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CNWINNEX Pressurized Explosion-Proof Maintenance HabitatThe CNWINNEX Pressurized Explosion-proof Maintenance Habitat is a relocatable, positive-pressure explosion-proof working space built for on-site maintenance, hot work and equipment servicing in explosive hazardous areas. The main frame is assembled from industrial heavy-duty aluminium profiles, with flame-retardant shelter panels forming the surrounding walls. The habitat is of overall pressurized explosion-proof construction, with a separate access door and buffer room as well as an emergency escape door and observation windows. Outside the shelter, two sets of explosion-proof pressurized fresh-air blower systems connect to an external pressurized fresh-air source, creating a clean working environment that continuously maintains positive pressure inside the hazardous area.
200kW CNWINNEX Positive-Pressure (pxb) Explosion-Proof Resistive Load Bank · ATEX CertifiedThe CNWINNEX 200KW positive-pressure explosion-proof load bank is a canopy-type resistive load testing unit built around positive-pressure (pxb) explosion protection. Rated at 400Vac, 50Hz, three-phase four-wire (3P4W) with a power factor of 1.0, the unit achieves 1kW fine staging through 10 resistive load stages. Weighing only 220kg and fitted with 4 heavy-duty castors, it can be relocated and deployed flexibly in equipment rooms, workshops and outdoor sites, making it an ideal load verification tool for 200kW-class generator sets, UPS systems, energy storage systems and data centre equipment in hazardous areas.- Pressurized Explosion-proof Resistive Load Bank 500KWThe CNWINNEX 500KW Pressurized explosion-proof load bank is a high-power resistive load testing unit designed specifically for explosive hazardous areas. Rated at 400Vac, 50Hz, three-phase four-wire (3P4W) with a power factor of 1.0, it delivers high-precision and repeatable on-load testing for generator sets, UPS systems, power grids and energy storage systems. Built with a containerized structure and side-discharge airflow design, and equipped with a Siemens SIMATIC S7-200 SMART PLC and HMI touch screen, the unit supports both local and remote (Modbus TCP) control modes, combining industrial-grade durability with flexible deployment.
CNWINNEX BT35-11-11.2 Explosion-Proof Stainless Steel Axial Fan: 67,892 m³/h High-Volume Airflow for Centralized Ventilation Power in Large Hazardous SpacesIn large refinery process areas, hazardous-material storage warehouses, and onshore terminals of offshore platforms, the central contradiction in ventilation systems is often not whether explosion-proof certification exists, but whether sufficient air volume can be moved through the hazardous area per unit of time. When spatial scale rises to thousands of square meters, ceiling heights exceed ten meters, or duct routes cross multiple fire compartments, the air-change rate that conventional small and medium fan sizes achieve only through multiple parallel units can be delivered by a single high-volume unit—reducing installation nodes, and with them, the explosion-proof interfaces and maintenance touchpoints at every node.
CNWINNEX BT35-11-6.3 Explosion-Proof Stainless Steel Axial Fan: 18,250 m³/h Medium-High Airflow for Reliable Ventilation Boundaries in Corrosive Hazardous WorkshopsIn the routine ventilation design of chemical workshops, hazardous-material warehouses, and oil and gas stations, equipment selection often faces an implicit contradiction: explosion-proof compliance answers whether a fan can be used at all, but the corrosion degradation of impellers and casings in carbon steel or aluminum alloy units under humid, mildly corrosive, or sulfur-bearing atmospheres steadily erodes the boundary of how long it remains usable. A fan that runs safely in a Zone 1 area for three years may still require premature replacement because pitting on the blades throws off dynamic balance and reduces airflow—a problem that explosion-proof certification alone does not address, but that material and process engineering must answer.
