Hazop study process in chemical plant|Hazop Worksheet|Risk matrix|How to perform Hazop study

Summary

In this video, the speaker explains the Hazard and Operability Study (HAZOP) process, detailing its purpose, pre-requisites, team structure, and step-by-step approach. HAZOP is conducted to identify risks in a process after detailed engineering is completed. The process involves defining nodes, analyzing deviations, causes, consequences, safeguards, and providing recommendations. The video emphasizes the importance of team roles, such as the chairman, scribe, and participants, in conducting effective discussions and risk evaluations. Additionally, it covers how risk matrices help assess the effectiveness of safeguards and recommendations in reducing potential risks.

Takeaways

• 😀 HAZOP (Hazard and Operability) study identifies potential hazards and operational issues in process designs.
• 😀 A HAZOP study is conducted after detailed engineering and once the P&ID (Piping and Instrumentation Diagram) is ready.
• 😀 Pre-requisites for HAZOP include P&ID, cause-and-effect diagrams, and process parameters (pressure, flow, temperature, etc.).
• 😀 The HAZOP team consists of a Chairman, a Scribe, and Participants, with a typical team size of 5-10 members.
• 😀 The Chairman leads the HAZOP study, while the Scribe records discussions, and the Participants provide input from their expertise.
• 😀 HAZOP studies are conducted at the node level, where each node represents a specific process function or component.
• 😀 Deviations are analyzed by combining guide words (e.g., high, low) with process parameters (e.g., pressure, temperature).
• 😀 Causes of deviations are identified, followed by an assessment of consequences and potential risks that could arise.
• 😀 Safeguards (e.g., alarms, interlocks) are identified to prevent or mitigate the consequences of process deviations.
• 😀 Recommendations are made for improving safeguards and minimizing risks if safeguards fail or if deviations occur.
• 😀 A Risk Matrix is used to evaluate the risk before and after recommendations are implemented, showing how risk is reduced.

Q & A

What is a Hazop Study and when is it conducted?

A Hazop (Hazard and Operability Study) is a structured method used to identify potential hazards and operability issues in a process. It is typically conducted after detailed engineering is completed and the P&ID (Piping and Instrumentation Diagram) is ready.

What are the key pre-requisites for conducting a Hazop Study?

The key pre-requisites for conducting a Hazop study include having a well-defined process, a completed P&ID, and cause-and-effect diagrams that outline the potential process deviations and their impacts.

Who are the members of a Hazop Study team, and what are their roles?

The Hazop Study team consists of a Chairman, a Scribe, and Participants. The Chairman leads and guides the study, the Scribe documents the discussions and findings, and the Participants provide inputs based on their expertise and knowledge of the process.

Why is the team size important in a Hazop Study?

The ideal team size for a Hazop Study is between 5 to 10 people. A larger team may lead to unproductive discussions, while a smaller team could result in biased analyses due to limited perspectives.

What is the purpose of the Hazop Worksheet, and what does it contain?

The Hazop Worksheet is a critical document used to record and analyze potential process deviations. It includes sections for process parameters, guide words, deviations, consequences, causes, safeguards, and recommendations.

How are process deviations identified in a Hazop Study?

Process deviations are identified by combining guide words (such as High, Low, More, Less) with process parameters (such as pressure, temperature, and flow rate). This helps determine potential deviations from the intended design or operational conditions.

What role does the Risk Matrix play in a Hazop Study?

The Risk Matrix is used to evaluate the severity and likelihood of risks associated with potential process deviations. It helps quantify the level of risk before and after safeguards and recommendations are applied.

What should be considered when documenting consequences in a Hazop Study?

When documenting consequences, it is important to focus on the consequences of deviations themselves, not the safeguards already in place. The potential impact of the deviation should be considered in the absence of safeguards.

What are the typical safeguards considered in a Hazop Study?

Safeguards in a Hazop Study include measures like alarms, trips, and interlocks, which are designed to prevent or mitigate the consequences of process deviations.

How are recommendations formed during a Hazop Study?

Recommendations are formed to address any gaps in the existing safeguards. If a safeguard fails, the team recommends alternative solutions to reduce the risk or eliminate the deviation, ensuring a safer and more reliable process.