Bypass; Flange Forces And Torques - Grundfos CR Serie Instrucciones De Instalación Y Operación

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
Elbows should be at least 12" from the bypass opening to prevent
erosion.
Suction
Recommended bypass arrangement
Fig. 7
Bypass
opening
Suction
Optional bypass arrangement
Fig. 8
Bypass
opening
Suction
Optional bypass arrangement for CR, CRN 32, 45, 64
Fig. 9
and CR 90, 120 and 150 only
14
for minimum flow rates.
Bypass line
Discharge
Bypass line
Discharge
Bypass line
Discharge

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.
Y-direction: Direction of chamber stack
Z-direction: 90 ° from inlet/outlet
X-direction: Inlet/outlet
Fig. 10 Flange forces and torques
CR, CRI,
Flange
Y-direction
CRN
[lb]
1 1/4" 1s to 5 171
10, 15 and
2" 303
20
2 1/2" 32 382
3" 45 461
4" 64 and 90 607
120 and
5", 6" 607
150
CR, CRI,
Flange
Y-direction
CRN
[ft-lb]
1 1/4" 1s to 5 605
10, 15 and
2" 738
20
2 1/2" 32 793
3" 45 848
4" 64 and 90 922
120 and
5", 6" 922
150
Force [F]
Z-direction X-direction
[lb] [lb]
263 175
371 337
466 422
562 506
753 674
753 674
Torque [M]
Z-direction X-direction
[ft-lb] [ft-lb]
715 900
848 1,033
904 1,106
959 1,180
1,069 1,291
1,069 1,291