Instruction Manual
K SERIES Cryostorage System
IM: CryoCeK
Revision: 02
Approved by: CB
Page
22
of
87
5.3 LIQUID NITROGEN SUPPLY CONNECTION
IMPORTANT
The following safety precautions apply to the Worthington Industries K SERIES
Cryostorage System:
The liquid nitrogen source must have a shut-off valve, and may be any portable liquid
cylinder or a bulk supply.
Never install the supply system pressure relief device onto a liquid service
line.
When installing piping or fill hose assemblies, make sure a suitable safety relief valve is
installed in each section of plumbing between shut-off valves.
Trapped liquefied gas will expand greatly as it warms and may burst hoses
or piping causing damage or personal injury.
A relief valve is installed in the refrigerator plumbing to protect the line between the
customer supplied shut-off valve and the refrigerator solenoid valve
.
Inlet pressure should not exceed 1.5 bar/152 kPa!
Higher liquid nitrogen supply pressure at the inlet to the refrigerator opens
the relief valve on the refrigerator.
Once this pressure relief device has opened and cooled to liquid nitrogen temperature,
it will not reseat until it has warmed to near ambient temperature.
THIS COULD PERMIT THE ENTIRE CONTENTS OF THE LIQUID NITROGEN
SUPPLY SYSTEM TO BE DISCHARGED RAPIDLY INTO THE IMMEDIATE AREA OF
THE REFRIGERATOR.
This could result in damage to equipment and/or sufficient depletion of
oxygen in the atmosphere to cause dizziness, unconsciousness, or death.
The liquid nitrogen supply pressure at the inlet to the refrigerator should be in the range
of 0.7 bar/69 kPa to 1.4 bar/138 kPa for optimum performance.
The Worthington Industries K SERIES Cryostorage System includes a strainer.
The liquid fill hose from a low pressure source of liquid nitrogen must be connected to
the inlet through this fitting.
Ensure the strainer’s arrow is oriented with the flow of the liquid.
