How to Comply with ATEX Regulations for Pressure Vessels in Explosive Atmospheres
How to Comply with ATEX Regulations for Pressure Vessels in Explosive Atmospheres
In high-risk industrial sectors, the presence of flammable gases, vapors, or combustible dust can turn ordinary operations into potentially explosive scenarios.
In such contexts, every plant component must be carefully selected and designed—and pressure vessels are no exception.
The ATEX Directives establish a strict regulatory framework that directly impacts design and manufacturing choices. Understanding how to apply them is not just about compliance: it means actively contributing to site safety, protecting people, and ensuring process continuity.
In this article, we’ll explore the key regulatory references, the concept of classified areas, the technical requirements for pressure vessels, and the concrete contribution Baglioni provides through certified, high-performance solutions.
ATEX Regulations: A Framework for Safety in Explosive Atmospheres
ATEX (short for ATmosphères Explosibles) is the European regulatory framework governing the design, manufacture, and use of equipment and protective systems intended for operation in explosive atmospheres.
It applies to all companies operating in industries where flammable gases, vapors, mists, or combustible dust may be present in concentrations capable of creating explosive atmospheres.
Typical sectors include chemical, petrochemical, pharmaceutical, food, waste treatment, energy, and automotive. In these areas, ATEX compliance is not just a legal requirement but a fundamental condition for ensuring business continuity and protecting people and plants.
The legislative framework consists of two complementary directives, each defining obligations for different stakeholders but sharing the same goal: preventing explosions and ensuring workplace safety.
- ATEX Products (Directive 2014/34/EU)
- ATEX Workplace (Directive 99/92/EC)
Directive 2014/34/EU – Products
Also known as “ATEX Products,” Directive 2014/34/EU governs equipment and protective systems intended for use in potentially explosive zones. It applies to all products that, under normal or abnormal operating conditions, could become an ignition source.
The directive mainly addresses manufacturers, requiring them to:
- Comply with the Essential Health and Safety Requirements (EHSRs) listed in Annex II of the directive.
- Ensure design conformity with the protection categories defined according to the risk level of the target environment (Zone 0, 1, 2 for gases; Zone 20, 21, 22 for dust).
- Submit the product to a conformity assessment procedure, which may involve a Notified Body (NB) for higher-risk categories.
- Affix the CE marking followed by the Ex symbol, along with information on category, equipment group, and type of protection.
- Provide comprehensive technical documentation, including the technical file, user manual, and EU Declaration of Conformity.
This directive ensures that every piece of equipment placed on the European market is suitable for safe operation in explosive atmospheres.
Directive 99/92/EC – Workplaces
Known as “ATEX Workplace,” Directive 99/92/EC focuses on protecting workers operating in potentially explosive environments.
It applies to employers and imposes obligations to identify, assess, and manage explosion risks within plants.
Specifically, it requires:
- Explosion risk assessment, considering emission sources, hazardous substance concentrations, and possible ignition points.
- Classification of areas into ATEX zones based on the frequency and duration of explosive atmospheres.
- Selection of equipment suitable for the identified zone, compliant with Directive 2014/34/EU.
- Implementation of technical and organizational measures to prevent the formation of explosive atmospheres or limit their effects.
- Training of personnel to ensure awareness of specific risks and safety procedures.
- Preparation and continuous updating of the Explosion Protection Document (EPD).
This directive enforces a systematic approach to managing explosion risks, requiring preventive planning, detailed documentation, and continuous monitoring of operating conditions.
ATEX Regulations: Zone Classification and Associated Risks
A key aspect of ATEX compliance is the classification of areas based on the likelihood of explosive atmospheres forming.
Zones are divided between those involving gases, vapors, mists, and those involving combustible dust.
For gases, vapors, and mists:
- Zone 0: explosive atmosphere present continuously or for long periods.
- Zone 1: explosive atmosphere present occasionally during normal operation.
- Zone 2: explosive atmosphere unlikely and short-lived.
For combustible dust:
- Zone 20: explosive dust cloud present continuously or frequently.
- Zone 21: explosive atmosphere present occasionally during normal operation.
- Zone 22: explosive atmosphere unlikely and short-lived.
The main hazards in ATEX zones are accidental ignitions caused by electrical sparks, hot surfaces, static discharges, or chemical reactions—all potential triggers of explosions with severe consequences for people, facilities, and the environment.
Proper classification of areas and the use of ATEX-certified components are crucial to mitigating risks and ensuring regulatory compliance.
Requirements for Pressure Vessels in ATEX Environments
Pressure vessels intended for installation in ATEX-classified zones must meet precise technical requirements to minimize ignition risks and withstand demanding environmental and operational conditions.
Essential Technical Features
- Non-sparking, corrosion-resistant materials: stainless steels or special alloys with specific surface treatments to prevent sparks and resist aggressive substances.
- Safe design: all components, including accessories and fittings, must be engineered to minimize hot surfaces and ignition points.
- Grounding and electrical continuity: vessels must include conductive connections and electrostatic discharge devices to prevent charge build-up.
- ATEX-certified accessories: valves, pressure switches, indicators, and instruments must carry specific certification for explosive atmospheres.
- Comprehensive documentation and CE ATEX marking: each vessel must be supplied with a Declaration of Conformity, technical manual, identification plates, and clear ATEX category labeling.
Preventive maintenance plans, visual inspections, and periodic checks—carried out according to regulatory requirements and manufacturer guidelines—are also essential.
Our ATEX-Compliant Solutions
At Baglioni, we have long designed and manufactured ATEX-certified pressure vessels, contributing to the protection of people, facilities, and the environment in the most critical industrial contexts.
Our offering includes:
- Tailor-made design for each ATEX zone: analysis of the application, zone classification, and physical-chemical properties of the gases or dust handled to define the optimal configuration.
- Fully traceable materials and components: all materials are ATEX-certified and accompanied by complete documentation, including required conformity tests.
- Integrated grounding systems: vessels designed with guaranteed electrical continuity, protecting plants from hazardous electrostatic discharges.
- Rigorous testing and safety checks: every vessel undergoes pressure testing, non-destructive inspections, and functional checks, with Notified Body involvement when required.
- Regulatory consulting support: technical assistance in product selection, documentation management, and upgrading existing plants to ATEX compliance.
Thanks to our expertise—reinforced by continuous regulatory updates and collaboration with Notified Bodies—we deliver tailor-made solutions that combine safety, reliability, and full ATEX compliance.
Want to know more about our ATEX-certified vessels? Contact us.
