DAILY Ex - 22 OCTOBER 2026

⚡ DAILY Ex | 22 OCTOBER 2026 

Explosion Protection | Operational Ex | Global Watch 

Today's focus: When chemical reactivity, equipment certification and operational control meet. 

Two developments lead today's edition: a hazardous chemical-tank emergency in the United States and a newly published UK explosion-protection standards notice. 

The common lesson is important for every Head of Operations: 

Explosion protection must address what can happen inside the process not only what can ignite outside it. 

▶️ 1. USA - CHEMICAL TANK EMERGENCY FORCES EVACUATIONS 

🔴 CURRENT INCIDENT | Toledo, Ohio - 20–21 October 

A hazardous-material release from an approximately 5,500-gallon intermodal tank containing glycidyl methacrylate triggered evacuations and shelter-in-place orders in Toledo. 

The US Environmental Protection Agency confirmed on 21 October that the tank was compromised and its contents were undergoing a chemical reaction. Emergency authorities decided that allowing the reaction to complete was safer than attempting further intervention. 

By 17:00 on 21 October, the evacuation radius had been reduced to half a mile, and the wider shelter-in-place order was lifted. 

The initiating failure mechanism has not been established. Reports describing an explosion should not be interpreted as confirmation of a particular ignition or reaction mechanism. https://toledo.oh.gov/news/2026/10/21/hazmat-evacuation-in-north-toledo 

Why it matters operationally 

Glycidyl methacrylate can undergo polymerisation under certain conditions. Heat, chemical incompatibility and inadequate control of reactive materials may create hazards beyond conventional flammable-vapour ignition. https://pubchem.ncbi.nlm.nih.gov/compounds/7837 

Management action: Review storage and transfer arrangements for reactive monomers, including temperature control, inhibitor requirements, material compatibility and emergency-response limitations. 

https://response.epa.gov/site/site_profile.aspx?site_id=17475 

▶️ 2. UK - NEW Ex DESIGNATED-STANDARDS NOTICE PUBLISHED TODAY 

🔴 NEW REGULATORY DEVELOPMENT | 22 October 2026 

The UK Department for Business and Trade has published Notice 0144/26, updating designated standards under the Equipment and Protective Systems Intended for Use in Potentially Explosive Atmospheres Regulations 2016. 

EN IEC 60079-28:2026 is now designated for protection of equipment and transmission systems using optical radiation. 

The previous EN 60079-28:2015 reference continues to provide a presumption of conformity with the corresponding essential requirements until 4 March 2028. 

This is a confirmed designation—not merely a proposed update. https://assets.publishing.service.gov.uk/media/6ace2fdc2de3184ccf8b8037/ds-0144-26-atex-notice.pdf 

Why it matters operationally 

Laser instruments, optical sensors and fibre-optic transmission systems can introduce ignition hazards. 

Management action: Review new GB-market product assessments and procurement specifications involving optical Ex equipment. 

https://assets.publishing.service.gov.uk/media/6ace2fdc2de3184ccf8b8037/ds-0144-26-atex-notice.pdf 

▶️ 3. STANDARDS WATCH - NEW IEC EDITIONS ARE NOT AUTOMATICALLY DESIGNATED 

📘 REGULATORY CLARIFICATION | Current UK list 

An interesting detail in today's UK notice deserves attention. 

Although IEC 60079-0:2026 has been published internationally, the UK designated-standards list still references EN IEC 60079-0:2018. 

Similarly, the list references EN 60079-1:2014, despite the newer IEC 60079-1:2026 publication. 

This illustrates the difference between an IEC technical revision and its adoption into a particular regulatory framework. https://assets.publishing.service.gov.uk/media/6ace2fdc2de3184ccf8b8037/ds-0144-26-atex-notice.pdf 

Why it matters operationally 

IEC publication ≠ IECEx certification basis ≠ EU harmonisation ≠ UK designation. 

Procurement teams must establish which requirements apply to the actual equipment and destination market. 

https://www.gov.uk/government/publications/designated-standards-atex 

▶️ 4. CHINA - NEW RESEARCH ON HYDROGEN CONTAINER VENTILATION 

🔬 RECENT RESEARCH | Published 15 October 2026 

A study in the Journal of Energy Storage investigated hydrogen leakage inside the semi-enclosed operating compartment of hydrogen tube-bundle containers. 

Researchers used computational fluid dynamics to compare natural and forced ventilation under a modelled 20 MPa hydrogen-release scenario. 

