4 ;
5.2 EMERGENCY LEVELS
The whole Emergency Shut-Down System shall be structured on different hierarchical safety shut-down levels, listed here below in order of priority:
• Level 0: Abandon Platform Shut-Down (ASD) – Activated only by manual ASD call points on the Platform and in NA/Q-PIII Control Room; this will cause activation of ESD and closure of Well SSSV.
• Level 1: Emergency Shut-Down (ESD) – From confirmed fire or manual activation (locally or from the remote control centre); this will cause automatic shut-down, with SDVs closure and depressurisation. Fire condition shall be announced by an acoustic alarm. Confirmed gas detection (in open and closed area) will cause automatic shut-down.
• Level 2: Process Shut-Down (PSD) – From detection of abnormal conditions that have the potential for developing into an accidental situation, e.g. process upset in the Platform, for manual activation (locally or from remote control centre), this will stop the Platform production.