What Happens After a HAZOP Study?

Once the HAZOP meetings are finished, the real work starts. The value is in what you do with the actions, not in the workshop itself.
This article covers:

• What a good HAZOP report should contain (SANS 1461 requirements).
• How to manage and close out action items effectively.
• Typical action close-out timelines and costs in South Africa.
• When to update drawings, procedures, and emergency plans.
• When you need to repeat or update the HAZOP.

1. The HAZOP Report: Your Roadmap

The immediate output of the study is the HAZOP report. This isn't just a formality; it's a legal record of your due diligence and a key deliverable for MHI compliance.

What a Quality Report Includes

A compliant HAZOP report (aligned with SANS 1461:2018) should contain:

SA Regulatory Context

Under the MHI Regulations 2022, the HAZOP report forms part of your MHI Risk Assessment documentation. The Department of Employment and Labour (or your AIA) may request it during audits or incident investigations.
Ensure your report explicitly links recommendations to specific scenarios. "Check pump spec" is vague. "Verify Pump P-101 deadhead pressure rating against discharge piping MAWP to prevent rupture" is actionable and clear.

2. Action Items Management: The Critical Phase

The core output of a HAZOP is the list of recommendations or "action items." This is where many South African facilities fail – the study is done, but the actions never get closed.

Assigning Responsibility

Every action item must have:

1. A Single Owner: "Engineering Dept" is not an owner. "Lead Process Engineer – John Mokoena" is.
2. A Due Date: "ASAP" is not a date. Set realistic deadlines based on risk priority.
3. A Priority Level: Use a consistent scale (e.g., Critical / High / Medium / Low).

Priority Classification

The Tracking System

Don't manage HAZOP actions in a spreadsheet that gets lost on a shared drive. Use a formal tracking system:

• Dedicated software: PHA-Pro, Sphera, or SAP EHS modules.
• Maintenance management system: Integrate with your CMMS (e.g., SAP PM, Maximo).
• Simple but controlled: A shared Action Tracking Register with version control and monthly management review.
  Management should review the register monthly until all high-priority items are closed.

3. Implementation: Turning Recommendations into Reality

Recommendations usually fall into three categories, each requiring a different approach and budget:

Engineering Changes (Hardware)

Examples: Installing a new PSV, adding a high-level alarm, upgrading a pump, or rerouting a pipe.

• Requirement: Detailed design, budget approval, and often a plant shutdown to install.


• Watch Out: Ensure these changes go through a Management of Change (MoC) process. You don't want your solution to create a new hazard!
  
  Typical SA Costs:
  

  Change Type	Indicative Cost (excl. VAT)
  Install high-level alarm (SIL-rated)	R50 000 – R150 000
  Add pressure relief valve (PSV)	R80 000 – R250 000
  Install gas detection system (single point)	R30 000 – R80 000
  Major piping modification	R200 000 – R1 000 000+
  Procedural Changes (Software)

  Examples: Updating SOPs, changing operator rounds, modifying alarm setpoints.

  • Requirement: Update the documents, but more importantly, train the staff. A procedure change that operators don't know about is useless.
  • Cost: Primarily labour time; formal training sessions may cost R5 000 – R20 000 per session.

  Further Studies

  Examples: "Check relief valve sizing" or "Conduct LOPA for this scenario."

  • Requirement: These are not "fixes" yet. They are investigations. Ensure the output feeds back into the risk assessment.
  • Common follow-up studies:
  • LOPA (Layer of Protection Analysis): R30 000 – R80 000 per scenario.
  • SIL Verification: R20 000 – R50 000 per SIF.
  • Relief valve sizing study: R15 000 – R40 000 per valve.
    (Learn more about Quantitative Risk Analysis if the risk is significant.)

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  4. Closing the Loop: Verification

  You cannot simply mark an item as "Done." You must verify it.

  Evidence-Based Closure

  Action Type	Acceptable Closure Evidence
  Install instrument	Commissioning report, loop test, photo
  Update procedure	Signed revision, training attendance record
  Conduct study	Study report with conclusions
  Modify piping	As-built P&ID, pressure test certificate

  Sign-Off

  A senior engineer or manager should sign off on the closure of critical action items. For MHI facilities, the AIA may review your action close-out status during the next assessment.

  SA Best Practice

  Many South African facilities (Sasol, Engen, AECI) use a "3-tier" sign-off:

  1. Action Owner – confirms work complete.
  2. HAZOP Leader / Process Safety Engineer – verifies evidence.
  3. Plant Manager / SHE Manager – approves closure.

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  5. Updating Process Safety Information (PSI)

  A HAZOP often reveals discrepancies between the paperwork and the plant. After the study (and after implementing actions), you must update your:

  • P&IDs: To reflect the "as-built" status or new modifications.
  • Operating Procedures: To include new safeguards or steps.
  • Emergency Response Plans: If new major accident scenarios were identified. (See SANS 1514 for ERP requirements.)
  • Process Safety Data Sheets: If new hazardous materials or conditions were identified.

  Document Control

  Ensure all updates go through your document control system with:

  • Revision number and date.
  • Reason for change (link to HAZOP action).
  • Approval signatures.

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  6. Re-HAZOP: When Do You Do It Again?

  The MHI Regulations and best practice dictate that a HAZOP is not a one-time event. You need to revisit it:

  Mandatory Triggers

  Trigger	Requirement
  5-Year Cycle	MHI Regulations require reassessment every 5 years
  Major Modification	Any change affecting process safety (MoC HAZOP)
  After an Incident	Review HAZOP if accident wasn't predicted
  Regulatory Request	Department of Employment and Labour or AIA audit finding

  What is a "Major Modification"?

  Under MoC principles, a HAZOP (or HAZOP update) is required for:

  • New process units or equipment.
  • Changes to operating conditions (temperature, pressure, flow).
  • Introduction of new hazardous materials.
  • Changes to control philosophy or safety systems.
  • Significant changes to site layout or occupied buildings.
    (See the MHI Assessment Timeline for more on the 5-year cycle.)

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  7. Common Pitfalls in South Africa

  Based on our experience across hundreds of HAZOP studies:

  • Actions assigned to departments, not individuals – no accountability.
  • No formal tracking system – actions get lost in email chains.
  • Closing actions without evidence – "it's done" is not proof.
  • Ignoring "further study" actions – these often reveal the biggest risks.
  • Not updating P&IDs – the next HAZOP starts with wrong information.
  • Skipping MoC for "small" changes – small changes cause big accidents.

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  Conclusion

  The end of the HAZOP workshop is the start of the risk reduction journey. By systematically managing action items, verifying their implementation, and updating your process safety information, you ensure that your facility is not just compliant on paper, but safer in reality.
  Key takeaways:

  • Assign every action to a named individual with a due date.
  • Use a formal tracking system with monthly management review.
  • Close actions with documented evidence, not just emails.
  • Update P&IDs, procedures, and ERPs after implementation.
  • Plan for re-HAZOP every 5 years or after major changes.

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  Need Help Closing Out HAZOP Actions?

  MMRisk provides end-to-end process safety support, from facilitation to action item management and close-out verification.
  Our services include:

  • HAZOP action tracking and progress reporting.
  • Engineering design support for hardware changes.
  • LOPA and SIL studies for high-risk scenarios.
  • P&ID and procedure updates.
  • MoC HAZOP facilitation.
    Typical action close-out support: R15 000 – R50 000 per month (depending on action volume).
    Contact us today to ensure your HAZOP adds real value.