Risk Assessment

Quantitative Risk Assessment (QRA)

QRA involves calculation of the frequency and consequence of a range of hazardous events and numeric combination of these to estimate the risk in a numerical format to allow direct comparison of results, including a measurement of risk to nearby neighbors and society as a whole. QRA is generally considered to be most useful for quantifying off-site risk

Qualitative Risk Assessment

The most common form of preliminary or qualitative risk assessment is a “risk matrix”, which assesses individual incidents in terms of categories, e.g. low, medium and high, according to their expected consequence and likelihood. These methods can provide a relatively rapid understanding of the risk profile of the facility and can be based on judgment or be refined using more detailed information. However, the understanding gained will be relatively coarse, and the methods have limitations. For example, it is not easy to incorporate the effects of risk reduction measures within the risk matrix, and neither method is easy to use to assess cumulative hazards, in particular at facilities where a large number of hazards exist. To assess such issues, methods that are more detailed are likely to be required.

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Escape, Evacuation and Rescue Analysis (EERA):

In any facility, Prevention of Fire & Explosion and Emergency Response (PFEER) Regulations require that duty holders/facility personnel ensure adequate arrangements for escape, evacuation, rescue and recovery of persons involved in an incident.

The purposes of the escape, evacuation and rescue (EER) goals are:

  1. To demonstrate all reasonably practicable measures have been taken to ensure the safe and effective evacuation, escape and rescue of personnel from the installation,
  2. To demonstrate the adequacy of the evacuation, escape and rescue provisions in response to accident conditions,
  3. To provide guidance for management of emergencies.

The EER analysis will use detailed results from explosion, fire and smoke modeling for topside releases to assess the ability of personnel to reach a safe location in the event of an incident. The modeling allows the effectiveness of the escape routes to be determined and identifies circumstances where personnel cannot reach a place of safety.

Dropped Object Risk Assessment (DORA)

Dropped Object Risk Assessment (DORA) is used to calculate the frequency of dropped objects and their consequences on the impacted objects. Falling objects and swinging load impacts due to mechanical handling failures can occur in industrial facilities both onshore and offshore. The predominant use for this analysis is to support the design of offshore floating drilling and production units. This technique is quite specialized and iFluids through detailed analysis will provide measures to reduce this risk to a tolerable and as low as reasonably possible (ALARP) level. It can be part of a Quantitative Risk Assessment (QRA).

The results are used to specify requirements for engineered and operational safeguards to mitigate the risks. These can include structural protection, increased strength of components, restrictions on lifting pathways and incorporation of redundant mechanical handling systems.