Explosion-Proof Mechanical Bar Screen ATEX Certified Zone 1 Zone 2 SS316L

The Explosion-Proof Mechanical Bar Screen is a fully ATEX-certified wastewater screening solution purpose-engineered for operation in hazardous areas classified as Zone 1 (Gas Group IIB, Temperature Class T4) and Zone 2 where flammable gases, vapors, or combustible dusts may be present. This specialized equipment is critical infrastructure for petrochemical refineries, offshore oil and gas platforms, chemical processing plants, solvent recovery facilities, and any industrial wastewater treatment installation located within classified hazardous zones. Every component from the drive motor to the limit switches, junction boxes, cable glands, and the control panel enclosure has been selected, certified, and documented for compliance with the ATEX Directive 2014/34/EU, with the complete assembly covered by a Notified Body-issued EU-Type Examination Certificate.

Beyond its explosion-proof electrical certification, this bar screen incorporates multiple mechanical safety features specifically designed for hazardous area operation. All rotating and sliding components in potential spark-generating locations are fabricated from spark-resistant materials: bronze alloy rake guide shoes, copper-beryllium scraper tips on the cleaning mechanism, and stainless steel chain links with PTFE-impregnated bushings that require no lubrication and generate no frictional sparks even under dry-running conditions. The main frame and all wetted components are constructed from SS316L stainless steel to withstand the aggressive chemical environments typical of petrochemical wastewater, which often contains hydrocarbons, hydrogen sulfide, mercaptans, and acidic compounds at concentrations that would rapidly corrode standard materials.

• Full ATEX Certification: EU-Type Examination Certificate covering the complete bar screen assembly for Zone 1 (II 2G Ex db IIB T4 Gb) and Zone 2 (II 3G Ex ec IIB T4 Gc) hazardous areas, with optional IECEx certification for international projects.
• Explosion-Proof Drive System: Flameproof (Ex d) motor with ATEX-certified gear reducer, supplied through Ex e increased-safety terminal box with certified double-compression cable glands, rated for continuous duty in gas group IIB environments.
• Spark-Resistant Mechanical Design: Bronze alloy guide shoes, CuBe scraper tips, and self-lubricating PTFE-impregnated chain bushings eliminate all potential sources of mechanically generated sparks during normal and foreseeable abnormal operation.
• Intrinsically Safe Instrumentation: All proximity sensors, limit switches, and level transmitters are ATEX-certified intrinsically safe (Ex ia) devices connected through galvanic isolators in the safe-area control panel.
• Full SS316L Metallurgy: Complete construction in SS316L including frame, bars, fasteners, and weld filler metal provides resistance to hydrogen sulfide stress cracking, chloride pitting, and acidic corrosion common in refinery and chemical plant wastewater.
• Remote Control Panel Placement: The PLC control cabinet is designed for installation in the safe area (control room or non-classified zone) at distances up to 500 meters, with all field wiring through armored Ex-approved cable.

The Explosion-Proof Bar Screen is essential infrastructure for oil refinery API separator inlet channels where the wastewater surface may carry a flammable hydrocarbon layer, requiring all electrical equipment within the classified zone to be explosion-proof. Offshore production platforms use this screen in produced water treatment systems where dissolved gas carryover creates a Zone 1 environment on the treatment deck. Petrochemical plants producing ethylene, propylene, aromatics, and solvents require ATEX-certified screening in their process water and stormwater runoff treatment systems. Tank farm and fuel storage terminal drainage treatment facilities depend on explosion-proof screens to safely handle rainwater runoff that may contain floating product. Chemical manufacturing facilities handling volatile organic compounds, alcohols, and ketones use this equipment in their effluent pretreatment channels where vapor concentrations can reach the lower explosive limit.

Each Explosion-Proof Bar Screen undergoes a rigorous factory acceptance test that includes complete functional testing of all ATEX-certified components, insulation resistance testing of the Ex d motor, loop checking of all intrinsically safe circuits with the specified galvanic isolators, and a full-scale wet test to verify mechanical operation. The quality documentation package includes the EU-Type Examination Certificate, individual component ATEX certificates, material certificates for SS316L with PMI test reports, NDT reports for structural welds, motor test certificates, and intrinsically safe system descriptive documentation as required by IEC 60079-25. All equipment is packed in reinforced export crates with each ATEX-certified component individually wrapped in anti-static protective material. The standard warranty is 18 months from shipment. Factory-authorized hazardous area commissioning engineers are strongly recommended for on-site installation supervision and ATEX compliance verification.