Since 1987 – Safety Consultancy


HazOp (HAZard and OPerability) is the leading method to identify site’s “top-events” related to the processes involved. HazOp is the perfect tool to understand what can go wrong in a site due to deviations from the design and operational intent.

HazOp is a time-consuming activity that targets the goal of a careful review of a site with a structured and systematic approach.

Eidos strongly believes in the “classic” HazOp approach, the one defined by ICI and others during the 70s, that, in our experience, is the most challenging but leads to a more exhaustive analysis than the “library-based” and the “knowledge-based” approaches.

Site-wide HazOp is usually applied on:

  • A collection of plants. In this case please refer to Plant safety
  • Ancillaries. For example: production and distribution network of steam or nitrogen, Cooling water supply, etc. Due to their own nature, the deviation from the design and operational intent of these facilities can affect all the fed plants. The resulting top-events differ markedly from the ones identified during the HazOp of a single plant and they led to different top-events (the loss of fuel-gas to a furnace is a different scenario than the loss of fuel-gas to all the users, the loss of cooling water to one exchanger is a different top-event than the site-wide unavailability of cooling). The HazOp of the ancillaries site-wide HazOp is complementary to plant HazOp analysis of ancillaries.

As highlighted in Plant safety Hazop, to address the main implicit drawback of the HazOp method, Eidos usually provides the “Pre-HazOp safety review” that investigates the design and maintenance of the site ancillaries facilities before committing the HazOp sessions.

Eidos provides the whole HazOp team (chairman/facilitator and scribe) at your premises using one of the following languages: English, Spanish, Portuguese, Italian and Catalan (so we are able to use the native languages of more than one billion people!).

Eidos develops HazOp analysis using IEC 61882:2016 as reference and records the sessions using HazOp+ software by Isograph UK.
Hazop Analysis