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bind together.
•
At the end of the hold time, the pump
must be allowed to cool naturally or can
be purged with sterile air/inert gas.
ATTENTION
The pump must not be rotated during cooling.
•
Do not allow cool liquid to enter the lobe
pump before pump temperature has fallen
to 60°C (140°F) or lower.
If the pump is fitted with silicon carbide/silicon
carbide seals, flood it with liquid to lubricate the
seals before rotating it.
6 INSPECTION AND
REPAIR
HP & LH pumps need no adjustment during
normal operation. It is advisable though to check
oil levels and inspect pump head components
(especially seals and joints) periodically so that
they may be cleaned or replaced before they fail
in service.
All primary fluid contact components of the pump
can be inspected and serviced without removing
the pump rotor case from the bearing carrier and
without removing either the pump or drive unit
from the baseplate, as follows:
ATTENTION - For your safety:
Before commencing any repair or inspection,
isolate the power to the pump and drive motor,
depressurize, drain and isolate the pipework, seal
flush and temperature control jackets (if fitted).
6.1 END COVER
Removal
Before removing the end cover (122), ensure the
pump & drive are isolated; the pump is cool
enough to safely touch, drained of any fluids
(take special care with hazardous fluids) and
ensure that pump, seal flushing system and
jackets are isolated and depressurized.
If the end cover is fitted with a pressure relief
valve refer to (END COVER RELIEF VALVE)
Proceed as follows:
ATTENTION
The end cover is heavy; take care to support it
when removing the bolts (123).
•
Remove the bolts (123) and remove the
cover. If it is stuck tap carefully sideways
with a soft hammer, do not lever off.
•
DO NOT damage the face of the cover
nor the seal ring: place face upwards on a
clean surface.
Re-fitting:
•
Place the O-ring (120) in the end cover
groove, ensuring that it seats evenly.
(Figure 17)
Figure 17 – HP & LH end cover
6.2 ROTORS
Removal:
Disconnect the pump from the motor drive.
Remove the end cover (See 6.1 END COVER)
•
The rotors are secured by special slotted
screws (59) and sealed by O-rings (58).
•
Lock the pump rotors with a soft spacer
(Figure 18) - a plastic block (180) is
provided with the pump for this purpose.
23
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