How do you verify the effectiveness of a pneumatic lockout tagout before starting work?

1 Identify the hazards

Before applying LOTO, you need to identify the potential hazards of the pneumatic system, such as high pressure, stored energy, moving parts, noise, or toxic substances. You also need to know the location and function of all the valves, switches, regulators, and gauges that control the air or gas flow. You should consult the manufacturer's instructions, the equipment manual, or the system diagram for this information.

2 Notify the affected workers

You should inform all the workers who may be affected by the LOTO procedure, such as operators, supervisors, or other maintenance personnel. You should explain the reason, scope, and duration of the LOTO, and warn them not to attempt to operate or tamper with the locked or tagged devices. You should also use signs, labels, or barricades to indicate the LOTO area.

3 Isolate the energy source

You should isolate the energy source of the pneumatic system by closing and locking the main supply valve, or by disconnecting and locking the air or gas line. You should use a lock that is compatible with the device, and that can only be opened by the authorized worker who applied it. You should also use a tag that clearly identifies the worker, the date, and the purpose of the LOTO.

4 Release the stored energy

You should release any stored energy in the pneumatic system by bleeding, venting, or draining the air or gas from the pipes, tanks, cylinders, or other components. You should use the appropriate tools and protective equipment, and follow the manufacturer's recommendations. You should also check for any residual pressure by opening and closing the downstream valves or devices.

5 Test the lockout

You should test the effectiveness of the LOTO by trying to operate or activate the pneumatic system, using the normal controls or methods. You should ensure that no air or gas flows, and that no parts move or rotate. You should also check for any signs of leakage, vibration, or noise. If the system is not completely de-energized, you should repeat the previous steps until it is.

6 Start the work

Once you have verified the effectiveness of the LOTO, you can start the maintenance or repair work on the pneumatic system. You should follow the work instructions, and use the proper tools and safety precautions. You should also keep the lock and tag in place until the work is finished, and only remove them when you are ready to restore the energy source and resume the normal operation.

7 Here’s what else to consider

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