The explosion at BP's Texas city (March, 2005), macondo deepwater horizon blowout (April 2010), an Olefins Plant reboiler rupture and fire (June, 2013) and the explosion of a Refinery in Torrance (Feb, 2015) are all widely known major incidents that have resulted in major loss of lives, damage to the assets and the environment. These looses worth millions of dollars not counting the loss of lives shows that process safety barriers was compromised. How then can we be more certain that these incidents does not occur again in our plants? What indicators can we look out for? Are our risk assessment for process safety accidents properly assessed with adequate barriers defined to prevent the occureance of major incidents? This paper focuses on the technological risk assessment (scenario based assessment; a Total E&P major risk assessment methodology) carried out on OML 99 for the management of major risk activities. To study, manage operational activities, hazards to people, environment and assets were identified and assessed in a systematic methodology and associated risks evaluated. The objective of the process was to proffer risk reduction measures and ensure that sufficient barriers exist to prevent major risk scenarios. The outcome of the technological risk process was the major risk register containing the top ten scenarios (Major Risks) showing scenarios, barriers/controls in preventing and protecting the occurrence of these major accidents with an action plan containing a list of approved risk reduction measures at the end of the ALARP demonstration. As examples, the paper communicates the barrier management strategies between the major risk register, the site emergency response plan, safety critical barriers and management inorder for Field Operations management to ensure that the asset operational Chain of Command identifies and manages the major risks of their installations in order to prevent the occurrence of major incidents.

The outcome of the Technological Risk Assessment is the major risk register that contains all the major incident scenarios including the top ten scenarios and their corresponding barriers towards prevention, control & mitigation of potential consequences. The expected result of an effective Barrier Risk Management is to reduce and or minimize the possibility of a major process safety incident happening due to weaknesses developed in these barriers and ensuring that all the necessary mitigation and mechanisms are robust enough and in place should an incident happen. Are our Barrier risk assessment for process safety accidents properly assessed with adequate barriers defined to prevent the occurrence of major incidents? This means that, the assurance of Process Safety is defined on the basics that all our Safety Critical Barriers (SCBs) are clearly understood, by knowing what our critical controls are, assessing and monitoring their health status in our day-to-day operations towards ensuring that they are functionally available on demand to prevent, mitigate and control process safety incidents. This Paper in detail, will describe the operationalization of the Bow Tie Barrier Risk management, beginning with the Identification of Safety Critical Barriers for operating plants in an integrated approach, defining potential threats from major accident scenarios, its effects and their barriers in one holistic view with the BowTie, act as a line of sight for individual barrier performance management, action plans and improvement. Converting the BowTie from a static to a dynamic barrier management tool by identifying any missing or possible degraded barriers and manage corrective actions implementation, plug in other operational elements such as incidents, audits, inspections, change management and safety and inspections information to create relationship between the barriers and any operational disturbances.