Overview


Current process engineering projects are increasing large (both in terms of capacity and foot print) and this inadvertently increases the risk and consequence of accidents. Accidents results in many consequences such as:

· fatalities;

· injuries;

· pollution;

· loss of revenue; and

· loss of reputation etc.


Quantitative Risk Assessment (QRA) is an industry recognized technique used to better understand the risks and the consequences of accidents for an asset.


IRC has undertaken many QRA studies across various process facilities (from offshore platforms to LNG receiving terminals) and assist clients to better understand the accident risks and consequences associated to their facility.


QRA Method


QRA uses outcomes of other risk assessment techniques such as HAZIDs and HAZOPs are used to identify Major Accident Events (MAEs) which are evaluated in the QRA.


The likelihood of a MAE occurring is determined in the frequency analysis phase. The likelihood of a MEA occurring is influenced by the initialling event frequency (ie leakage frequency) and probability of occurrence (ie early ignition or delayed ignition).


Fire and Explosion Analysis (FEA) or Consequence Analysis (CA) is used to determine the consequence of a MAE occurring. The impact is affected by factors such as facility’s layout, orientation to wind and the distribution of personnel etc.


QRA Application


QRA has an umber of applications which can be used through the development and operation of a facility.


Some QRA applications are as follows:

· Fatality Risk Assessment;

· Comprehensive QRA (Risk to life, safety functions, environment etc);

· FEA/ CA; and

· Evacuation, Escape and Rescue Analysis (EERA) etc.