During maintenance of heat transfer oil furnaces, asphalt tanks, or paraffin wax tanks, it is common to see a thick layer of coke attached to the surface of electric heating tubes, and even bulging or cracking of the tube body. Purchasing personnel report that similar heating elements typically need replacement every 3-6 months, resulting in high maintenance costs. The root cause is often not the power rating, but the matching of sheath material, surface load, and medium characteristics. The FJY-380 sheathed electric heater has been adjusted in structural design and material selection to address such phenomena.
Ordinary tubular electric heaters mainly consist of a single electric heating tube, with a relatively concentrated surface load. The FJY-380 sheathed electric heater uses multiple electric heating tubes combined into one heating body, with a nickel-chromium alloy heating wire covered by a high-purity magnesium oxide insulation layer, and the outermost layer is a metal sheath. By dispersing the surface load, the peak temperature at a single point is reduced, and coking caused by local overheating is minimized. Compared with single-tube solutions of the same power, when heating easily coking media such as heat transfer oil and asphalt, the carbon accumulation rate is somewhat slowed.
Before requesting quotations, purchasing personnel can confirm requirements against the following parameters: voltage is 380V star connection, and can also be customized as 220V with three terminals on each side; power range is 1KW-10KW, and non-standard power can be negotiated for ordering. Flange outer diameter is 115mm, thickness 8-10mm, 6 mounting holes, hole diameter 9mm, center distance 94mm. The length of the electric heating tube is determined according to the actual installation space. Compared with flange-type and threaded-type installed heaters, this structure is easy to disassemble and assemble as a whole, suitable for occasions requiring regular core-pulling maintenance.
When melting light metals or solid media such as nitrate salts, alkalis, asphalt, and paraffin, ordinary heaters started directly at full voltage can easily cause thermal shock to the sheath. The FJY-380 sheathed electric heater recommends reduced-voltage starting, and after the solid medium is completely melted, then raise to rated voltage, which can extend service life. Compared with direct immersion heaters, this product offers better controllability during the medium melting stage, reducing the risk of sheath cracking caused by rapid cooling and heating. Purchasing personnel can incorporate this operational requirement into equipment operating procedures.
This model is suitable for industrial occasions requiring heating of liquid or molten media, such as heat transfer oil heating systems, asphalt storage tanks, paraffin melting tanks, and nitrate salt furnaces. During installation, ensure that the heating body is fully immersed in the medium to avoid dry burning. Compared with conventional electric heating coils and electric heating plates, sheathed electric heaters focus more on overall heating and insulation of the medium inside the container. Purchasing personnel should select the sheath material according to the corrosiveness of the medium, and calculate the power margin based on volume and heating time.
