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4.3.2
Torque values
Torque calculations
CAUTION
Overtightened bolts
Leakage/damage to flowmeter or piping may arise if bolts are overtightened.
All values are theoretical and are calculated on the assumption that:
• All bolts are new and material selection is according to EN 1515-1 table 2.
• Gasket material not exceeding 75 shore A is used between the flowmeter and mating flanges.
• All bolts are galvanized and adequately lubricated.
• Flanges are made of carbon steel.
• Flowmeter and mating flanges are correctly aligned.
Torque values
Note
Conversion to F/Lbs
To convert the torque values from Nm to F/Lbs multiply by 0.74.
Table 4-1
Minimum and maximum torques for EN 1092-1 PN 6 to PN 16 in Nm
Nominal
size
EN 1092-1
PN 6
PN 10
PN 16
Liner
PFA, PTFE,
Ebonite
Soft rubber,
EPDM, Linatex
PFA, PTFE,
Ebonite
Soft rubber,
EPDM, Linatex
PFA, PTFE,
Ebonite
Soft rubber,
EPDM, Linatex
mm
inch Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
15
½
-
-
-
-
-
-
-
-
-
-
-
-
25
1
-
-
-
-
-
-
-
-
-
-
-
-
32
1¼
-
-
-
-
-
-
-
-
-
-
-
-
40
1½
-
-
-
-
-
-
-
-
-
-
-
-
50
2
-
-
-
-
-
-
-
-
-
-
-
-
65
2½
3.9
4
3.2
4
-
-
-
-
8.5
9
6.9
7
80
3
6.9
7
5.7
6
-
-
-
-
10.8
11
8.8
9
100
4
10.3
11
8.7
9
-
-
-
-
13.8
14
11.6
12
125
5
6.4
7
5.5
6
-
-
-
-
19.2
20
16.5
17
150
6
8.1
9
7.2
8
-
-
-
-
29.8
31
26.1
27
Installing/Mounting
4.3 Mounting
SITRANS FM MAG 3100
Operating Instructions, 12/2021, A5E03005599-AE
33