A facility handling flammable liquids or combustible dust needs a hoist for routine lifting, and a standard industrial hoist simply isn't rated for that environment.
This is where explosion-proof hoists, or "Ex-rated" hoists, come in. This article covers what makes an environment hazardous, what explosion protection actually means, and what to check before selecting equipment for this kind of site.
What kind of hoist is safe to use in a facility with flammable materials?
One specifically rated for the hazardous area classification of that site, not simply a standard hoist used more carefully. Facilities handling flammable gases, vapours, mists, or combustible dusts are assessed under a hazardous area classification, most commonly based on the IEC 60079 series, which identifies zones where an explosive atmosphere could form and specifies the equipment protection needed for each zone.
In one sentence: an explosion-proof hoist is one designed and certified not to become an ignition source in a defined hazardous zone, and that certification only counts if it matches the zone the hoist actually works in.
Under the IEC system, gas and vapour areas are classed as Zone 0, 1 or 2, and dust areas as Zone 20, 21 or 22, with the lower number meaning an explosive atmosphere is present more often or for longer. The zone then determines what category of equipment is permitted in that area. A hoist rated for one zone isn't automatically appropriate for a more hazardous one.
Why does standard equipment pose a risk in these environments?
Standard electrical and mechanical equipment can generate sparks, static discharge, or surface heat during normal operation, any of which can act as an ignition source if flammable vapour or combustible dust is present. Where an explosive atmosphere can be present during normal operation, that risk exists every time the hoist runs, not only when something goes wrong. This is also why protection on an explosion-proof hoist extends beyond the electrics to mechanical parts, using materials and designs that reduce the risk of friction sparks from moving components.
In Singapore, the SCDF Fire Code requires electrical equipment in hazardous locations to be suitable for that location, with IEC 60079 among the referenced standards, and employers must also assess fire and explosion risks under workplace safety and health risk management requirements. This isn't an optional precaution, but a defined compliance requirement.
What should a business actually check before selecting a hazardous-area hoist?
Start with a proper hazardous area classification for the specific space the hoist will operate in, carried out by someone qualified to assess flammable material risk on that site. Then match the equipment to that classification, rather than choosing a hoist first and hoping it fits the environment.
It's also worth checking installation and maintenance practices, not just the hoist itself. A correctly rated hoist installed or maintained incorrectly can lose its protective rating entirely, which defeats the purpose of specifying it in the first place.
Is explosion-proof equipment more expensive to maintain long-term?
Generally, yes. Hazardous-area equipment often requires more specialised servicing, since maintenance work must preserve the protective rating rather than simply restore function. This is a real added cost of operating in a hazardous environment, not a reason to compromise on equipment specifications to save money.
Businesses in Singapore assessing lifting needs for hazardous environments can review Jenmon International's range of explosion-proof hoists, which covers electric wire rope, chain and belt hoists as well as manual chain hoists, as part of that planning process.
Frequently asked questions
Who is responsible for classifying a hazardous area on a site?
The business operating the site is responsible for ensuring it's done, and a qualified engineer or safety professional familiar with the site's specific flammable materials and processes typically carries out the classification, rather than operations staff determining it informally.
Can a hoist rated for one hazardous zone be used in a more severe zone?
No. Equipment rated for a lower-risk zone is not automatically suitable for a higher-risk zone, since the protection requirements differ between classifications.
Does explosion-proof equipment need more frequent inspection than standard equipment?
Often, yes. Explosion-protected electrical equipment is usually subject to its own inspection regime, such as the one set out in IEC 60079-17, in addition to normal hoist maintenance, because the protective features themselves need checking, not just the lifting function.
Can existing standard equipment be retrofitted to hazardous-area standards?
This is rarely straightforward and depends heavily on the original equipment's design, so a proper assessment against the required classification is necessary before assuming a retrofit is viable.