The CNWINNEX BT35-11-6.3 Explosion-Proof Stainless Steel Axial Fan is designed for precisely this contradiction: stainless steel casing and impeller confront corrosive gases and humid environments, ATEX Directive 2014/34/EU and EN 60079 series
CNWINNEX BT35-11-3.15 Explosion-Proof Stainless Steel Axial Fan: ATEX-Compliant High-Efficiency, Low-Noise VentilationIn the explosive hazardous areas of petrochemical plants, oil and gas stations, hazardous-material storage facilities, and offshore platforms, ventilation equipment is not merely a process accessory—it is a foundational line of defense for the working environment. Conventional fans often struggle to reconcile material durability with explosion-proof reliability when faced with high salt spray, corrosive gases, and explosive atmospheres. The CNWINNEX BT35-11-3.15 Explosion-Proof Stainless Steel Axial Fan is engineered precisely for the ventilation demands of Zone 1 and Zone 2 high-risk environments. The product addresses corrosion challenges through stainless steel construction, establishes its explosion-proof baseline on ATEX and EN 60079 series standards, and balances 3,076 m³/h airflow with low-noise operation within a compact frame.- CNWINNEX Explosion-Proof Compressor: Full Coverage of 9 Refrigerants and Precise Pressure Control for Uncompromised Safety BoundariesIn hazardous-area explosion-proof refrigeration systems, refrigerant selection is often dictated by a project's regional environmental regulations, thermal control requirements, and system design. As the "heart" of the system, a compressor's ability to be compatible with multiple refrigerants while maintaining absolute safety control under various pressure conditions is a key indicator of engineering maturity in explosion-proof equipment.
CNWINNEX EX-ART2 2-Cylinder Explosion-Proof Compressor: Compact Architecture and Robust Parameters for Precise Cooling in Confined Hazardous SpacesIn offshore platform analyzer rooms, small explosion-proof control cabins, or space-constrained electrical equipment rooms, explosion-proof HVAC equipment faces strict physical size limits and exceptionally high safety compliance requirements. As China’s only independently IECEx-certified explosion-proof compressor company, CNWINNEX’s affiliated company introduces the EX-ART2 series 2-cylinder explosion-proof compressors—engineered specifically for these "space-premium and high-risk" working conditions.
Centered on static positive-pressure protection (pxb) and integrated with an increased-safety junction box and intrinsically safe protection components, the series carries the marking Ex eb ib mb pxb IIC T4 Gb. Through a compact 2-cylinder structure and two size matrices, it provides a solid, compliant refrigeration heart for cooling capacity requirements ranging from 3.39kW to 11.2kW.
CNWINNEX Pressurized Explosion-Proof Maintenance Habitat
Product Overview
The CNWINNEX Pressurized Explosion-proof Maintenance Habitat is a relocatable, positive-pressure explosion-proof working space built for on-site maintenance, hot work and equipment servicing in explosive hazardous areas. The main frame is assembled from industrial heavy-duty aluminium profiles, with flame-retardant shelter panels forming the surrounding walls. The habitat is of overall pressurized explosion-proof construction, with a separate access door and buffer room as well as an emergency escape door and observation windows. Outside the shelter, two sets of explosion-proof pressurized fresh-air blower systems connect to an external pressurized fresh-air source, creating a clean working environment that continuously maintains positive pressure inside the hazardous area.
The product carries explosion-proof markings Ex pxb IIC T4 Gb for explosive gas atmospheres and Ex pxb IIIC T135℃ Db for combustible dust atmospheres, and is designed and manufactured in compliance with ATEX Directive 2014/34/EU and the EN 60079 series. Overall ATEX certification for the complete unit can be applied for according to project requirements. Three sizes are available — Main, Public and Process — covering large integrated maintenance, centralized support and distributed workstations, and are widely applied in Zone 1/Zone 2 and Zone 21/Zone 22 hazardous areas in oil and gas, refining, chemical, oilfield and hazardous chemical storage facilities.
Core Advantages
Positive-pressure protection: isolating hazardous atmospheres with clean pressurized air
The principle of positive-pressure protection is to keep the working space out of direct contact with an explosive atmosphere. The pressurization air supply system continuously delivers filtered clean fresh air into the habitat so that internal pressure always remains above the surrounding environment, physically preventing hazardous gas or dust from entering. A pre-purge is performed before start-up to replace residual gas according to the set air volume. The pressure instrument detection unit, with a built-in differential pressure sensor and gauge, continuously collects pressurization parameters and uploads them to the PLC of the pressurization control system; if pressure falls below the set threshold, the system raises an alarm and cuts off the relevant power supply, keeping the habitat in a safe positive-pressure state.
Modular quick assembly: a working space that moves with the workstation
The frame uses industrial heavy-duty aluminium profiles of quick-assembly type with foot pads, diagonal braces and lifting points, allowing whole-unit lifting, transport and rapid on-site assembly. The enclosure is glass-silicone rubber flame-retardant flexible fabric, resistant to high temperature, anti-static, spark-free and flame-retardant Class B1, fitted with observation windows and an emergency escape door. Sealing strips, quick-action clamps and locking fasteners ensure airtightness, which is the precondition for maintaining positive pressure. The complete system can be quickly dismantled, relocated and reassembled when maintenance plans change, bringing the safe working space to wherever the work is.
