Explosion-proof AC Installation & Safety Guide for Chemical Plants

Kai Zhang
Nov 2
2 min read

1. Pre-Installation: Designed for Extreme Environments

Precise Explosion Risk Assessment: We strictly follow GB 50058 standards to classify hazardous zones (Zone 0/1/2), identify gas types (IIA/IIB/IIC), and match the right explosion-proof level (e.g., Ex d IIC T4).For mixed environments involving both gas and dust, we recommend dual-certified models (Ex d e IIC T4 Gb + Ex tD A21 IP65).

Corrosion-Resistant Construction: Chemical plants often contain H₂S, Cl₂, and acidic or alkaline vapors. Our explosion-proof ACs feature 316L stainless-steel casings or epoxy-coated finishes to prevent oxidation. Key components such as copper tubes and evaporators are nickel-plated, and PVC condensate trays use a leak-proof design for long-term durability.

Adapted for Harsh Conditions

High-temperature zones: Reinforced cooling design, compressor temperature protection, and reliable performance up to 60 °C.
High-humidity zones: Dual drainage pumps prevent water buildup and electrical short circuits.

2. Installation Standards: Safety Comes First

Smart Location Planning: Maintain a minimum 3m horizontal distance from valves, pumps, and storage tanks. Avoid installing units in low-lying areas where flammable gases or liquids may accumulate.

Explosion-Proof Electrical Design: Cables are routed through galvanized steel conduits and flexible explosion-proof pipes. Wall penetrations are sealed with fire-resistant putty to ensure a gas-tight installation. A dedicated grounding system ensures resistance ≤ 2 Ω, isolated from the plant’s lightning protection network.

Coordinated Ventilation Design: Air outlets are positioned to avoid process heat zones, preventing compressor overload. Systems can be linked to gas detection alarms—automatically cutting power and activating exhaust fans if gas levels exceed safety limits.

3. Operation Management: Reliable Performance, All Year Round

Safe Start and Stop Procedures: Before start-up, both manual and system checks are performed to ensure a safe environment. During maintenance, a formal energy isolation permit process is applied with clear lockout and warning signage.

Dynamic Load Control

In summer, staggered operation reduces grid load and prevents voltage fluctuations.
In winter, preheating lubricating oil ensures smooth compressor starts and longer lifespan.

Intelligent Monitoring System: Explosion-proof temperature, humidity, and vibration sensors are integrated into the DCS for real-time monitoring and early warnings. All key parameters are recorded electronically for traceable performance tracking.

4. Maintenance: Preventive Care for Long-Term Safety

Anti-Corrosion Maintenance: Check condensate pH monthly (keep between 5–9). Apply silicone sealant quarterly to casing joints and bolts for enhanced corrosion protection.

Performance Verification: Every six months, test explosion-joint clearance (≤ 0.15 mm) and surface roughness (Ra ≤ 6.3 μm). Replace compressor refrigerant oil every 8,000 hours to prevent carbon buildup and overheating.