Single valve isolations may only be used in the following circumstances unless an
POSITIVE ISOLATION
Rev Date: March 2015
Page 6 of 8
This document is uncontrolled when printed.
Canada
o
Pig sending and receiving during routine operations
When a single valve isolation is used, the following conditions must be satisfied:
o
The isolation is not left unattended
o
The isolation is not for confined space
o
The isolation is not for hot work
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