Storage (Several Years) - GEA Grasso M-Series Operating Manual

Transport, Storage
Warning!
Regular ventilation of the screw com-
pressor package packaging (if
present) must be ensured in order to
prevent condensation on the surfaces
of the machine.
Long-term storage
With a standstill of the compressor of more than 16
weeks prior to start-up, there is a danger that the
shaft seal may stick on the shaft and therefore be
damaged on start-up. Because of this, removal and
cleaning of the shaft seal is mandatory in order to
ensure that it functions correctly.
1. Use two pressure screws to remove the cover of
the shaft seal, including the stationary gasket
inserted in it.
2. Removal of the seal package arranged on the
shaft with the associated slide ring by hand or, if
tightly seated, extraction by means of an appli-
ance. If the seating is loose, the seal package
may adhere to the stationary seal and will be
pulled out when removing the cover.
3. Clean the shaft seat with a lint-free cloth. Grease
it lightly and push the sealing package back onto
the shaft again.
4. After pushing onto the shaft, the seal package
must be manually compressed against the spring
pressure which acts on it. At the same time, it
must be checked whether the gasket springs out
again.
5. Then re-fit the cover of the shaft seal.
Warning!
Danger of cuts and crushing injuries.
6. If storage is longer than 26 weeks, all O-rings
must be renewed.
5.5

Storage (several years)

Hint!
The instructions in the "Transport,
storage" chapter must be heeded.
The following storage conditions must be maintained
when storing screw compressor packages that are
equipped with a control.
1. Storage temperature > 10°C
24
2. Air humidity < 50%
If the screw compressor package is intended to be
stored, the following preparatory measures must be
carried out ex-works (especially protection against
internal and external corrosion):
• All process connections on the screw compres-
sor package are sealed tight.
• The screw compressor package is charged with
dry gas to 1 bar.
• A suction pressure gauge has been installed.
• The facing sides of the mounted coupling hubs
have been greased. (Does not apply to sliding
bearing compressor drive motors)
Hint!
In case of the use of high-voltage
motors: the operating manual of the
manufacturer is to be followed, espe-
cially regarding any anti-condensation
heater required.
• Free-standing motor and main flow shafts have
been conserved.
• The space on the screw compressor for the shaft
seal has been greased.
• The connections on the oil cooler water side
have been sealed.
The following maintenance work must be carried out
at the storage location during storage:
1. Visual inspection of the general condition of the
screw compressor package.
2. Cyclical rotation of the screw compressor shaft
(about 10 revolutions per month and the com-
pressor drive motor (see operating manual).
Hint!
Does not apply to sliding bearing com-
pressor drive motors.
3. Check the transport fill pressure with a pressure
gauge at the connection of item 405 (see P+I
flow chart). If this value < 1 bar, replenish dried
gas via the valve of item 85 (see P+I flow chat).
All valves are already opened at the factory for a
common pressure range.
GEA Refrigeration Germany GmbH | P_261511_1 | Generated 01.04.2015
Operating Manual | GEA Grasso M-Series
Screw Compressor Packages