Maintenance
AVOID INJURY. Establish safe handling procedures for cryopanels and louvers
that may hold toxic or radioactive gases. Contamination by some gases can
result in serious injury or death to personnel. See the Cryopump Handling and
Shipping procedure in the Maintenance section of this technical manual.
Procedures in this manual apply only to uncontaminated cryopumps.
AVOID INJURY. When handling pressurized gas lines and other pressurized
equipment, always wear eye protection. Never apply heat to a pressurized gas
line or other pressurized components.
AVOID INJURY. Use two wrenches when disconnecting a gas line coupling to
avoid loosening the cold head coupling. Gas pressure can project the coupling
with enough force to cause serious injury.
EXPLOSION HAZARD. AVOID INJURY. Disconnect the gas lines from the
cold head only when the cold head is stopped and warmed to room temperature.
Disconnecting the cold head while it is cold can create excessively high internal
pressure as the gas warms. Material failure and uncontrolled pressure release
can cause serious injury.
EXPLOSION HAZARD. AVOID INJURY. The compressor is charged with
helium gas. Except when disconnecting adsorber or gas lines, vent the
compressor to atmospheric pressure before disassembly. Uncontrolled pressure
release can cause serious injury.
EXPLOSION HAZARD. AVOID INJURY. Never use compressed gas from a
cylinder without a proper regulator. Overpressure can cause serious injury if the
system equipment ruptures.
AVOID INJURY FROM BURNS by allowing the compressor to cool for ½ hour
after shutdown before removing the cover for maintenance.
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