During design and selection, the explosion-proof rating must be determined based on the zone classification, gas category, and temperature class of the explosive gas atmosphere. The FBD-400 flameproof explosion-proof electric heater adopts a flameproof enclosure design, suitable for Zone 1 and Zone 2 hazardous locations, and can match Group IIA, IIB, and IIC gas atmospheres. The enclosure protection rating is IP65, effectively isolating internal sparks from contact with external flammable and explosive gases. Temperature classes are typically selected from T1 to T6, and it must be ensured that the maximum surface temperature of the equipment does not exceed the ignition temperature of the gas in the surrounding environment.
Heating power and voltage must be calculated and determined based on the flow rate, specific heat capacity, and temperature rise requirements of the medium being heated. The FBD-400 supports customization according to specified power and voltage, and is compatible with AC 380V or 220V power supplies. During selection, the actual heat load should be calculated and a reasonable margin reserved to avoid long-term overload operation. The internal temperature of the junction box can be controlled within <65°C, <85°C, or <100°C as required, and the appropriate specification should be selected based on the on-site ambient temperature and medium characteristics.
This heater can be installed horizontally or vertically on pipelines, storage tanks, reactors, and other equipment. The installation location should be convenient for maintenance and away from areas where flammable materials accumulate. The heating tube material should be selected from stainless steel, carbon steel, or alloy materials based on the corrosiveness of the medium. For heat transfer media such as thermal oil, attention should be paid to flow velocity and heat flux density on the heat exchange surface to prevent local overheating that could cause medium cracking. Electrical wiring must be performed by professionals and reliably grounded.
The FBD-400 explosion-proof electric heater is commonly used in process heating applications involving flammable and explosive gases in petroleum, chemical, pharmaceutical, and other industries, such as pipeline heat tracing, storage tank insulation, and reactor heating. Routine maintenance should include regular inspection of the flameproof surface for damage, checking whether fasteners are loose, and cleaning scale from the heating tube surface. During shutdown maintenance, the power supply must be cut off and the enclosure confirmed to be cooled before opening the junction box.
