4.4. Alternative Isolation Methods
Where it may not be reasonably practicable to provide blanking/blinding or double block and
bleed isolations, alternative isolation methods may be utilized.
Alternative methods of isolation must:
Adequately protect workers, and
Must be certified as appropriate and deemed safe by a professional engineer, and
Documented and retained on file.
Workers must be informed of approved alternative isolation methods and be instructed in
applicable work procedures required as part of the approval.
Each business unit (BU) will maintain a listing of approved alternative methods of isolation not
specifically referenced within this document.
The BU listing must contain:
Specific requirements or limitations related to the approval.
Timeframes associated with the approval.
Approver name and title.
The approved isolation must be specifically referenced on the applicable isolation
certificates when used.
Note: In British Columbia, an alternative method of control or isolation used for confined
space entry must be acceptable to and approved by WorkSafe BC.
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