Maintenance English
Plate Heat Exchanger 15
eng
Max tightening torque
For manual tightening, the tightening torque has to
be estimated.
If dimension A cannot be reached
• Check the number of plates and the dimension A.
• Check that all the nuts and bearing boxes are
running freely. If not, clean and lubricate, or
replace.
The dimension A can be exceeded in exceptional
cases. The following plate package lengths could
then be accepted:
Place the other bolts in position.
• Inspect the washers.
• When fully tightened, the bolts should
all be equally tensioned.
• The difference between the plate pack-
age lengths (the dimension A) meas-
ured at adjacent bolts should not
exceed:
– 2 mm when A <1000 mm
– 4 mm when A >1000 mm.
• The plate package length at all bolts
must not differ more than 1 %.
• If the unit does not seal fully, it can be
tightened to give dimension A – 1 %.
The maximum tightening torque must
not, however, be exceeded.
If the plates are correctly assembled, the
edges form a “honeycomb” pattern, see
picture below.
Bolt
size
Bolt with bearing
box
Bolt with washers
N·mkpmN·mkpm
M24 450 45
M30 900 90
M39 1300 130 2000 200
M48 2100 210 3300 330
Plate package length/plate Plate package
length (dimension A)
>4 mm A + 1 %
3–4 mm A + 1,5 %
<3 mm A + 2 %
Note!
When a pneumatic tightening device is used,
see table below for maximum torque. Meas-
ure dimension A during tightening.
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