What is Lock Out?
Lock out is the process of preventing the flow of energy from a power source to a piece of equipment & keeping it from operating. Lock out is accomplished by installing a lock out device at the power source that equipment powered by that source can’t be operated. A lock out device is a lock, block or chain that keeps a switch, valve or lever in the off position. This is a special lock using for lock out only.
What is Tag Out?
Tag out is practiced by placing a tag on the power/energy source. The tag acts as a warning not restore energy. It is not a physical restriction tags must clearly state DO NOT OPERATE or the like & must be applied by hand.
What is Blinding?
The insert of a blind, spade or spectacle plate, the location of which is specified on an official blind list. Valve closed, isolating the system, put the blind
What is Isolation?
- To remove energy either mechanical or electrical e.g. blinding or disconnection
- To separate energy either electrical or mechanical
- Positive isolation: means all energy sources to be identified all energy sources must be isolated and residual energy must be eliminated
Kinds of Blinds:
- Slip blind
- Ring blind
- Spectacle blind,
- Flange blind
Safe Isolation:
Stoppage, draining down and blanking the systems during a shutdown assured by:
It is a decisive for the safety of maintenance staff that services are stopped, drained down, blanked etc. and remain in a safe status for the duration of the work
Knowledge Point:
- Radiation energy, stored energy may be contained.
- Cable steel/ car steel: flexible wire locks Red for closed and Green for open.
- Pro lock. Universal system color red and green shall be used with conjunction with tag.
- Residual stored energy: stored energy may be contained. Available some energy to harm.
- Group lock out box: used to electrical breakers where can hold only one lock and others locks shall be in group lockout box which is available beside the panel.
- Above 650 v Isolate and De-isolates done by SAEP (senior authorized electrical person).
- 250 to 650 v done by IDA (Isolation and De-isolation authority).
- ICP: Isolation control point.
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