32
User Manual v2.0
MAG
4.5.3 Tightening torque
• Flanged sensors
Standard bolts must be lubricated well and tightened evenly around the gasket. If the bolts are overtightened,
leakage or damage to the flowmeter or piping may occur.
Carefully follow the instructions given in the
diagrams. Check the correct centering of the
sensor before you tighten the flanges and proceed
following the steps described here.
• Step 1. ≈ 50% of the maximum tightening torque
• Step 2. ≈ 80% of the maximum tightening torque
• Step 3. 100% of the maximum tightening torque
given in the diagram.
All the values are theoretical and have been
calculated for optimal conditions and with the
use of carbon steel flanges.
Fig. 46 | Flange tightening
DN
PN
BOLTS
Maximum tightening torque [Nm]
Sensor MAG
PTFE
Ebonite
15
40
4xM12
10
6
20
40
4xM12
16
10
25
40
4xM16
20
12
32
40
4xM16
35
20
40
40
4xM16
45
25
50
40
4xM16
55
30
65
40
8xM16
38
25
80
40
8xM16
45
25
100
16
8xM16
45
25
125
16
8xM16
55
40
150
16
8xM20
70
50
200
10
8xM20
85
70
200
16
12xM20
70
45
250
10
12xM20
80
65
250
16
12xM24
115
80
300
10
12xM20
90
75
300
16
12xM24
145
105
350
10
16xM20
100
75
400
10
16xM24
140
105
450
10
20xM24
-
95
500
10
20xM24
-
110
600
10
20xM27
-
140
700
10
20xM27
-
160
800
10
24xM30
-
220
900
10
28xM30
-
205
1000
10
28xM35
-
260
