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Device isolation physical method

Device isolation physical method

Jan 16, 2020

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