Control Systems
Commissioning Safety
Safe transition from construction to operations on UAE projects — energisation, pressure testing, system handover, permit-to-live, and management of construction/commissioning interfaces.
v2.0Updated 15 Feb 2026ADOSH-SF v4.1 (February 2026)Learning Objectives
- Distinguish construction, pre-commissioning, commissioning and operation phases.
- Apply permit-to-live and permit-to-commission procedures.
- Manage pressure/leak testing and first-fill safely.
- Control mixed-mode zones where trades and live systems coexist.
- Complete a safe system handover to the operator/end-client.
Awareness Video
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1. Phase Boundaries
Construction: unpowered/uncharged installation. Pre-commissioning: flushing, cleaning, static tests. Commissioning: energising and functional testing. Operation: normal use. Each transition changes the risk profile — controls must change with it, not stay static.
2. Permit-to-Live & Permit-to-Commission
Permit-to-Live authorises first energisation of an electrical/mechanical system. Permit-to-Commission covers ongoing dynamic testing. Both require: as-built verification, isolation records, LOTO release plan, commissioning team briefed, and exclusion of non-essential workers.
3. Pressure & Leak Testing
Hydrostatic preferred over pneumatic — stored energy in compressed gas is dangerous. Test envelope: exclusion zone, blinds/blanks verified, gauges calibrated, ramp slowly, hold, depressurise slowly. Never approach a pressurised system to fix a leak — depressurise first.
4. First-Fill & Chemical Handling
Chemical cleaning, glycol fills, refrigerant charging — SDS-based risk assessment, spill kits, ventilation, PPE (chemical-resistant gloves, face shield). Pump start-up: check rotation before coupling load; no-load run then step to duty.
5. Mixed-Mode Zones
Construction trades and live commissioning cannot share the same zone without SIMOPS controls. Physical barriers, live/no-live signage, RF/radio protocol, and a commissioning manager who authorises entry. When in doubt — de-energise.
6. System Handover
Handover pack: as-built drawings, test certificates, calibration records, O&M manuals, spare parts, operator training records. End-client signs acceptance. Construction PPE and permits close out; operational HSE regime takes over. No 'soft' handovers.
Knowledge Assessment
1. Pre-commissioning is:
2. First energisation of a system requires:
3. Preferred pressure test medium is:
4. If a pressurised system leaks you should:
5. Chemical first-fill needs:
6. Pump start-up should:
7. Construction and live commissioning in the same zone:
8. A system handover pack should include:
9. LOTO devices during commissioning are released:
10. Commissioning risk profile compared to construction:
Certificate
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Acknowledgement
By signing below, you confirm you have watched the awareness video, understood the material, and will apply these controls on site.
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