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Product Manual - APPS 160
General
Strict compliance with proper safety and handling practices
is necessary when using an APPS 160 unit We recommend
that all our customers re-emphasize safety and safe handling
practices to all their employees and customers While every
possible safety feature has been designed into the units and
safe operations are anticipated, it is essential that every user
of the APPS 160 unit carefully read all warnings listed in this
safety section and contained in the manual itself Periodic
review of this safety summary is recommended
Warning! INSTALLATION: The APPS 160
should be installed by a trained,
knowledgable technician. The
cryogenic piping connected
to the inlet and outlet must
be constructed of materials
suitable for cryogenic service
and properly protected from
possible over-pressure.
The electrical connections
to the control box should
be completed by a trained
technician per the wiring
schematic. The APPS 160
should be located on suitable,
level surface and be properly
fastened to prevent movement.
Warning! ASPHYZIATION HAZARD:
The venting nitrogen gas may
displace the available oxygen
in the area to the point where
the atmosphere is deficient in
oxygen. The cold nitrogen vent
gas can collect in low areas,
increasing the potential risk.
When the APPS 160 is installed
indoors or in any area with poor
ventilation, the installation of
an oxygen monitor should be
considered.
The normal oxygen content of air is approximately 21%
Depletion of oxygen content in air, either by combustion
or by displacement with inert gas, is a potential hazard and
users should exercise suitable precautions
One aspect of this possible hazard is the response of humans
when exposed to an atmosphere containing only 8 to 12%
oxygen In this environment, unconsciousness can be
immediate with virtually no warning
When the oxygen content of air is reduced to about 15
to 16%, the flame of ordinary combustible materials,
including those commonly used as fuel for heat or light,
may be extinguished Somewhat below this concentration,
an individual breathing the air is mentally incapable of
diagnosing the situation because the onset of symptoms
such as sleepiness, fatigue, lassitude, loss of coordination,
errors in judgment and confusion can be masked by a state of
“euphoria,” leaving the victim with a false sense of security
and well being
Human exposure to atmosphere containing 12% or less
oxygen leads to rapid unconsciousness Unconsciousness can
occur so rapidly that the user is rendered essentially helpless
This can occur if the condition is reached by an immediate
change of environment, or through the gradual depletion of
oxygen
Most individuals working in or around oxygen deficient
atmospheres rely on the “buddy system” for protection -
obviously the “buddy” is equally susceptible to asphyxiation
if he or she enters the area to assist the unconscious partner
unless equipped with a portable air supply Best protection
is obtainable by equipping all individuals with a portable
supply of respirable air Life lines are acceptable only if the
area is essentially free of obstructions and individuals can
assist one another without constraint
If an oxygen deficient atmosphere is suspected or known to
exist:
1
Use the “buddy system ” Use more than one “buddy” if
necessary to move a fellow worker in an emergency
2
Both the worker and “buddy” should be equipped with
self-contained or airline breathing equipment
Warning! EXTREME TEMPERATURES:
Surfaces in contact with the
cryogenic liquid nitrogen or the
vent gas will become extremely
cold. These surfaces should not
be touched.
Safety
