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How to Choose Compliant Explosion-Proof Cranes for Refineries & Chemical Plants?
Introduction
In refineries and chemical plants, the risk of explosions due to flammable gases, vapors, or combustible dust is a constant threat. Standard cranes can ignite these hazardous substances through electrical sparks, static discharge, or overheating, leading to catastrophic accidents.
This is why explosion-proof cranes are mandatory in such environments. But how do you choose the right one? What certifications should you look for? And how can Dongqi Crane, a leading explosion-proof crane manufacturer, provide a safe, reliable, and cost-effective solution?
This guide covers: ✔ Key explosion risks in refineries & chemical plants ✔ International explosion-proof standards (ATEX, IECEx, NEC, GB 3836) ✔ How to select the right explosion-proof crane ✔ Dongqi Crane’s specialized solutions for hazardous environments
1. Why Do Refineries & Chemical Plants Need Explosion-Proof Cranes?
An unprotected crane in such environments can: ✔ Generate static electricity (from friction in hoists or trolleys) ✔ Overheat (due to high ambient temperatures) ✔ Corrode quickly (reducing lifespan and safety)
→ Solution: Only ATEX/IECEx-certified explosion-proof cranes can operate safely in these zones.
2. Key Explosion-Proof Standards for Cranes
2.1 ATEX Directive (EU) – Explosive Atmospheres
Applies to: EU and many international projects
Classification:
Zone 0/20 (Continuous explosive atmosphere)
Zone 1/21 (Likely to occur during normal operation)
Zone 2/22 (Unlikely but possible in abnormal conditions)
Required Protection Types:
Ex d (Flameproof Enclosure) – Contains explosions inside the motor
Ex e (Increased Safety) – Prevents sparks in electrical components
2.2 IECEx (International) – Global Compliance
Recognized in: Middle East, Asia, Australia
Similar to ATEX but with global acceptance
Key for refineries exporting products
2.3 NEC/CEC (North America) – Class I, Div 1/Div 2
Class I: Flammable gases/vapors
Division 1: Hazard present under normal operation
Division 2: Hazard only under abnormal conditions
2.4 GB 3836 (China Standard)
Widely used in Chinese refineries & chemical plants
Equivalent to ATEX but with local certification requirements
→ Dongqi Crane’s Advantage: Our cranes are multi-certified (ATEX, IECEx, GB 3836, NEC) for global compliance.
3. How to Choose the Right Explosion-Proof Crane?
3.1 Determine the Hazardous Zone Classification
Zone
Risk Level
Required Protection
Zone 0/20
Continuous hazard
Ex ia (Intrinsic Safety)
Zone 1/21
Frequent hazard
Ex d, Ex e, Ex p
Zone 2/22
Occasional hazard
Ex n, Ex ec
Example:
Refinery hydrocracking unit (Zone 1) → Ex d crane required
Chemical storage (Zone 2) → Ex e or Ex n crane sufficient
3.2 Material & Corrosion Resistance
Stainless steel (316L) – Best for corrosive environments (e.g., sulfuric acid exposure)
Special coatings (epoxy, zinc-aluminum) – Extends lifespan in humid/salty conditions
3.3 Motor & Electrical Safety Features
✔ Explosion-proof motors (Ex d/Ex e rated) ✔ Anti-static brakes & wheels ✔ Sealed wiring (IP66 rating for dust/water resistance)
3.4 Smart Monitoring Systems (Optional)
Temperature sensors – Prevent overheating
Gas detectors – Alert if flammable gas levels rise
Remote diagnostics – Predictive maintenance to avoid failures
4. Dongqi Crane’s Explosion-Proof Solutions for Refineries & Chemical Plants
At Dongqi Crane, we specialize in manufacturing high-safety, high-performance explosion-proof cranes designed specifically for refineries, petrochemical plants, and chemical processing facilities. Our cranes are engineered to operate reliably in Zone 1, Zone 2, and Division 1/Division 2 hazardous areas, ensuring compliance with ATEX, IECEx, NEC, and GB 3836 standards.
Below, we detail our product range, key safety features, customization options, and real-world applications in hazardous environments.
4.1 Our Explosion-Proof Crane Product Range
Dongqi Crane offers three main types of explosion-proof cranes, each optimized for different lifting needs in hazardous areas:
✅ 1. Explosion-Proof Overhead Cranes (Ex d, Ex e, Ex n)
Best for: Indoor/outdoor lifting in refineries, chemical plants, and storage areas
Capacity: 1 ton to 100+ tons
Key Features:
Ex d (Flameproof) motors & electrical components – Contain sparks inside explosion-proof enclosures
Stainless steel or coated construction – Resistant to corrosive chemicals, saltwater, and high humidity
Anti-static trolley & hoist system – Prevents static buildup when handling flammable liquids/gases
IP65/IP66 protection – Sealed against dust and water ingress
✅ 2. Explosion-Proof Gantry Cranes (Ex de IIC T4)
Best for: Outdoor tank farms, loading/unloading areas
Capacity: 5 tons to 50 tons
Key Features:
Galvanized or stainless steel structure – Long-term durability in harsh weather
Explosion-proof limit switches & control panel – Safe operation in gas-rich environments
Custom span & height – Adaptable to different refinery layouts
✅ 3. Explosion-Proof Jib Cranes (Ex nA, Ex ec)
Best for: Localized lifting in confined spaces (e.g., reactor maintenance, pipeline installation)
Capacity: 0.5 ton to 10 tons
Key Features:
Compact, maneuverable design – Ideal for tight workspaces
Non-sparking aluminum or bronze components – Eliminates ignition risks
360° rotation – Flexible material handling
4.2 Key Safety & Performance Features
Dongqi’s explosion-proof cranes are built with multiple layers of protection to ensure maximum safety and uptime:
✔ 1. Explosion-Proof Electrical System
Motors, brakes, and wiring are Ex d/Ex e certified to prevent sparks
Sealed cable glands prevent gas/dust penetration
✔ 2. Corrosion-Resistant Materials
316L stainless steel (for highly corrosive zones)
Epoxy-coated carbon steel (cost-effective for moderate environments)
✔ 3. Advanced Safety Controls
Overload protection – Prevents crane failure due to excess weight
Emergency stop (E-stop) button – Instant shutdown in case of danger
Gas detection integration (optional) – Alerts operators if flammable gas levels rise
✔ 4. Smart Monitoring & Predictive Maintenance
Real-time temperature sensors – Prevent overheating in motors
Remote diagnostics – Reduces unplanned downtime
Automated lubrication system (optional) – Extends component lifespan
4.3 Customization for Refinery & Chemical Plant Needs
Every facility has unique requirements. Dongqi Crane provides tailored solutions based on:
🔹 Hazardous Zone Classification (Zone 1, Zone 2, Division 1, etc.) 🔹 Chemical Exposure (acid-resistant, anti-corrosion coatings) 🔹 Lifting Capacity & Span (custom-designed for heavy-duty refinery equipment) 🔹 Automation Level (remote control, IoT integration)
Example Customization:
A Middle Eastern refinery needed Ex d cranes with stainless steel hoists for hydrogen sulfide (H₂S) resistance.
We provided 10-ton overhead cranes with Ex d motors, IP66 protection, and anti-static trolleys – zero incidents in 5+ years.
4.4 Case Studies: Dongqi Cranes in Action
📌 Case 1: Explosion-Proof Cranes for a Chinese Petrochemical Plant
