A shutdown removes the atmosphere that makes a drone dangerous. Flying a live process area does not, and no amount of procedure converts a standard aircraft into equipment that belongs there.
The Zone Is a Statement About Probability
Hazardous area classification does not describe how dangerous a place is. It describes how often an explosive atmosphere is expected to be present there, and that distinction governs what equipment may enter.
For gases, IEC 60079-10-1 sets three zones. Zone 0 is where an explosive gas atmosphere is present continuously, for long periods or frequently, such as the vapour space inside a closed tank of flammable liquid. Zone 1 is where it is likely to occur occasionally during normal operation, such as the area around a pump seal. Zone 2 is where it is not likely in normal operation and, if it occurs, persists only briefly, typically the perimeter around a Zone 1 area.
Combustible dusts are classified in parallel under IEC 60079-10-2, as Zones 20, 21 and 22 on the same frequency logic, which matters on bulk handling and process plant as much as on hydrocarbon facilities.
A zone is not a measure of how bad an incident would be. It is a statement about how often the conditions for one are already present, which is why the answer is equipment selection rather than caution.
The reason this framing matters for aviation work is that the zone exists whether or not anyone is flying. A Zone 1 area is Zone 1 on a quiet afternoon with no work in progress. Introducing an ignition source into it is not a risk that careful operation reduces; it is a hazard the classification was created to exclude.
Why a Standard Drone Is an Ignition Source
Nothing about a conventional multirotor is designed for an explosive atmosphere, and the ignition risk is not one thing but several.
It carries a high energy density battery with the potential for thermal runaway. It runs brushless motors with electronic speed controllers switching current at high frequency. It has exposed connectors and arcing potential at every junction. Its electronics are not enclosed to any explosion protection concept. Its surfaces reach temperatures the classification may not permit. It accumulates static. And unlike fixed plant, it moves through the space, so an assessment made for one location does not hold for the flight path.
The practical consequence is blunt. Where a live process area is classified, a standard drone does not enter it, and the operational question is not how to fly carefully but whether certified equipment exists for that zone, or whether the area can be de-classified by isolation before the flight.
What Certification Actually Addresses
There is a certification route, and knowing its name is the fastest way to separate a supplier with equipment from a supplier with claims.
UL 6260 is the Outline of Investigation for Remotely-Operated Inspection and Maintenance Equipment for Hazardous (Classified) Locations. It is written for this exact category: remotely operated mobile inspection and maintenance robots, covering flying, crawling, tracked, wheeled, swimming and diving platforms, whether fully autonomous or under direct operator control.
What it evaluates: hazardous location compliance testing covering explosion protection, intrinsic safety and ingress protection ratings, with certification also able to include design and technical documentation review, functional safety where applicable, and reliability validation.
What it is for: Ex certification addresses the requirement that the robot does not become a potential ignition source. That is the whole question, stated plainly.
The international schemes: UL 6260 is the basis for North American certification. IECEx is the voluntary international scheme, and ATEX, under Directive 2014/34/EU, is a legal requirement for equipment placed on the EU market. Both rest on the same IEC 60079 technical standards, so a certificate under one generally supports an application under the other.
The commissioning consequence: uncertified robots may require a hot work permit for commissioning, which brings delay and expense before any inspection value is delivered.
That final point is the one to raise with a supplier early, because it reframes the commercial comparison. A certified unit costs more to buy or hire. An uncertified unit may arrive on site and require the permit regime associated with hot work before it can be commissioned at all, which can cost more in schedule than the equipment difference ever saved.
Ask which zone the certificate covers and under which scheme. “Suitable for hazardous environments” is a sentence anyone can write, and it is not a certificate.
The Conversation Before the Flight
Even with certified equipment, a flight into a live area is a permitted activity rather than an inspection task, and the preparation determines whether it happens at all.
The isolation option is worth taking seriously rather than treating as a failure of the drone proposition. Where a section can be isolated, purged and gas-freed, the classification changes for that period and standard equipment may become acceptable. That is a different conversation with operations, held earlier, and it often produces a better answer than a search for certified aircraft.
The loss of control case deserves equal weight because it is the scenario most likely to be waved through. A drone descending uncommanded onto live plant is a different event from the same failure over open ground, and the people who need to agree the answer are the ones who run the facility, not the ones flying.
Where This Leaves an Operator
For most Malaysian offshore and onshore facilities, the realistic position is that classified live areas are either flown with certified equipment under permit, or they are not flown while live. Both are legitimate answers, and the second is often the right one commercially once the permit burden of the first is costed honestly.
What is not a legitimate answer is a standard aircraft, flown carefully, in a classified area, on the basis that nothing has gone wrong before. The classification exists because the atmosphere is present often enough to be planned around, and the equipment either excludes ignition by design or it does not.
Operators building this capability should establish the certification question before investing, since it determines which work is addressable. Our drone training services cover the operational and regulatory framework that sits around this work, and equipment certification attaches to the aircraft and the scheme it was certified under rather than to any operator.
Frequently Asked Questions
What do hazardous area zones mean?
They classify how often an explosive atmosphere is expected rather than how severe an incident would be. Under IEC 60079-10-1, Zone 0 is where an explosive gas atmosphere is present continuously, for long periods or frequently; Zone 1 where it is likely occasionally in normal operation; Zone 2 where it is not likely and would persist only briefly. Combustible dusts follow the same logic as Zones 20, 21 and 22 under IEC 60079-10-2.
Why can’t a standard drone fly in a live process area?
Because it is an ignition source in several ways at once: a high energy density battery with thermal runaway potential, motors and speed controllers switching current, exposed connectors with arcing potential, electronics not enclosed to any explosion protection concept, surface temperatures, and static accumulation. It also moves through the space, so an assessment for one location does not cover the flight path.
What certification should I ask a supplier for?
Ask which zone the equipment is certified for and under which scheme. UL 6260 is the Outline of Investigation for Remotely-Operated Inspection and Maintenance Equipment for Hazardous (Classified) Locations and is the basis for North American certification; IECEx is the international voluntary scheme and ATEX is a legal requirement for equipment placed on the EU market. All rest on the IEC 60079 standards. Ex certification exists to establish that the equipment does not become a potential ignition source.
Is it cheaper to use an uncertified drone?
Not necessarily. Uncertified robots may require a hot work permit for commissioning, which brings delay and expense before any inspection is delivered. Once that permit burden is costed, certified equipment or an isolation-based approach frequently compares better than the purchase price suggests.
Sources: IEC 60079-10-1, classification of areas for explosive gas atmospheres, defining Zones 0, 1 and 2, and IEC 60079-10-2, classification of areas for explosive dust atmospheres, defining Zones 20, 21 and 22 · UL Solutions, UL 6260, Outline of Investigation for Remotely-Operated Inspection and Maintenance Equipment for Hazardous (Classified) Locations, covering flying, crawling, tracked, wheeled, swimming and diving platforms, evaluating explosion protection, intrinsic safety and ingress protection, with design and documentation review, functional safety and reliability validation, and addressing the requirement that the equipment does not become a potential ignition source · ATEX Directive 2014/34/EU as a legal requirement for equipment placed on the EU market, and the IECEx scheme as the voluntary international route, both resting on the IEC 60079 series
MarineCraft Journal
Get the next briefing in your inbox
Safety protocols, offshore training, regulation and market analysis, written for Malaysia’s maritime and offshore industry. No sales pitches.
We use your address only to send MarineCraft Journal. Unsubscribe any time. See our Privacy Policy.