Venting operations were taking place on the HP stack when liquid was identify being released. This was due to a build up of liquids over time and annunciation of a high level alarm on the vent stack being missed by operations.
It was also identified that the auto drain facility on the system was not configured to manage the HP/LP interface.
Routine inspections of standing alarms.
Comprehensive handover of Critical information.
Operational Plant inspections to reviewed.
- Shift handover process shall include new standing alarms for previous shift.
- These alarms to continue to be on handover until positive action / commentary allows removal.
- Modify NROs [non-routine operations] to include checking the level in the HP vent.
Assessment of the number / origin of standing alarms at each asset.
Standing alarms that are active due to the set point to be reviewed within the alarm nationalization process.
Standing alarms associated with operating mode / maintenance outages to be addressed within the proposed review / rewrite of the inhibit and override procedure.
Identify the standing alarms associated with redundant equipment and identify and provide list to the integrity manager to feed into the decommissioning process.
HP Vent stack