KROHNE OPTIFLUX 7300 EN - Manual (Page 18)

3
INSTALLATION
18
OPTIFLUX 7300
www.krohne.com 01/2011 - 4001163301 - MA OPTIFLUX 7300 R01 en
3.5.2 Torques and pressures flanged versions
Tighten the bolts in fixed order, see picture:
• Step 1: by hand
• Step 2: approx. 25% of max. torque
• Step 3: approx. 50% of max. torque
• Step 4: approx. 80% of max. torque
• Step 5: 100% of max. torque given in table
EN 1092-1
WARNING!
Use stainless steel A2 / 6.9 class bolts.
INFORMATION!
Diameters DN80 and DN100 have 8 holes per flange, please continue in the same way to tighten
the other bolts.
CAUTION!
With the instrument, 4 PTFE sealing rings are included (2 to be used with installation,
2 as spare).
No other gaskets are required.
Nominal size
DN [mm]
Pressure
rating
Bolts Max. torque
[Nm]
25 PN 40 4 × M 12 73.5
40 PN 40 4 × M 16 178
50 PN 40 4 × M 16 178
80 PN 40 8 × M 16 178
100 PN 16 8 × M 16 178