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Take care not to scratch or damage pump parts.
One part of the seal faces remains in the rotor
when it is removed. Be extremely careful not to
damage this seal face.
DO NOT use steel abrasive wool or brushes on
fluid wetted surfaces as particles may become
embedded in the surface and cause corrosion.
Use suitable cleaning agents in accordance with
their
manufacturer's
temperatures, dilutions, skin contact precautions
and other safety information.
Thoroughly clean all fluid contact surfaces and
rinse as required.
As a minimum it will be necessary to remove the
end cover and rotors. Re-assemble the pump in
accordance with this manual.
5.2 STERILIZING IN PLACE (SIP)
It is possible to pass steam through the complete
assembled
system
to
surfaces without dismantling the pump.
To achieve 100% sterility, it is important to steam
through for a period long enough for the coldest
part of the system to reach the correct
temperature and hold for the time period required
to kill off the organisms.
Procedure for Sterilizing In Place (SIP)
If using chemical sanitizers, follow the guidelines
as for CIP above. If using steam, the pump
specification must be chosen at the time of
selection noting:
•
EPDM elastomers offer best resistance to
repeated steam contact but will need to
be changed periodically.
•
PTFE (Teflon) is least suitable for steam
contact - PTFE end cover joints may need
to be replaced every time the pump is
sterilized.
•
For more information contact JEC.
The pump should be mounted with the port axis
vertical to avoid collecting liquid pools.
•
Thoroughly clean the pump and process
lines prior to sterilization.
ATTENTION
instructions
regarding
sterilize
the
internal
•
Pass clean, wet steam through the system
until all component temperatures have
stabilized. Steam must be free of scale,
rust and particles - a filter may be
necessary. Typically steam will be at
121°C (250°F) and 1 bar (15 psi). Soak
time, to bring the pump up to temperature
is typically 20 minutes but this should be
established, e.g. using thermocouples, as
the required soak time will vary with
individual installations.
ATTENTION
Do not rotate the lobe pump during this heating
phase.
ATTENTION
Do not loosen or remove any pump components
or pipe connections during steam sterilization as
escaping steam may cause serious injury.
•
Continue to pass wet steam through the
lobe pump and process lines during the
hold time. Hold time will be determined by
the user to achieve desired level sterility.
Typically this will be between 20 and 60
minutes.
•
The lobe pump should not be rotated
during this hold time unless absolutely
essential to achieve sterility, due to
increased risk of pump seizure. All pump
components
will
desired
temperature
conduction without rotating the pump.
ATTENTION
•
If essential, the lobe pump can be rotated
by hand during the hold time - beware of
danger of hot surfaces – or at a maximum
of 50 rpm but only if the pump is fitted
with either:
•
Single carbon/silicon carbide seals - or -
Flushed or double seals provided a liquid
flush, i.e. Condensate is connected and
operating at a pressure above the steam
pressure within the pump during SIP.
ATTENTION
If the lobe pump is fitted with single silicon
carbide/silicon carbide seals it must not be
rotated during hold time as the seal faces can
normally
reach
the
by
thermal
22
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