The findings indicate that increasing natural ventilation openings alone may not prevent dangerous hydrogen accumulation. 

Ventilation geometry, fan positioning and airflow rate significantly influenced the modelled hazardous zones. 

These results are scenario-specific modelling findings, not universal ventilation-design values. https://doi.org/10.1016/j.est.2026.123300 

Why it matters operationally 

Ventilation must be assessed against credible leakage conditions and actual equipment geometry. 

Engineering lesson: A nominal air-change rate does not, by itself, demonstrate adequate explosion prevention. 

https://doi.org/10.1016/j.est.2026.123300 

▶️ 5. HISTORICAL LESSON - POLYMER GROWTH CAUSED EQUIPMENT RUPTURE 

📘 DOCUMENTED INCIDENT | USA - 2019; final report 2022  

The https://www.csb.gov/ investigated the explosions at the TPC Group facility in Port Neches, Texas. 

The investigation established that popcorn polymer accumulated inside a temporary dead leg created when a process pump was removed from service. 

Over 114 days, polymer growth generated sufficient pressure to rupture piping. 

Released butadiene subsequently ignited, producing major explosions and fires. 

The investigation identified deficiencies in managing temporary equipment configurations and polymerisation hazards. https://www.csb.gov/tpc-port-neches-explosions-and-fire/ 

Why it matters operationally 

A process line can become dangerous even when it is not flowing. 

Historical lesson: Equipment isolation, temporary dead legs and extended shutdown conditions must be included in the process-hazard assessment. 

https://www.csb.gov/tpc-port-neches-explosions-and-fire/ 

▶️ 6. IECEx - TRAINING IS NOT CERTIFICATION OF COMPETENCE 

👷 COMPETENCE REFERENCE |  

IECEx distinguishes Recognised Training Providers from certification bodies authorised to issue Certificates of Personnel Competence. 

Completion of an IECEx-related training program does not automatically establish IECEx CoPC certification. 

Personnel must undergo the applicable competence assessment through an authorised IECEx certification body. https://www.iecex.com/certification-of-personnel-competencies-scheme/f-a-qs-certification-of-personnel-competencies-scheme/ 

Why it matters operationally 

A training record demonstrates participation. 

A competence assessment provides additional evidence of demonstrated capability. 

Management action: Verify individual competence and authorisation against the actual installation, maintenance, inspection or repair task. 

https://www.iecex.com/certification-of-personnel-competencies-scheme/f-a-qs-certification-of-personnel-competencies-scheme/ 

▶️ OPERATIONAL Ex USE CASE 

Reactive monomer storage - the tank is certified, but is the material stable? 

PRACTICAL | Illustrative scenario, not a finding about the Toledo incident 

A chemical facility stores a polymerisable monomer in a bulk tank. 

The tank is mechanically sound. 

Its electrical instrumentation is appropriately Ex-certified. 

The installation has passed inspection. 

However, the material requires defined storage conditions to remain stable. 

During maintenance, the temperature-control system becomes unavailable. 

Production continues because the tank is not actively being used. 

What could be overlooked? 

The material may remain chemically reactive even when transfer operations have stopped. 

The operator must verify the supplier's storage requirements, inhibitor effectiveness where applicable, temperature limits, credible reaction scenarios and emergency arrangements. 

Required decision: Do not continue storage outside verified safe conditions without an approved technical assessment and effective controls. 

Owner: Head of Operations, supported by Process Safety and Chemical Engineering. 

Measure: 100% of reactive-material storage systems operating within documented and verified limits, with deviations escalated. 

▶️ TODAY'S Ex QUESTION 

“Which hazardous substances at our facility can generate dangerous pressure or heat without an external ignition source?” 

Check reactive monomers, unstable intermediates, incompatible chemicals and materials susceptible to decomposition or polymerisation. 

Then verify whether the relevant controls remain effective during storage, maintenance, shutdown and abnormal operation. 

DAILY Ex | CLOSING THOUGHT 

Today's developments highlight an important distinction. 

Explosion prevention is not limited to preventing ignition of explosive atmospheres. 

Chemical reactions can generate heat. 

Pressure can increase. 

Containment can fail. 

A release can then create an explosive atmosphere. 

ATEX and IECEx provide essential frameworks for equipment conformity and explosion protection, but they do not replace the operator's responsibility for chemical-process safety. 

The Head of Operations must understand what the material can do, what the equipment is designed to withstand, and which protective barriers prevent escalation. 

Operational Ex connects those responsibilities throughout the plant's operating life.