.
8
20
20
4
10
NPSHR
10
0 0
0
H
[ft]
1000
950
900
850
800
750
700
500
450
400
350
300
250
200
150
Pump type, number
of poles and frequency.
QH curve for the individual
650
pump. The bold curves
600
indicate the recommended
550 performance range for
best efficiency.
The power curves indicate
100
pump input power per stage.
50
Curves are shown for
complete (1/1) and for
reduced-diameter (2/3)
impellers.
TM02 0039 1303
Fig. 27 How to read the curve charts
Guidelines to performance curves
The guidelines below apply to the curves shown on the
following pages:
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
= 1 mm 2 /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
104 140 176 212 248 284 320 356
40 60 80 100 120 140 160 180 t [°F]
40 60 80 100 120 140 160 180t [°C]
Fig. 28 Minimum flow rate
TM02 7538 3703
25