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Quantitative Risk Assessment (QRA)

QRA is a tool that consistently analyses the risks from venturesome activities in order to quantify the risks to personnel engaged on the power, so compare the anticipated risk levels against the QP risk criteria and assess their tolerability. Additionally, QRA is additionally used to estimate the risks to public.

Technical Challenge:

Risk assessment is an overall method of distinctive and analyzing risk, and evaluating however it would be changed to take care of applicable levels of safety and to satisfy the regulative, company norms / criteria.

It is vital to spot risks in industrial workplaces so as to shield the plant staff, the folks within the close space, the setting and therefore the plant assets. Demonstration of acceptable risk levels is usually a demand for any single or several facilities like chemical production and process facilities, high pipelines or storage and transportation sites for gas / oil.

Why QRA Study is needed?

The QRA provides valuable insights into the risk profile of the plant, distinctive and ranking the areas wherever failures might result harmful to the operators, members of the general public /community in proximity, the setting and therefore the quality itself. QRA provides a basis for higher cognitive process within the design and operation of the plant and should even be needed to indicate that assets are suited purpose of its meant operation.

What will QRA assist you to know?

The most obvious service of a QRA are the 2 ingredients of risk: consequence and prob­ability. For each accident situation known, there'll be a selected hazard zone (as outlined by the hazard endpoints) and a corresponding chance of incidence. As separate items, the consequence modeling results are typically a lot of helpful than the chance values. A QRA generates an oversized quantity of consequence info, permitting in depth comparison between the consequences of hole size(s), climate, and plenty of different variables. Though seldom used expressly, every individual accident outcome has an associated chance of incidence.

The most common and often most helpful things provided by a QRA are individual risk contours.

When QRA ought to be done?

QRA techniques is administered to spot potential hazards to an asset together with plant, method and personnel; & the proper time to travel for QRA when;

  • Estimating risk levels and assessing their tolerability
  • Identifying main contributors to risk
  • Demonstrating acceptability of risks to regulators and the workforce
  • Evaluating risk reduction measures to determine effectiveness in reducing risks
  • Identifying safety and environmental critical equipment and procedures
  • Providing a basis for current higher cognitive process on safety and operational problems
  • Comparing different design options

Approach / Methodology

A Typical QRA process includes:

Identification of Hazards and Major Loss of Containment & Calculation of physical effects of failure case scenarios Which includes Estimation of Jet Fire, Pool Fire heat radiation distances, Flammable gas dispersion distances, BLEVE and overpressure explosion distances
QRA Methodology

INPUTS REQUIRED (not an exhaustive list)

  • Latest Piping and Instrumentation Diagrams (P&IDs)
  • Operating Philosophy and Process Conditions/ Operating Parameters
  • Population Details (Location and Number)
  • Site Meteorology & etc.
  • Latest Scaled Layout/ Plot set up

The study will comprise of a number of distinct but interrelated tasks as follows:

  • Site visits; ( optional- subject to project case)
  • Data collection and review of relevant documents for the project;
  • Identification of potential hazardous events;
  • Development of the QRA methodology and assumptions report;
  • Risk evaluation and integration;
  • Consequence assessment including development of incident scenarios using event tree analysis (ETA);
  • Failure frequency analysis;
  • ALARP demonstration;
  • Provision of Risk Reduction Measures (RRMs); and
  • Preparation of QRA report for project scope.
QRA Risk levels


  • QRA Assumption Register/Methodology Report
  • QRA Study Report

iFluids Engineering expert team having sound experience in completing Qualitative Risk Assessments (QRAs), which is a structured approach to identifying and understanding the risk associated with hazardous activities such as the operation of the plant / operation facility…

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