Explosion-Proof Overhead Cranes Lineup for Hazardous Areas (LB / LXB / LHB / QB / QBE / Clean EX)
In hazardous plants where flammable gases, vapors or combustible dust may occur, material handling must control ignition risks. Our explosion-proof overhead crane lineup provides engineered options from compact single-girder systems to heavy-duty open-winch process cranes—configured to your area classification (gas or dust), duty profile, and building geometry.
Important note: Final selection follows your site’s hazardous area classification and project specification. We do not state certificates we don’t possess; component protection concepts and documentation are listed in proposals upon request.
1) LB — Explosion Proof Single Girder Overhead Crane
Best for: general bay lifting in hazardous gas or dust areas with limited headroom and moderate duty.
Key features
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Compact low-headroom hoist trolley to maximize hook height
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EX motors, brakes, limit switches, enclosures; grounded/bonded structure
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Smooth starts/stops via VFD; optional creep speed and anti-sway logic
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Pendant or EX-ready radio control (per site rules)
Typical working ranges (indicative)
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Capacity: 1–20 t Span: 5–22 m Lift: 6–24 m
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Duty: medium (e.g., regular production & maintenance)
Typical applications: solvent handling, paint shops, skids and pumps, drum transfer.
2) LXB — Explosion-Proof Single-Girder Underslung Crane
Best for: congested bays or buildings without room for top-running runways.
Key features
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Suspension/underslung running on the lower flange of runway beams
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Tight approach dimensions, excellent area coverage on complex bays
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EX electricals and anti-spark measures identical to LB
Typical working ranges
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Capacity: 0.5–10 t Span: 3–16 m Lift: 6–18 m
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Duty: light–medium
Typical applications: packaging lines, assembly cells, battery rooms with crowded pipe racks.
3) LHB — Explosion-Proof Double-Girder (Hoist) Overhead Crane
Best for: higher capacities and longer spans while keeping hoist-based architecture.
Key features
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Double-girder bridge with EX wire-rope hoist trolley
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Higher hook approach, service walkway options, maintenance access
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VFD travel on trolley/bridge; load display, inching, and zoning interlocks optional
Typical working ranges
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Capacity: 10–50 t Span: 10–30+ m Lift: 8–30 m
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Duty: medium–heavy (frequent starts, longer travel)
Typical applications: reactors, mixers, filter presses, tank farms.
4) QB — Explosion-Proof Open-Winch Double-Girder Overhead Crane
Best for: process duty, heavy loads, high precision positioning, and higher thermal margins.
Key features
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Open-winch hoisting with robust gear/motor/brake assemblies
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Tailored speed profiles (hoist/trolley/bridge), multi-level protections
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Thermal management for drives/resistors; guided cabling & EX glands
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Optional operator cabin, maintenance platforms, redundant brakes
Typical working ranges
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Capacity: 20–200+ t Span: 12–35 m Lift: 12–30 m
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Duty: heavy–severe (continuous or near-continuous process use)
Typical applications: petrochemical reactors, large mold handling, LNG/energy modules.
5) QBE — Explosion-Proof Double-Trolley, Double-Girder Crane
Best for: synchronized lifts, turning/tilting, balanced handling of long or awkward loads.
Key features
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Two trolleys with synchronized control for tandem or turning operations
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Coordinated VFD and interlocks; optional load-sharing & anti-skew logic
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Same EX electrical philosophy as QB, with added synchronization safety
Typical working ranges
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Capacity (each trolley): 10–80 t (project-specific)
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Span / Lift: as engineered to application
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Duty: heavy (precision process moves)
Typical applications: pressure vessels, long shafts, molds, tank assemblies.
6) Clean Explosion-Proof Overhead Cranes
Best for: hazardous and cleanliness-controlled environments such as batteries, pharma, specialty chemicals.
Key features
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Clean-area friendly finishes, sealed enclosures, dust-tight cable management
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Low-particle design on walkways and housings; stainless hardware where needed
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EX electricals and grounding per area classification; optional positive-pressure panels where specified
Typical working ranges
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Capacity: 0.5–20 t (single-girder), 10–50 t (double-girder)
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Span / Lift: per bay layout Duty: light–medium–heavy (as specified)
Typical applications: NMP/electrolyte rooms, coating/drying lines, ethanol-based pharma rooms.
Engineering Essentials for All EX Models
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Explosion-protected electricals: hoist/bridge motors, brakes, limiters, junction boxes, pushbutton stations; enclosure/gland selection for gas or dust atmospheres.
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Controls & safety: VFD with safe-stop logic, overload/overspeed monitoring, travel limits; intrinsically safer low-energy circuits where applicable.
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Anti-spark & static control: full-path grounding/bonding, anti-static cable systems, guarded rubbing interfaces; non-sparking contact materials where required by spec.
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Thermal management: component layout and cooling to keep surface temperatures within the project’s T-rating under worst-case duty.
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Mechanical integrity: duty-appropriate motors/gearing, smooth acceleration to reduce swing; optional anti-sway and inching modes.
Quick Comparison (at a glance)
| Model | Bridge Type | Hoist Type | Typical Capacity | Bay Fit | Best For |
|---|---|---|---|---|---|
| LB | Single-girder, top-running | Low-headroom hoist | 1–20 t | Low headroom, general bays | Everyday EX lifting |
| LXB | Single-girder, underslung | Low-headroom hoist | 0.5–10 t | Crowded bays, no top runway | Dense layouts |
| LHB | Double-girder, top-running | Wire-rope hoist | 10–50 t | Long spans, higher hook | Higher capacity with hoist |
| QB | Double-girder, top-running | Open-winch | 20–200+ t | Process duty | Heavy/continuous service |
| QBE | Double-girder, top-running | Dual trolleys | 2×10–2×80 t | Project-specific | Synchronized lifts/turning |
| Clean EX | Single/Double | Hoist-based | 0.5–50 t | Clean + hazardous | Battery/pharma/chemicals |
Figures are indicative for early budgeting. Final values follow engineering and classification.
How to Specify (send this with your RFQ)
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Area classification: gas/dust, zone, group, temperature class (T-rating)
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Load data: capacity, load spectrum, starts/hour, duty hours
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Geometry: span, hook path, approaches, building clearances, runway data
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Speeds & control: hoist/trolley/bridge speeds, creep/anti-sway, pendant vs EX-radio
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Power & cabling: voltage/frequency, conductor bar vs festoon, EX glands/seals
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Environment: ambient temp/humidity, indoor/outdoor, corrosion category
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Documentation: drawings, datasheets, O&M manuals, FAT/SAT scope; third-party inspection if required
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Site conditions: installation access, test loads, acceptance requirements
Safety, Commissioning & Maintenance
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Installation: follow hazardous area cable routing, sealing, spacing; verify equipotential bonding across bridge/trolley/runway.
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Commissioning: function & overload tests, limit devices verification, temperature checks under representative duty.
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Maintenance: periodic inspection of brakes, ropes/chains, hooks, enclosures and glands; recordkeeping and timely replacement of wear parts.
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Change control: any modification to controls or devices must be reviewed for hazardous area impact.
Ready to specify?
Share your environment (dust/heat/cold/corrosion), duty class, bay height, span, and tooling (grab/magnet). We’ll return a risk-reduced package + drawings + a service plan.
Expert in Overhead Crane/Gantry Crane/Jib Crane/Crane Parts Solutions
Eileen
With 20+ years of experience in the Crane Overseas Export Industry, helped 10,000+ customers with their pre-sales questions and concerns, if you have any related needs, please feel free to contact me!
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