How can operators switch HPUs in COND III?

To switch High-Pressure Units (HPUs) in Condition III, using the process of contacting the Central Control Station (CCS) for online activation is the appropriate method. This approach ensures that the switch is executed safely and efficiently, leveraging the monitoring and operational expertise available at the CCS. They have the capability to verify system integrity and manage the transition between HPUs in a controlled manner, minimizing the risk of operational disruptions or hazards.

Manually resetting the control panel could pose risks if the operator is unaware of existing faults or conditions that might affect the HPU operation. This method lacks the comprehensive oversight provided by the CCS.

Using backup batteries to power the unit might not guarantee the necessary operational parameters for the HPU during the switch and could potentially lead to a failure if the battery does not have sufficient charge or capacity.

Waiting for an automatic switch would depend on the system's design and may not be applicable in all scenarios; it assumes that the system is functioning optimally and that all necessary checks have been performed, which can lead to delays in critical operations.

Therefore, contacting the CCS is the most reliable and safest method for operators to switch HPUs in Condition III, ensuring an aligned and safe operational process.