Safe job procedures developed for energy isolation with blinds and valves must meet or exceed the Alberta Occupational Health and Safety Code, April 2004, Part 15 and the following core procedures.
Piping containing harmful substances under pressure must have:
- an isolation system of blanking or blinding, or
- a double block and bleed isolation system providing two blocking seals with an operable bleed-off between the two seals.
Where piping is blanked or blinded it must be clearly marked to indicate that a blank or blind is installed.
Piping containing a harmful substance must be isolated by blanking or double blocking and bleeding before and during the repair, modification or replacement of the piping.
If two valves with a bleed-off valve between them are used to isolate piping, the bleed-off valve must be locked in the “OPEN” position and ensure that the valves in the flow lines are functional and locked in the “CLOSED” position.
If it is not reasonably practicable to provide blanking, blinding or double block and bleed isolation, an alternate means of isolation that provides adequate protection to workers, certified as appropriate and safe by a professional engineer, must be implemented.
Work processes and procedures must be developed and implemented to be followed when work is to be performed on any temporary or permanent mechanical piping system, any equipment or system operated from a potentially energized piping or mechanical source or where a hazard may exist from accidental energizing of a piping or mechanical system, or equipment in the vicinity.
To be continued…
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