-1- SAFETY DEVICES
COMUN0001_EN-04 5/9
9 LOCK-OUT AND TAG-OUT PROCEDURE
Purpose
This procedure establishes the minimum requirements for the lock-out and tag-out of
power supply devices. It will be used to make sure that the machine or equipment is
disconnected from any power source that is potentially dangerous and that it is locked
and tagged before any personnel carries out any type of maintenance work or repair.
Responsibility:
Personnel responsible for work to be performed in dangerous areas must be instructed
as to the meaning of safety through the lock-out/tag-out procedure.
Preparation for Lock-out/Tag-out
All affected operators must be notified that the lock-out/tag-out procedure will be
performed.
Lock-out/Tag-out Sequence
Identify all devices and power sources that must be disconnected (switches, valves and
others).
- Electrical Cabinet. Cut the power using the input disconnecting switch and
remove the fuses (this blocks the air and water system).
- Air. Empty the cooling system (only if needed).
- Water (only with cooling system). Interruption of water intake if needed.
Add sign on machine prohibiting reconnection.
After ensuring that no one is exposed and to check that the power sources
disconnection was made correctly, press the activation buttons that control the
operation of the isolated section to make sure that the disconnection was efficient.
After performing the above operations, the machine will be in lock-out/tag-out and the
work may be performed without risk of an unexpected start-up.
If the process involves more than one person
In the steps shown in the above sections, if there is more than one person involved,
each person involved will lock-out and tag-out the power-cutting devices.
No one may remove it, except the person adding the lock-out and tag-out. The
equipment will not be connected while there is a lock-out and/or tag-out.
REPAIR AND MAINTENANCE OPERATIONS MUST BE PERFORMED
WHILE THE MACHINE IS STOPPED, ONCE ALL EXTERNAL POWER
SOURCES ARE DISCONNECTED AND AFTER DISCHARGING THE
RESIDUAL ENERGY FROM ACTUATORS.
REPLACE ACTIVATION BUTTONS TO THE OFF POSITION AFTER
THIS CHECK.
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