Operation
Waukesha Cherry-Burrell
Page 36
95-03057
11/2012
Shutdown Procedure
CAUTION:
The steam or
refrigeration supply valves must
be shut off BEFORE stopping
product flow. Failure to do this
could result in product burn-on or
freezing in heat exchanger
cylinders.
These instructions are general and should be used only as a
guide. It may be necessary to modify them to conform to actual
in-plant requirements. Changes should be documented by plant
personnel. Emergency Shut-Down procedures should be
documented by plant personnel after assessing system-wide
requirements.
Where product characteristics permit, shut off the mutator shaft,
the media flow and the pump. Otherwise, it may be necessary to
heat or cool the product to ambient temperature to avoid burn-on
or freeze-up.
In instances where product goes to a filler, it may be necessary to
provide a surge tank or a recirculation line.
With continuous operations, a steam line connected to the
product line can enable steam to soften and remove product in
the tube at shut down.
The final option is to have hot water chase product from the tube
at the end of the run.
Preventing Tube Scoring
Scoring of the heat exchanger tube can have many causes. The
most common are temperature extremes, material problems in
the heat exchanger tube, or units operated without product or CIP
flow.
The following suggestions will help prevent tube scoring:
•
Do not pump cold product into a unit that is still hot from
cleaning (this can cause temporary bowing of the tube). Wait
until the tube has cooled before running cold product.
•
Do not leave sterilizing water or solution in the tube after
sterilization is complete. Drain the tube completely of
sterilizing water or solution. Fill the tube with product prior to
starting.
•
Make sure that condensate is drained completely in BWS
cylinders. The steam trap must be large enough to carry
away all condensate.
