Tightening torque for piping flange of pump. (In the cace of steel flange with rubber gasket.)
Recomended bolt size and tightening torque for piping flange are as follows.
MDF-L250 : Bolt size is M12 and tightening torque is 42 N·m.
MDF-L401, 422, 423, 425, 505, 507, 657, 6510 and 6515 : Bolt size is M16 and tightening torque is 78.4
N·m.
Load of piping and momentum of piping for MDF-L.
The permissible stress and moment applicable to pump connection arrangement are as shown below.
The piping should be designed and worked so that stress and moment, higher than those values indicated in the table,
should not be applied to the pump.
Z
X
Y
X
Z
Y
3. Piping
- 22 -
Table 9 : Piping loadings
Forces of discharge piping
Forces of suction piping
Direction of load
Mx
My
Mz
Direction of load
Fx
Fy
Fz
kN
0.89
0.58
0.71
kN
1.33
0.89
1.07
Dia. of pipe
25, 40, 50
65, 80
Load
kN·m
0.46
0.35
0.23
kN·m
0.95
0.72
0.47
Dia. of pipe
25, 40, 50
65, 80
Load
Direction of load
Fx
Fy: compression
Fy: tension
Fz
kN
0.71
0.89
0.44
0.58
kN
1.07
1.33
0.67
0.89
Dia. of pipe
25, 40, 50
65
Load
Mx
My
Mz
Direction of load
kN·m
0.35
0.46
0.23
kN·m
0.72
0.95
0.47
Dia. of pipe
25, 40, 50
65
Load
Moments of discharge piping
Moments of suction piping