Three-size matrix covering all on-site requirements
The Main Habitat (4000×3000×2500mm) serves large integrated maintenance and main work areas, equipped with the MDB main distribution cabinet, SUB distribution cabinet and a 200kVA three-phase dry-type transformer that converts on-site AC690V into AC400V three-phase power. The Public Habitat (3000×3000×2500mm) acts as a centralized support and distribution hub with an EDS distribution cabinet, integrating remote monitoring and air-conditioner remote-control signals from the process habitats. The Process Habitat (2000×2000×2500mm) serves distributed workstations and process operations, with quantity configurable to the number of workstations. All three sizes share the same pressurization, monitoring and electrical protection architecture for unified management and centralized maintenance.
Full-area gas monitoring and door interlock
Each habitat is equipped with 5 explosion-proof combustible gas detectors (1 inside, 3 outside and 1 at the pressurized air-source blower inlet) for CH4 concentration, 1 explosion-proof toxic gas detector for H2S and 1 explosion-proof temperature detector for ambient temperature inside the shelter. All detectors are Honeywell FGM7100 integrated units with displays, 4-20mA output and a reserved alarm relay signal to the pressurization PLC for audible and visual alarm. The explosion-proof door interlock switch continuously monitors the status of the inner door and sends the interlock signal to the PLC, linking door opening with the pressurization system to prevent work in a non-pressurized condition.
Complete ATEX explosion-proof electrical package
The pressurization control system uses a BXK51 cast aluminium alloy flameproof wall-mounted cabinet (Ex db IIB T6 Gb) that monitors pressurization status and gas alarms and controls purge start/stop of the booster fans. Explosion-proof axial fans BFT-30 (220V/50Hz), an explosion-proof air valve, a filter unit and a retractable air hose form an integrated air-source blower system. The package also includes increased-safety junction boxes (EJX, Ex eb IIC T6, one input and four outputs), explosion-proof LED lights (BAD-40W/60W, Ex d IIC T4), explosion-proof socket outlets (60A/4-core and 15A/3-core) and explosion-proof solenoid valves (3/8, DC24V, Ex d IIB T4). Main electrical components are from Schneider and Chint, and key equipment is supplied with ATEX certificates.
Integrated power and air supply, delivered turnkey
The system integrates pressurization air supply, gas monitoring, explosion-proof lighting, power distribution and cylinder gas circuits into one complete solution. The MDB main cabinet takes two on-site sources (AC400V generator and AC690V distribution room) through a 250A automatic dual-power changeover switch with under-voltage interlock trip protection. The SUB cabinet, with a 100A main breaker, outputs 12 branch circuits to the pressurization interlock control cabinets of 8 process habitats and 4 maintenance socket circuits, with leakage protection. The EDS cabinet, with a 160A main breaker, outputs 4 x 63A welder circuits and 2 x 32A air-conditioner circuits. On the gas side, 40L cylinders (with storage cages) and explosion-proof solenoid valves enable remote automatic cylinder valve operation, with PVC hoses connecting each process habitat. On site, only power and air need to be connected before the system is ready for use.
Three-Size Comparison
Table 1 Comparison of the three CNWINNEX Pressurized Explosion-proof Maintenance Habitat sizes
Core Configuration (per-unit standard)
Table 2 Core configuration of the CNWINNEX Pressurized Explosion-proof Maintenance Habitat
Applications
The product is widely used in oil and gas production and processing plants, refining and petrochemical units, oilfield well pads, hazardous chemical storage and offshore/coastal industrial facilities where explosive gas or combustible dust hazards exist. It provides a compliant and safe on-site working space for pipeline and pressure vessel maintenance, hot work and welding, instrument and electrical maintenance, and emergency repair.
Compared with fixed explosion-proof workshops, the pressurized maintenance habitat requires no civil construction investment and can be quickly relocated and reassembled with maintenance schedules, making it particularly suitable for multi-location, cyclical on-site maintenance. It helps owners shorten shutdown time and improve maintenance efficiency while meeting HSE requirements.
Contact Us
The CNWINNEX Pressurized Explosion-proof Maintenance Habitat provides a relocatable safe working space for on-site maintenance in hazardous areas through positive-pressure explosion protection, modular quick assembly, a three-size matrix and a complete ATEX explosion-proof electrical package. Contact the CNWINNEX engineering team for product selection, configuration planning and project customization. Website: www.cnwinnex.com; Email: info@cnwinnex.com.
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