Completion
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1
MOC Identification
Initiation
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Complete all required fields (*) before proceeding to Section 2. This information is used to identify and track the MOC through its lifecycle.
Use your site's numbering convention. Format: MOC-YYYY-NNN. This number is your unique identifier — keep it consistent with your MOC register.
Date the MOC request was formally raised — not when the work starts.
Target date by which the change must be in place. Leave blank if not time-critical. Used for planning the review timeline.
Plant unit, process area or location where the change will be made. Be specific — e.g. Unit 400 — Wet Closed Drain.
Equipment tag number(s) directly affected by the change. Use tags as shown on the P&ID. Multiple tags: separate with commas.
Person raising the MOC — full name and job title or function. This person is responsible for completing Section 1 and following up on the review process.
Department initiating the change — e.g. Process Engineering, Operations, Maintenance, Instrumentation.
Permanent — change remains indefinitely. |
Temporary — limited duration; fill in valid-from/until dates below. |
Emergency — immediate safety need; full MOC review to follow within agreed timeframe. |
RIK — identical replacement; reduced review required.
Be specific and technical. Include: what is changing, why it is needed, which systems are affected (tag numbers, P&ID references), and the engineering basis (calculations, standards, supplier recommendations). Reviewers rely on this description to assess risk.
Rough order-of-magnitude cost estimate for budgeting and approval purposes. Break down into materials, labor, and total if possible. Not mandatory but useful for management approval.
Initial screening — not a full hazard review. Note obvious risks: fire/explosion, toxic exposure, pressure hazards, environmental permit implications, noise, waste streams. A full hazard review is done in Section 3.
Initial assessment by the originator — confirmed during hazard review in Section 3.
Low: minimal safety/environmental impact.
Medium: moderate impact, standard review required.
High: significant safety/environmental risk, extended review and senior sign-off required.
When in doubt — select High.
Name of the PSM or safety lead who will conduct the initial safety screening and confirm the change type classification. Required for Medium and High risk changes.
2
Initial Review
Classification
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ℹ️ Purpose: Determine whether this qualifies as a full MOC, a Replacement in Kind (RIK), or is not worth pursuing. Involve the relevant discipline leads before committing to a full review. Tick each item when confirmed — mark N/A only where the item genuinely does not apply.
Proposed change has been reviewed and decision to pursue confirmed
If not pursued, RFC is completed and returned to originator
Change classified per MOC definition (not a "Replacement in Kind")
If classified as RIK (Replacement in Kind), proceed outside full MOC system; RFC filed for audit trail
Temporary change justification documented (if applicable)
Reason for temporary designation, additional precautions, contingency plan, person responsible for reversal
Multidisciplinary review requirement determined
Yes → full team review; No → individual review is sufficient
Relevant personnel engaged in reviewing potential impact of change
Operations, maintenance, safety officers and other affected disciplines involved before hazard review begins
Change communicated to all affected teams (toolbox talk, safety meeting, or written notice)
Confirm that operators, maintenance staff and contractors are aware of the proposed change and its safety implications
3
Hazard Review
Safety Analysis
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ℹ️ Purpose: Identify all hazards introduced or changed by this MOC. Select an appropriate review technique based on risk level. High risk changes require a formal HAZOP or What-if study with a multidisciplinary team. Apply the hierarchy of controls: Elimination → Substitution → Engineering controls → Administrative controls → PPE.
Select No only for very minor administrative changes with no process safety impact. When in doubt — select Yes.
HAZOP/What-if: complex or high-risk changes. Checklist: straightforward low/medium risk. LOPA: where quantified risk reduction is required. Match technique to risk level.
Qualified person facilitating the hazard review — typically the Process Safety Engineer or HSE lead. Responsible for the review output and action items.
Process safety review conducted — potential hazards identified
Includes fire/explosion, toxic release, overpressure, reactive hazards
Occupational Safety / Industrial Hygiene review completed
Noise, exposure to chemicals, ergonomics, confined space implications
Environmental review completed
Emissions, waste streams, regulatory permit implications (Wabo, Richtlijn Industriële Emissies)
Required controls for implementation documented
Action items, responsible parties, target dates assigned
Risk hierarchy applied — Elimination / Substitution considered first
Can the change be designed to eliminate or substitute the hazard at source? Document outcome.
