During preliminary stages of a project HazId is used to assess, in a semi-quantitative way (risk matrix), the major risks related to the project.
Eidos believes that HazId is a useful instrument during the early steps of a new project but, in later stages when more project details became available, HazId will lose its charm and the methods showcased in the Top-events identification page are best suited.
HazId are usually developed during the following stages:
- the early phases of a new project to help the customer/engineering firm assessing the safety in a faster way
- the verification, required by the Management of Change system, that the proposed modification of a site/plant will not impact the “no-increase of risk” policy. In this case Eidos can provide to the customer a fast and flexible way of evaluating different proposed modifications in terms of:
- increase of risk by frequency or severity of consequences
- spread of risk to surrounding areas by magnitude of consequences and exposure levels
Of course Eidos “engineering first” approach will support customers in seeking solution that will cope with policies
Eidos uses sometimes also a hybrid approach where the identification of the top-event is done using the “HazId” approach but the following risk quantification is based on a full quantitative approach (fault trees – event trees – consequences calculation): no unpleasant surprises in later stages!