How should standby equipment affect asset criticality?
Consider standby capacity only after confirming that it is available, independent enough and capable of delivering the required function.
What to consider
A backup can reduce the consequence of an individual equipment failure, but the benefit depends on operating mode, transfer arrangements, common dependencies, maintenance practices and actual spare capacity. Separate the consequence of one item failing from the consequence of losing the overall system function.
Practical steps
- Confirm the required duty and whether the standby item can carry it under expected conditions.
- Review shared power, controls, cooling, suction or other dependencies.
- Check how availability and transfer readiness are established under site procedures.
- Document assumptions and revisit the assessment when configuration or operating conditions change.
A practical example
A plant has two pumps on the drawing, but the second unit has not been tested at the flow now required. The workshop records the standby unit as an assumption to verify instead of automatically reducing the system's consequence score. Operations checks capacity, changeover arrangements and common dependencies. If standby capability is insufficient, the team revises the rating and assigns an owner for the resulting action.
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