190.210-IOM (SEP 21)
Page 20
LazerWeld II Plate Heat Exchanger
Maintenance
Maximum tightening torque
When using a pneumatic tightening device, see
for
maximum torque. Measure dimension A during tightening.
Table 2: Torque measurement
Bolt
size
Approx.
rod dia.
Bolt with
bearing box
Bolt with
washers
in.
N·m
ft-lb
N·m
ft-lb
M24
0.95
-
-
450
332
M30
1.18
585
431
900
664
M39
1.54
1300
959
2000
1475
M48
1.89
2100
1549
3300
2434
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 h to 48 h, the longer the
better, for gaskets to relax.
Place the other bolts in position.
• Inspect the washers.
• When fully tightened, ensure the bolts are all equally
tensioned.
Figure 46: Tensioning the bolts
Pressure testing after maintenance
Before start-up of production, whenever cassettes or gas-
kets have been removed, inserted or exchanged, perform
a pressure test to confirm the internal and external sealing
function of the LZWII. During this test, one media side at a
time must be tested with the other side open to the ambi-
ent pressure.
CAUTION
Perform the pressure testing at a pressure equal to
the operating pressure of the actual unit, but never
above the design pressure as stated on the name-
plate.
The required test time is 10 min for each media. Always
check that the local regulations of this procedure are
fulfilled.
Note:
LZWII units for refrigeration applications and units with me-
dia not mixable with water must be dried after hydrostatic
pressure testing. If refrigerants are in the welded channels,
they must be tested with inert gas, such as N2.
Consult the local office/representative of the supplier for
advice on the pressure testing procedure.
Storing the LZWII
Frick delivers the LZWII ready to be put into service upon
arrival if nothing else has been agreed. However, keep the
heat exchanger in the packing box until installation.
Regarding storage for longer periods of time, one month
or more, it is necessary to make certain precautions to
avoid unnecessary damage to the LZWII.
NOTICE
Frick and its representatives reserve the right to in-
spect the storage space and/or equipment whenever
necessary until the date of expiry of the warranty
period stipulated in the contract. Notification has to
be given 10 days before the date of inspection.
If there is any uncertainty about the storage of the PHE,
consult your Frick Representative.
Storage in packing box
If the storage environment is known in advance, inform
Frick when ordering the heat exchanger to ensure that it is
correctly prepared for storage before packing.
Indoor storage
Ensure the following when storing indoors:
•
Store inside a room with the temperature between 60°F
and 70°F (15°C and 20°C) and humidity around 70%. For
outdoor storage see
Outdoor storage.
• To prevent damage to the gaskets, ensure there is no
ozone-producing equipment in the room such as elec-
tric motors or welding equipment.
• To prevent damage to the gaskets, do not store organic
solvents or acids in the room and avoid direct sunlight,
intensive heat radiation or ultraviolet radiation.
• Cover the tightening bolts well with light grease
coating.
