English (US)
14
8.6 Bypass
Install a bypass in the discharge pipe if there is any risk that the
pump may operate against a closed valve in the discharge line.
Flow through the pump is required to ensure that adequate
cooling and lubrication of the pump is maintained.
See 7.3 Minimum inlet pressures for minimum flow rates.
Elbows should be at least 12" from the bypass opening to prevent
erosion.
Fig. 7 Recommended bypass arrangement
Fig. 8 Optional bypass arrangement
Fig. 9 Optional bypass arrangement for CR, CRN 32, 45, 64
and CR 90, 120 and 150 only
8.7 Flange forces and torques
If not all loads reach the maximum permissible value stated in the
tables after fig. 10, one of these values may exceed the normal
limit. Contact Grundfos for further information.
Fig. 10 Flange forces and torques
TM04 3926 3613TM04 3909 3613TM04 3924 0409
Discharge
Suction
Bypass line
B
y
p
a
s
s
o
p
e
n
i
n
g
Discharge
Bypass line
Bypass
opening
Suction
Bypass line
Bypass
opening
Suction
Discharge
TM04 0346 1613
Flange
CR, CRI,
CRN
Force [F]
Y-direction
[lb]
Z-direction
[lb]
X-direction
[lb]
1 1/4" 1s to 5 171 263 175
2"
10, 15 and
20
303 371 337
2 1/2" 32 382 466 422
3" 45 461 562 506
4" 64 and 90 607 753 674
5", 6"
120 and
150
607 753 674
Flange
CR, CRI,
CRN
Torque [M]
Y-direction
[ft-lb]
Z-direction
[ft-lb]
X-direction
[ft-lb]
1 1/4" 1s to 5 605 715 900
2"
10, 15 and
20
738 848 1,033
2 1/2" 32 793 904 1,106
3" 45 848 959 1,180
4" 64 and 90 922 1,069 1,291
5", 6"
120 and
150
922 1,069 1,291
Y-direction: Direction of chamber stack
Z-direction: 90 ° from inlet/outlet
X-direction: Inlet/outlet
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