Grundfos MAGNA3 D Installation And Operating Instructions Manual page 196

Flange forces and moments
Maximum permissible forces and moments from the pipe connections acting on the pump flanges or threaded connections are indicated
in fig. 37.
Forces and moments from the pipe connections acting on the pump flanges or threaded connections
Fig. 1
Diameter DN Fy
40 500
50 675
65 850
80 1025
100 1350
The above values apply to cast-iron versions. For stainless-steel versions, the values can be multiplied by two according to the ISO 5199
standard.
Tightening torques for bolts
We recommend the following tightening torques for bolts used in
flanged connections:
Bolt dimension
M12
M16
196
Force
[N]
ΣFb
Fz Fx
625 550 975
825 750 1300
1050 925 1650
1250 1125 1975
1675 1500 2625
Torque
20 ft lb
(27 Nm)
48 ft lb
(66 Nm)
Moment
[Nm]
My Mz Mx
450 525 650
500 575 700
550 600 750
575 650 800
625 725 875
ΣMb
950
1025
1100
1175
1300