Since 1987 – Safety Consultancy

QRA/PHA

Quantitative Risk Assessment (or Process Hazard Analysis or Site Safety Review or Safety Report) is not rocket science but to be carried out successfully you need professional experience and technical know-how from different fields. To assure our customers of a good and consistent quality of services, Eidos groom Analysts and develop in house methods for risk assessment to reach the desired goals.

The QRA of a site consists in a summary of the various Plants’ QRA integrated with the site specific studies highlighted in the Site Top-events identification page.

The site level QRA is also the best place to develop the following ancillary studies:

  • Domino effects: Eidos developed a complete set of methods to evaluate domino effects due to heat radiation, explosion bursts and missiles production by blasts
  • Building and control room vulnerability (on customer request)
  • “Outside the fence” land-use compatibility
  • Exposure risks for personnel (on customer request)
  • Plant layout based risks
  • SIL evaluation (on customer request)
  • Plant risks in case of unavailability of ancillary systems (Electrical Power, Fuel Gas, Steam, Nitrogen, Cooling Water, Instrument Air, Control signals, etc.). This study is developed for complete or partial unavailability (p.e. a single switchboard, etc.)

Eidos prepares QRA studies employing different references/standards to fulfill customers’ requirements (AIChE Guidelines, API, 2012/18/UE directive, UK COMAH Regulations, customers own best practice, etc.)

QRA/PHA of a site is usually prepared on the following occasions:

  • At the end of basic design or FEED of a new plant or site if this involves site-wide concerns (please refer to Engineering Assistance)
  • Pre-startup safety review: in case of a new industrial site or after significant modifications to an existing one
  • At least every five years (this requirement is coded by 2012/18/UE direcive and UK COMAH regulations and became a common practice)
  • Before decommissioning of a site (required only by EC Directive). This is the saddest case

Eidos develops QRA studies since 1987 using the following “classic approach”: