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Crane TypeEx-Proof (Explosion-Protected) Crane
In an atmosphere with flammable gas, vapour or dust, this isn't a preference — it's a compliance requirement.
What it covers
The goal of Ex-proof design is for the equipment not to create a spark or a hot surface capable of igniting the explosive atmosphere. This goes beyond electrical components — rubbing metal surfaces, static-electricity buildup and brake heating are all assessed too.
That's why an Ex-proof crane isn't a standard crane with swapped-out components — it's a different machine, designed from the ground up for that environment.
Zone classification
The starting point for the design is the zone classification of the area the crane will operate in: how often and for how long the explosive atmosphere is present. This is accompanied by the group and ignition temperature of the gas or dust involved.
This information is found in the facility's explosion-protection document. An Ex-proof crane can't be designed without it — there's no way to determine the required protection level.
Typical applications
| Area | Typical requirement |
|---|---|
| Petrochemical and refining | Ex-proof design for a gas atmosphere |
| Paint and solvent facilities | Vapour atmosphere, static-electricity precautions |
| Flour, sugar, feed plants | Dust-Ex protection against dust-explosion risk |
| Pharmaceutical and chemical production | Protection level varies by process zone |
| Battery production | Hydrogen accumulation risk |
| Waste and biogas facilities | Methane atmosphere |
Technical terms
| Term | What it means |
|---|---|
| Zone | Area classification based on how often an explosive atmosphere is present. |
| Gas group | Classification of the gas present, based on its ignition characteristics. |
| Temperature class | The class defining the maximum surface temperature the equipment may reach. |
| Explosion-protection document | The document defining a facility's explosive-atmosphere risks and zones. |
Frequently asked questions
Can you convert my existing crane to Ex-proof?
Generally no. Protection is a matter of the whole design, not individual components; converting one is often more expensive than a new crane and can be problematic from a compliance standpoint.
Who determines the zone classification?
It's defined in the facility's explosion-protection document, prepared on the employer's behalf. Crane design is based on the information in that document.
Is an Ex-proof crane slower?
Not necessarily; but protection requirements can restrict some component choices. Speed and equipment expectations should be discussed up front.