11.1 The purpose of <br>the change any chemicals, piping, equipment, components, etc., may produce unanticipated hazards and impact. In order to effectively control the risk and prevent the occurrence of hazards, before the change should be thoroughly assessed through a sign-off, execution improved; for after the change by the personnel impact of potential hazards should be good communication, and make the necessary ESH training, to reduce the risk of change.
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