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process safety · chemical operations

Chemical release mitigation event tree

A chemical release event tree shows how detection, physical containment and emergency response influence the consequence after a toxic release. The initiating event is followed by each barrier in the order it can act. Successful detection and containment can keep the exposure local, while failures lead to onsite or uncontrolled exposure paths. Emergency response is included only on the branch where it can still control the release. This structure helps process-safety teams test whether the barriers are independent, correctly ordered and supported by credible procedures. Use actual inspection evidence, response drills and equipment reliability information before relying on the probabilities for a quantitative assessment. The diagram is particularly useful as a shared review artifact in a HAZOP follow-up or layer-of-protection discussion.

類型 事件樹標準 IEC 62502:2010引擎 schematex-eventtree更新時間 2026/9/24
Chemical release mitigation
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需求

“Create an event tree for a toxic chemical release with gas detection, secondary containment, and emergency response barriers, ending in contained exposure, offsite response, onsite exposure, or uncontrolled exposure.”

接著試試Add an evacuation barrier after emergency response.Change the containment failure probability to 0.03.
這張圖裡有什麼

看懂背後的決策。

01Alarm detection

Detection begins the response sequence.

02Physical containment

Secondary containment limits spread before responders intervene.

03Response barrier

Emergency response is considered only where it can still alter the outcome.

Use for a workshop-level hazard assessment and supplement it with site-specific consequence modelling.

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常見問題

常見問題

What is secondary containment?

It is a physical feature such as a bund, dike or enclosed drain that limits the spread of released material.

How should barriers be ordered?

Order them by when they can affect the scenario, from detection through physical mitigation and response.

Can outcomes include people and environmental effects?

Yes. Name the outcome so it describes the consequence your assessment needs to compare.