SPX Waukesha Cherry-Burrell Votator II, Operation And Maintenance Manual

Page: 37 / 84

Waukesha Cherry-Burrell Operation
October 2005 95-03057 Page 37
Shutdown Procedure
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.
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.
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.