What comes next?

Step 1 - Explosion protection (Ex compliance) ⬇ Step 2 - Industrial operation

The founding principle of explosion safety engineering: in hazardous industries, safe operation is only possible once Ex compliance is in place.

Explosion protection as the foundation of safe operation in hazardous-area industries

Sectors that handle flammable gases, vapours, mists or combustible dusts face a constant risk of explosion. Industries such as oil and gas, petrochemical processing, chemicals, hydrogen handling, grain processing, mining and fuel distribution regularly create conditions in which an explosive atmosphere can form. In these environments the safe operation of equipment and facilities depends fundamentally on explosion protection (Ex) compliance.

Explosion protection is therefore not merely a regulatory requirement or a documentation exercise. It is a precondition of safe industrial operation. Without it, operating a hazardous industry cannot be considered controlled or safe.

The nature of operating in hazardous areas

A hazardous area is a place where an explosive atmosphere may form, and where special measures are therefore needed to design, install and use equipment. An explosive atmosphere arises when the three elements of the explosion triangle are present:

• Flammable substance (gas, vapour, mist or dust)
• Oxygen (usually from the air)
• Ignition source

Industrial processes often cannot eliminate the first two. Hydrocarbons, solvents, hydrogen and dusts come with production. Oxygen is present in the ambient air. The engineering focus therefore falls on controlling ignition sources and reducing the likelihood that an explosive atmosphere forms.

Explosion protection engineering as the very first step

Explosion protection engineering creates the technical and organisational framework that lets industrial processes run safely in the presence of flammable substances. Several key steps have to be completed before an industrial facility can go into service.

Hazardous area classification

The first step is identifying and classifying the hazardous zones. On the basis of standards such as IEC 60079-10-1 (gas) and IEC 60079-10-2 (dust), areas are classified by the likelihood and the duration of an explosive atmosphere. The typical classifications are:

Hazardous area classification (HAC) yields the EPL (equipment protection level), which sets the minimum safety requirements for the installation, for operation and for much else besides.

Selecting explosion-protected equipment

Once the zones are defined, equipment has to be selected according to the appropriate type of protection. For example:

• Ex d (flameproof enclosure) - contains an internal explosion
• Ex e (increased safety) - prevents arcs and sparks from forming
• Ex i (intrinsic safety) - limits electrical energy
• Ex p (pressurisation) - keeps an explosive atmosphere out of the equipment
• Ex t (dust protection) - prevents dust from igniting
• Ex h (protection of non-electrical equipment)
• …

Engineering design and installation

Explosion protection also bears on the following:

• Design of electrical systems
• Selection of cables and cable glands
• Earthing and equipotential bonding
• Temperature class compatibility
• Design of mechanical equipment
• Ventilation and gas detection

Installation has to follow standards such as IEC 60079-14, which governs electrical (and non-electrical) installations in explosive atmospheres.

Verification, inspection and documentation

Before commissioning, the system has to be verified through:

• Initial inspection
• Review of equipment certification
• Verification dossiers
• Explosion protection documentation

Standards such as IEC 60079-14/-17 set out the inspection requirements that keep an installation compliant through its operating life. This documentation provides traceability and assurance that every component in the hazardous zone has been properly assessed. See: EPD (explosion protection document), VD (verification dossier) - for full life-cycle traceability in hazardous-area industries.

From compliance to operation

Industrial operation can begin once the explosion protection engineering is complete. Put another way: Ex compliance is what makes safe operation possible. In the operating phase, industries such as:

• Oil refineries
• Gas processing plants
• LNG terminals
• Chemical production facilities
• Fuel storage depots
• Hydrogen infrastructure
• Grain silos and mills

handle large quantities of flammable (Ex) material.

The safe operation of pumps, compressors, valves, vessels, reactors and electrical systems rests on explosion protection principles having been applied correctly at the design stage.

Operating in hazardous industries

After commissioning, hazardous facilities have to maintain explosion protection continuously through:

• Regular inspections
• Preventive maintenance
• Management of change (MOC)
• Competence of personnel
• Control of ignition sources

Any change to equipment or to process conditions can affect the hazardous area classification, or create new ignition risks.

What follows when Ex compliance is missing

History has shown many times what comes of disregarding explosion protection. Industrial explosions have been caused by, among other things:

• Use of uncertified equipment
• Use of unsuitable cable glands
• Hot surfaces exceeding the temperature class
• Electrostatic discharge
• Mechanical sparking
• Accumulated dust
• …

Such events can lead to catastrophic explosions, loss of life, environmental damage and significant economic loss.

Explosion protection as a systems-level discipline

Explosion protection is therefore best understood as a systems-level engineering framework, integrating:

• process safety
• electrical engineering design
• mechanical engineering design
• materials science
• operations management
• …

This links regulatory compliance (the ATEX directives or the IECEx schemes, for example) to practical industrial engineering. Rather than constraining operations, Ex compliance is what lets industries handle safely the high-energy, flammable materials that modern economies depend on.

A note: access to the information - to the documentation - is fundamental.

Good luck!