Insert
the gasket carefully between the flanges.
The
gasket has to be centralized in the flange.
Ensure
that the gasket is installed in a dry state.
It
is important that the gasket is not pinched or
otherwise damaged when bringing the flanges
together.
Lubrication
of
bolts
Apply
lubricant to the bolt and the nut threads as
well as to the face of the nut to reduce
friction when tightening
Pay attention that the lubricant
does not contaminate the gasket or the flange
surfaces.
The recommended service
temperature of the lubricant has to be within
the process service
temperature
limits.
Bolt tightening
Make at least 4 stages to the required torque as
follows:
finger
tighten
bolts
use
30% of the required
torque
use
60% of the required
torque
use
the full torque
Close
the torquing with one final pass in a clockwise
sequence.
Retightening
If
retightening is considered necesary, this should
only be done at ambient temperatures before or
during the first start-up.
Never
retighten compressed fibre gaskets at higher
operating tempera- tures and longer operating
times.
Re-use of gaskets
For
safety reasons never re-use a gasket.
The
cost of a gasket is minimal
compared with the costs which will come into
being of a down time of the plant.
>>The
End
