Bypass; Flange Forces And Torques - Grundfos CR 1s Instrucciones De Instalación Y Operación

8.8 Bypass

Install a bypass in the outlet pipe if there is any risk that the pump
may operate against a closed valve in the outlet line. Flow
through the pump is required to ensure that adequate cooling and
lubrication of the pump is maintained. See
pressures for minimum flow rates.
Elbows should be at least 12" from the bypass opening to prevent
erosion.
Inlet
Fig. 7 Recommended bypass arrangement
Bypass
opening
Inlet
Fig. 8 Optional bypass arrangement
Bypass
opening
Inlet
Fig. 9 Optional bypass arrangement for CR, CRN 32, 45 and
64
16
7.3 Minimum inlet
Bypass line
Outlet
Bypass line
Outlet
Bypass line
Outlet

8.9 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
2" 10, 15, 20 303
2 1/2" 32 382
3" 45 461
4" 64 607
CR, CRI,
Flange
Y-direction
CRN
[ft-lb]
1 1/4" 1s to 5 605
2" 10, 15, 20 738
2 1/2" 32 793
3" 45 848
4" 64 922
Force [F]
Z-direction X-direction
[lb] [lb]
263 175
371 337
466 422
562 506
753 674
Torque [M]
Z-direction X-direction
[ft-lb] [ft-lb]
715 900
848 1033
904 1106
959 1180
1069 1291