Siemens SITRANS L Operating Instructions Manual page 33

Flange bolting: recommended torque
Pressure class
ASME B16.5, Class 150
EN1092-1, PN16 /
JIS B 2220, 10K
Flange bolting instructions:
1. Use cross-pattern sequence as shown.
2. Check uniformity of the flange gap.
3. Apply adjustments by selective tightening if required.
4. Torque incrementally until desired value is reached.
5. Check/re-torque after 4 to 6 hours.
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH
Nominal pipe size
(NPS)
2"
3"
4"
6"
DN50/50A
DN80/80A
DN100/100A
DN150/150A
4.4 Installation instructions
Number of bolts
4
8
4
8
Installing/mounting
Recommended torque
(Nm)
30 – 50
50 – 70
40 – 60
70 – 90
30 – 50
60 – 80
33