Is a plant from 1975 automatically non-compliant under ATEX?
This is exactly where the discussion often goes wrong in practice. Older installations are sometimes judged in an overly black-and-white way. One side says: “No ATEX marking, therefore reject it.” The other side says: “This plant has been running for fifty years, so it must be safe.” Both positions are technically and legally too simplistic.
Explosion safety does not start with the year of construction. It starts with the question of whether an explosive atmosphere can occur. Are gases, vapours, mists or combustible dusts present? Is the installation located indoors or outdoors? Is there natural or mechanical ventilation? Are the quantities relevant? Can a flammable mixture arise during normal operation, foreseeable malfunction, filling, emptying, cleaning, inspection or maintenance?
Only after that comes the question of which hazardous area classification applies and which protective measures are required. But the year of construction does matter. A plant built in 1975 should not automatically be assessed as if it had been designed and placed on the market as a new installation in 2026. People were not unaware of fire and explosion hazards in 1975. Long before ATEX, there were permits, engineering practices, national rules, insurance requirements, standards, operating instructions and technical measures for preventing fire and explosion risks. An older installation may therefore have been carefully designed and built according to the state of the art applicable at that time.
That historical context must be taken into account. At the same time, age does not provide an exemption from current safety duties. An older plant may continue to operate only if the employer or operator can demonstrate today that the explosion risk is adequately controlled. In the European Union this means a current risk assessment under Directive 1999/92/EC, a defensible Explosion Protection Document, an up-to-date hazardous area classification, ignition source assessment, suitable technical and organisational measures, inspection, maintenance, instruction and competent operation. In the United Kingdom the same principle is reflected in DSEAR, supported by the Health and Safety at Work etc. Act, the Management of Health and Safety at Work Regulations and the relevant requirements for equipment and protective systems intended for potentially explosive atmospheres.
The most difficult cases arise after modifications. A plant from 1975 is rarely still exactly the same plant that was built in 1975. Different substances may have been introduced, capacities increased, filters replaced, ventilation systems altered, variable speed drives installed, control systems renewed, pipework changed, cleaning agents substituted or process steps added. Every relevant change can create a new assessment point.
At that stage, it is no longer sufficient to rely on “old law” or on the original design philosophy. The modified situation must be assessed again. The same applies to equipment. A motor, mixer, fan, pump, instrument or sensor installed before the ATEX product regime does not automatically need a modern ATEX 2014/34/EU or UKCA marking simply because it is old. But that does not mean it can remain in a hazardous area without evidence. Its suitability must be demonstrable.
That demonstration cannot be based on the statement: “It has worked well for years.” It requires a technical assessment of possible ignition sources, surface temperatures, mechanical friction, electrical condition, electrostatic charging, maintenance history, inspection findings, environmental influences and suitability for the classified zone and required Equipment Protection Level. For electrical installations this should align with the principles of EN IEC 60079-14 for design, selection and installation, and EN IEC 60079-17 for inspection and maintenance. For non-electrical equipment and mechanical ignition sources, EN ISO 80079-36 and EN ISO 80079-37 are relevant. Repairs, overhaul and reclamation should be considered against EN IEC 60079-19 where applicable.
The correct conclusion is therefore nuanced. An old plant does not need to be shut down simply because it is old. But an old plant may not continue to operate simply because it is old either.
The decisive criterion is evidence.
Can an explosive atmosphere occur? Are the quantities relevant? Has the hazardous area classification been correctly established? Is the equipment suitable for the zone and EPL? Have modifications been assessed? Are ignition sources controlled? Is the residual risk acceptable? Is this recorded in an Explosion Protection Document, or in equivalent UK documentation under DSEAR, in a way that is technically and legally defensible?
If the answer is yes, a plant from 1975 can still be operated safely and responsibly. If the answer is no, the problem is not the year of construction.
The problem is the absence of evidence.
The year of construction provides context. ATEX and DSEAR require demonstrable control.
Safety is not proven by age.
It is proven by assessment, measures, inspection and assurance.
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