190.210-IOM (FEB 20)
Page 19
LAZERWELD II PLATE HEAT EXCHANGER
MAINTENANCE
7. Place the other bolts in position.
• Inspect the washers.
• When fully tightened, ensure the bolts are all equally
tensioned.
PRESSURE TEST 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 minutes for each media.
Always check that the local regulations of this procedure
are fulfiled.
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.
STORAGE OF 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 properly 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.
Outdoor storage
If the LZWII is stored outdoors, follow all the precautions
mentioned in
Indoor storage
. Protection against environ-
mental conditions is also very important.
Visually check the stored heat exchanger every third
month. The check includes:
• Greasing of the tightening bolts
• Metal port covers
• Protection of the plate pack and gaskets
Long time storage
If the LZWII is stored for a long period of time, follow the
same advice as in the previous sections. For long term
storage, the LZWII must be filled with inert gas, such as
N2, in order to keep the gaskets in good condition. This
prevents moisture and oxygen from reaching the gaskets.
