September 2024 | AIChE

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September 2024

HAZOP/LOPA Study

The extension of a HAZOP Study to include aspects of a LOPA, including selecting identified scenarios for further analysis; evaluating the initiating event frequency, consequence severity and effectiveness of IPLs on an order-of-magnitude basis; considering enabling conditions and/or conditional...

Hazardous Material

In a broad sense, any substance or mixture of substances having properties capable of producing adverse effects to the health or safety of human beings or the environment. Material presenting dangers beyond the fire problems relating to flash point and boiling point. These dangers may arise from,...

Hazardous Chemical Reactivity

Any chemical reaction with the potential to exhibit rates of increase in temperature and/or pressure too high to be absorbed by the environment surrounding the system. Included are reactive materials and unstable materials.

Hazardous Chemical

A material that is toxic, reactive, or flammable and is capable of causing a process safety incident if released. Also Hazardous material.

Hazard Zone

For an incident that produces an outcome such as toxic release, the hazard zone is the area over which the airborne concentration equals or exceeds some level of concern. For a flammable release, the area of effect is based on a specified level of thermal radiation. For a release that results in...

Hazard Identification and Risk Analysis (HIRA)

A collective term that encompasses all activities involved in identifying hazards and evaluating risk at facilities, throughout their life cycle, to make certain that risks to employees, the public, or the environment are consistently controlled within the organization's risk tolerance.

Hazard Identification and Risk Analysis (HIRA)

CCPS RBPS Element 07: This Element addresses potential scenarios of what could go wrong by identifying the hazards, evaluating their risks, and determining if additional safeguards are needed.

Hazard Identification

Part of the Hazards Identification and Risk Analysis (HIRA) method in which the material and energy hazards of the process, along with the siting and layout of the facility, are identified so that a risk analysis can be performed on potential incident scenarios.

Hazard Evaluation

Identification of individual hazards of a system, determination of the mechanisms by which they could give rise to undesired events, and evaluation of the consequences of these events on health (including public health), environment and property. Uses qualitative techniques to pinpoint weaknesses...

Hazard Checklist

An experience-based list of hazards, potential incident situations, or other process safety concerns used to stimulate the identification of hazardous situations for a process or operation.

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