Grundfos CR-H, Installation And Operating Instructions Manual

Page: 7 / 64

7
5. Applications
Grundfos multistage, horizontal, end-suction centrifugal pumps,
types CR-H and CRN-H, are designed for a wide range of
applications.
CR-H and CRN-H
CR-H and CRN-H pumps are suitable for liquid transfer,
circulation and pressure boosting of cold or hot clean liquids.
CRN-H
Use CRN-H pumps in systems where all parts in contact with the
liquid are made of high-grade stainless steel.
5.1 Pumped liquids
The CR-H and CRN-H are capable of pumping thin, clean, non-
flammable liquids, not containing solid particles or fibers. The
liquid must not attack the pump materials chemically.
When pumping liquids with a density and/or viscosity higher than
that of water, use motors with correspondingly higher outputs,
if required.
6. Operating conditions
6.1 Ambient temperature and altitude
If the ambient temperature exceeds the maximum temperature
limits of the pump or the pump is installed at an altitude
exceeding the altitude values in the chart below, the motor must
not be fully loaded due to the risk of overheating.
Overheating may result from excessive ambient temperatures or
the low density and consequently low cooling effect of the air at
high altitudes. In such cases, it may be necessary to use a motor
with a higher rated output (P
2
).
Fig. 1 Relationship between motor output (P
2
) and
ambient temperature/altitude
Legend
Example: From fig. 1 it appears that P
2
must be reduced to 88 %
when a pump with a NEMA Premium efficiency, ML motor is
installed 15584 feet above sea level. At an ambient temperature
of 167 °F, P
2
of a standard efficiency motor must be reduced to
74 % of rated output.
6.2 Liquid temperature
The tables on pages 19 and 20 state the relationship between
liquid temperature range and maximum permissible operating
pressure.
6.3 Maximum permissible operating pressure and
liquid temperature for the shaft seal
CR 1s to CR 20 H
Fig. 2 Operating range of standard shaft seals for CR 1s to
CR 20 H
CR 32 to CR 90 H
Fig. 3 Operating range of standard shaft seals for CR 32 to
CR 90 H
TM
03
4
272
20
06
Pos. Description
1 NEMA Standard efficiency motors
2 NEMA Premium efficiency motors
Note
The maximum permissible operating pressure
and liquid temperature ranges apply to the pump
only.
60 80 100 120 140 160 180
T [°F]
50
60
70
80
90
100
[%]
P2
1
2
3280 7382 11483 15584 ft
Note
The diagrams below apply to clean water and
water containing anti-freeze liquid.
TM
02 753
7 140
9
T
M
04
4
4
73
14
09
Shaft
seal
Description
Max.
temperature
range
[°F]
HQQE
O-ring (cartridge) (balanced seal),
SiC/SiC, EPDM
–22 °F to +248 °F
HQQV
O-ring (cartridge) (balanced seal),
SiC/SiC, FKM
–4 °F to +194 °F
HUBE
O-ring (cartridge) (balanced seal),
TC/carbon, EPDM
+32 °F to +248 °F
HUBV
O-ring (cartridge) (balanced seal),
TC/carbon, FKM
+32 °F to +194 °F
KUBE
Bellows, metal (cartridge),
TC/carbon, EPDM
+32 °F to +248 °F
KUBV
Bellows, metal (cartridge),
TC/carbon, FKM
+32 °F to +194 °F
KUHE
Bellows, metal (cartridge),
TC/carbon with embedded TC,
EPDM
+32 °F to +194 °F
KUHV
Bellows, metal (cartridge),
TC/carbon with embedded TC,
FKM
+32 °F to +194 °F
KUUE
Bellows, metal (cartridge),
TC/TC, EPDM
–22 °F to +194 °F
KUUV
Bellows, metal (cartridge),
TC/TC, FKM
–4 °F to +194 °F
TC = tungsten carbide.
-40 0 40 80 120 160 200 240 t [°F]
0
100
200
300
400
[psi]
p
-40 -20 0 20 40 60 80 100 t [°C]
0
5
10
15
20
25
[bar]
p
HQQE
HQQV
HQQE
H
QQE
-40 0 40 80 120 160 200 240 t [°F]
0
100
200
300
400
500
[psi]
p
-40 -20 0 20 40 60 80 100 t [°C]
0
5
10
15
20
25
30
[bar]
p
KUBE
HQQE / HQQV HQQE
K
UUE
K
UUE
K
UUV
KUBE / KUBV
KUUE / KUUV
KUHE / KUHV