CHART CryoDoser FleX, Product Manual

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14 Daily Operating Procedures Product Manual - CryoDoser FleX
™
LN
2
Dosing System
Bulk Tank (House Fed) System
Note: LN
2
is -320°F (-196°C). Any water and/
or moisture can cause ice which will affect
the performance of the CryoDoser FleX
system. Providing a positive pressure
of GN
2
(also known as purging) to the
CryoDoser FleX unit before introducing
LN
2
into the body will eliminate many
performance interruptions.
Image 23
Purging with Gaseous Nitrogen
Purging is the process of introducing nitrogen gas into the
CryoDoser FleX body to minimize and/or eliminate ice
that may have formed within the system. Ice may form
whenever there is an introduction of a liquid substance into
the CryoDoser FleX body. This may be because of product
splashing, steam from CIP, or just an intake of moisture from
the environment.
Freeze-ups may result in delays - some extreme if the ice
within the body has occurred deep inside the vessel.
With the CryoDoser FleX system, Chart has taken steps to
ensure freeze-ups are minimized. Each system is provided
with integral purging capabilities including an option to
provide heated gas. Heating the gas accelerates the removal
of ice so as to bring the down time to a minimum.
For additional information about purging please refer to the
Controller Quick Start Guide.
Caution! When purging the CryoDoser
FleX unit, it will vent heavily and
there will be a steady stream
of “fog” from the vent. This
“fog” will be cold to the touch if
the internal temperature of the
CryoDoser FleX unit is still at or
near LN
2
temperatures (-320°F;
-196°C). Once the CryoDoser
FleX unit is at or near ambient
temperature, the “fog” will warm
up.
System Start Up
There are two primary methods for delivering liquid nitrogen
to the CryoDoser FleX system; phase separator through a
Y-pattern valve and Chart Dura-Cyl
®
Liquid Cylinder or
similar dewar through a Chart flexible “123” hose.
If the CryoDoser FleX system is being fed liquid nitrogen
via a phase separator, ensure the phase separator has been