Device isolation physical method
For pressure systems, production facilities and access to restricted Spaces
1. Disconnect by physical means and close the disconnect point (the safest way to isolate)
2. Install the blind plate with handle or pipe
The installed blind plate must meet the specifications. Applicable to the following situations: maintenance work lasts more than one working day; Work on the compressor; Repair pumps and use them unattended when exposed to air (except for condensate, water, air or nitrogen systems at pressures below 150psi)
3. Double isolation and evacuation
The process control valve cannot be mechanically locked in the closed position as a basic isolation
Main valves shall be identified by a unique code name
Vent and discharge valves open to prevent pressure buildup
4. Close and lock valve
Mechanical Lockout tagout, marked by unique Numbers on drawings, Padlock, chain,car seal, all major pneumatic
Hydraulic and electronic control valves (by instrument personnel)
Main valves shall be identified by a unique code name
All isolation valves must be closed and mechanically locked
Vent and discharge valves open to prevent pressure buildup
Electrical isolation
Ensure that all power sources are isolated
Let go of stored or residual power
Use insulated MATS, shields, gloves and tools
Use properly designed and rated test equipment
Qualified personnel
Electric shock or burn/spark
