5.1.7Process Safety Reporting

A Loss of Primary Containment (LOPC) is defined as an unplanned or uncontrolled release of any material from primary containment, including non-toxic and non-flammable materials (e.g. steam, hot condensate, nitrogen, compressed CO2 or compressed air).

A Process Safety Event (PSE) is defined as an LOPC from a process that meets the Tier 1, Tier 2 or Tier 3 definitions within API RP 754.

Loss of Primary Containment (LOPC) events are reported in the Company’s Single Reporting System as highlighted in Section 5.1.5. All LOPC’s are analysed to identify those considered to be PSE’s as per API RP 754. Process Safety KPIs used by the Company include the number of Tier 1 and the number of Tier 2 PSE’s.


The data for Process Safety Events (PSE’s) reported in 2016 have been revised to include six additional Tier 2 PSE’s which were previously classified as Tier 3 events (Total of 20 Tier 2). As reported in section 2.6.1, this is an additional outcome of the activity of the review of Tier 3 events performed at the beginning of 2017.