What the DPCE brings together
In Spain, the explosion protection document records how these risks have been identified and assessed and which measures control the installation. It connects substances, operations, zones, equipment and work organisation. Its value is making decisions understandable and verifiable. A coloured zoning plan or list of certified equipment does not, by itself, constitute a complete assessment.
Related concept: Explosive atmospheres.
Necessary technical content
It must explain release sources, the circumstances in which explosive atmospheres form and possible ignition sources. It includes area classification and preventive and protective measures. Each conclusion should refer to identifiable product data, calculations, drawings or checks, avoiding generic statements that leave the assessed installation unclear.
Organisation and non-routine work
Cleaning, maintenance, welding and contractor activities can change normal production conditions. The document must connect these situations with instructions, training, permits and coordination. Maintaining the safety of equipment, warning systems and protective measures also matters. Responsibilities must be operationally clear: who checks, who authorises and what happens when a deviation occurs.
Preparation and review
Spain’s Royal Decree 681/2003 requires preparation before work starts and review following significant changes to the workplace, equipment or organisation. A practical review compares the document with the actual installation. Changing a solvent, increasing flow, introducing finer dust or relocating a discharge can invalidate earlier assumptions.
Example of an extension
A hypothetical company adds a hopper to an existing line. The DPCE is reviewed to examine emissions, connections and explosion propagation, alongside the new zones. Cleaning instructions and protective-system maintenance are updated. Filing only the hopper certificate would leave its integration with the installation unresolved.
Scope and limitations
The DPCE is a preventive document, not a permanent guarantee or universal approval. It may incorporate existing documentation where that covers the required analysis. The framework described applies to Spain; other countries use different requirements. Its extent should be proportionate to the risk, with enough evidence to follow the decision, without replacing technical information with a large number of pages.
