190.210-IOM (FEB 20)
Page 18
LAZERWELD II PLATE HEAT EXCHANGER
MAINTENANCE
5. If the cassettes are correctly assembled, the edges
form a honeycomb pattern, see picture below.
6. Press the plate assembly together. Tightening is done
in two steps, see substeps below. Be careful to ensure
that the frame plate and the pressure plate are always
in parallel.
a. Tighten the two diagonal pairs of bolts alternately
until the plate package measures 1.10A.
Be careful to ensure that the frame plate and pres-
sure plate are always in parallel. Skewing of the
pressure plate during opening must not exceed 10
mm (2 turns per bolt) across the width and 25 mm (5
turns per bolt) vertically.
b. After that, bolts are tightened alternately and diago-
nally. Check the dimension A during tightening at the
positions of the bolts that are being used.
NOTICE
For the final tightening, alternate between bolts to
reach dimension A.
Max tightening torque
When a pneumatic tightening device is used see Table 3
for maximum torque. Measure dimension A during tight-
ening.
Table 3: Torque measurement
Bolt size
Bolt with
bearing box
Bolt with wash-
ers
N·m
kpm
N·m
kpm
M24
450
45
M30
585
58
900
90
M39
1300
130
2000
200
M48
2100
210
3300
330
For manual tightening, the tightening torque has to be
estimated.
If dimension A cannot be reached:
• Check the number of cassettes and the dimension A.
• Check that all the nuts and bearing boxes are running
freely. If not, clean and lubricate, or replace.
• Leave the LZWII between 24 to 48 hours, the longer
the better, for gaskets to relax.
1.10A
1.10A
