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CONFIDENTIAL
AIXTRON
- Dokumentation
Safety
System Manual
Lockout/tagout procedure
CRIUS II
2
2.7
Lockout/tagout procedure
Maintenance and service work can be extremely dangerous if the serviced
components are not shut down and secured properly. Contact with live parts,
the release of stored energy, or the unexpected start-up of the serviced com-
ponent can cause serious injury to personnel and also damage the equipment.
These hazards can be avoided through the strict use of the lockout/tagout pro-
cedure. In short, this means that you have to shut down, de-energize, lock out,
and tag out the component before servicing it. In the following, this procedure
will be described in detail.
2.7.1
Applying lockout/tagout devices
Before beginning any maintenance or service work, the following steps must
be performed in the given order:
Shutting down
1
Prepare the component for shutdown (if necessary). Also make sure
that the shutdown of the component will not affect running processes.
2
Shut down the component
Locking out
3
Isolate the component from all energy sources. In small components,
this can be done by disconnecting the energy source (e.g. unplugging
the line cord). In other cases, this is done by switching relevant energy-
isolation devices to the safe or OFF position. Typical examples of
energy-isolation devices are:
•
Power breakers, switches, fuses (electric power)
•
Shut-off valves (process gases, vent gas, pneumatic supply, water)
4
Lock the energy-isolation device in the safe position. For this purpose,
apply a padlock which can only be opened with a key. Typical examples
are shown below. The lockout devices make sure that the component
will not be re-energized by mistake.
Fig. 2-12
Energy isolation device locked in the safe position (example)
Tagging out
5
Post a prominent tag onto each lockout device. This tag is a warning to
others that the component must not be put back into operation until the
lock and the tag have been removed by the authorized person. Tags
