Siemens SITRANS LR250 Kompaktbetriebsanleitung Seite 17

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.
Recommendations for flange bolting:
● Check bolts periodically, re-torque as required.
● Use new lens, O-ring and spring washers after removal from installation.
For instructions on replacing the lens, see Part replacement (Page 36).
For more details, see dimension drawings in full operating instructions.
SITRANS LR250 (FOUNDATION FIELDBUS)
A5E33472700-AA, 08/2014
Nominal pipe size (NPS)
2"
3"
4"
6"
DN50/50A
DN80/80A
DN100/100A
DN150/150A
Number of bolts
4
8
4
8
Recommended torque (Nm)
30 – 50
50 – 70
40 – 60
70 – 90
30 – 50
60 – 80
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