Engineering controls defined and verified (SIL/SIS, interlocks, relief valves, alarms)
Primary layer of protection before administrative controls or PPE
Administrative controls and PPE requirements defined (last line of defence)
Operating limits, permits, PPE specification; only applied where engineering controls are insufficient
Sketch / drawing attached or referenced (P&ID mark-up, isometric, etc.)
Summarise the hazards identified during the review and the controls required. For each action item include: what needs to be done, who is responsible, and the target completion date. All action items must be closed before Section 6 authorization.
4
Pre-Implementation Tasks
Authorization
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ℹ️ Purpose: Ensure all operational, maintenance, and safety procedures are updated before the change is implemented. Training must be completed and all affected personnel informed. Do not proceed to Section 6 authorization until all applicable items are checked or marked N/A with justification.
Startup / Shutdown / Emergency Shutdown procedures reviewed and updated
Normal Operation procedures reviewed and updated
Maintenance procedures reviewed and updated
Emergency Response procedures reviewed and updated
All affected personnel informed of the change
Training completed for Operations, Maintenance, Contractors as applicable
All personnel have received and understood training; permanent training materials updated
PSSR (Pre-Startup Safety Review) requirement assessed
Person responsible for updating and issuing revised procedures. Must confirm all procedure updates are complete before authorization.
Person responsible for delivering and recording training. Keep attendance records on file.
Pre-Startup Safety Review number if a PSSR is required. A PSSR is typically needed for major changes affecting process safety. Leave blank if not required.
5
Process Safety Information Update
Documentation
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ℹ️ Purpose: Ensure all process safety documentation is updated to reflect the change. Outdated P&IDs and procedures are a major cause of incidents. Items marked here must be completed and verified at close-out (Section 7). Mark N/A only if a document type is genuinely not affected.
P&ID updated / revision scheduled
Process Flow Diagram (PFD) updated / revision scheduled
Electrical system documentation updated
Relief system documentation updated (PSV datasheets, DIERS calcs)
Spare parts list updated
MSDS / SDS updated for new or changed chemicals
Documented Operating Limits (min/max T, P, flow, composition) updated
Other affected process safety information identified and revision scheduled
6
Authorization to Implement
Approval
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All pre-implementation tasks confirmed complete
Change implemented using controls specified by site procedures and MOC review
Document any specific conditions attached to the authorization — e.g. "Valid only for Unit 3 turnaround window", "Requires additional sign-off from HSEQ director if scope increases". Leave blank if authorization is unconditional.
7
Close-out Review
Closure
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ℹ️ Purpose: Formally close the MOC once all tasks are complete and the change is operating as expected. Do not close out until the monitoring period is finished and all documentation is updated. A completed close-out is required for audit compliance.
All post-implementation tasks completed
All indicated process safety information revisions completed (Section 5)
Temporary change removal confirmed (if applicable)
System returned to original state; reversal verified by responsible person
MOC documentation complete and filed
Post-implementation monitoring period completed — system operates as expected
Confirm no new hazards, deviations, or unexpected process behaviour observed during initial operating period
Lessons learned captured and incorporated into future procedures or training
Share findings with relevant teams; update training materials and site MOC procedure as applicable
Define how long the change will be monitored after startup — typically 14–90 days depending on risk level. High-risk changes require longer monitoring periods.
Person responsible for monitoring performance and reporting any deviations or unexpected behaviour during the monitoring period.
Date the monitoring period officially ended with satisfactory results. Required before signing close-out below.
Capture what was learned during this MOC — both positive and negative. Consider: Was the hazard review adequate? Were the procedures clear? Was training effective? Were timelines realistic? Share findings with the MOC coordinator and relevant teams to improve future MOCs.
✔ This change has met all appropriate review requirements and is hereby approved. Safety, health, and environmental concerns have been addressed; procedures revised; training completed; all affected process safety information updated.
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Reference Documents & Evidence
P&IDs · Datasheets · Reports · Permits · Photos · Any relevant file
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ℹ️ Purpose: Attach or reference all supporting documents used in this MOC — updated P&IDs, datasheets, permits, calculation reports, photos, approval emails. This creates a complete audit trail. For each document add a description, document type, revision/date, and a URL or SharePoint link if available. Click the 🔗 icon to verify the link opens correctly.
Document description
Document type
Rev / Date
URL / Link (optional)
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