Can you supply the fans across the whole steel works, or only one duty?
Across the whole works. We have executed 66 iron & steel duties spanning sinter-plant ID, blast-furnace and burner combustion air, electric-arc-furnace and ladle fume extraction, reheating and heat-treatment furnace flue, dirty-side dust extraction on the casters and mills, quench and tempering air, gas recirculation, and the ESP or baghouse main fans. Each fan is engineered to its own gas, temperature, spark risk and dust load — the hot dirty sinter ID and the clean combustion-air blower are different machines — but they come from one partner, on one engineering convention across the plant.
What is the maximum gas temperature you handle on a sinter or reheating-furnace fan?
Continuous duty up to 600 °C across the envelope, with most sinter ID and reheat flue fans running 150 to 450 °C. Above about 350 °C we fit a shaft cooling disc to keep heat off the bearings, keep the bearings outside the airstream, and add expansion joints for the thermal growth (a 1 m shaft grows about 7 mm from cold to 600 °C). Refractory lining is attested to 600 °C for the hottest furnace duty. The fan is built for your stated gas temperature and excursion case, not a generic rating.
Mill scale and sinter grit are brutal. How do you protect the wheel and casing?
Iron-oxide mill scale and sinter grit are among the hardest and most angular in any fan duty, and sinter and mill loads run heavy, so we protect three ways sized to your loading. A rugged radial wheel that sheds scale and resists erosion; chrome-carbide hard-facing on the blade leading edges and high-wear zones; and bolted-in, replaceable wear plates and liners at the scroll throat and inlet with inspection and cleanout doors, so worn parts change out in place. The wear scope is replaceable, not welded in — which is what keeps the fan running a full campaign.
EAF and grinding fume carries live sparks. How do you handle the fire and explosion risk?
Melt-shop and grinding extraction is the most spark-prone fan duty in industry, and a glowing particle in a loaded casing is an ignition source, so we engineer the fan to shed it. Spark-resistant construction to AMCA 99 Type B where live sparks are present; abrasion-tolerant geometry and drop-out so glowing particles shed rather than lodge; and, where the fume classification calls for it, ATEX Zone 2/22 self-declared per 2014/34/EU (Category 3). To be precise, that ATEX status is a self-declaration of conformity, not a third-party certification. The right scope depends on your dust and spark loading, so we engineer it to your fume, not a default.
Can you build a replacement to match our existing steel-plant fan's duty and footprint?
Yes. We reverse-engineer to the existing duty point (flow, static pressure, gas temperature, density and dust load), bearing centres, inlet/outlet orientation and foundation bolt pattern so the unit drops onto the existing base and ducting — whether it is a sinter ID, an EAF fume fan, a combustion-air blower or an ESP main fan. Made to your installation, not a nearest-catalogue substitute. Send the old GA, the nameplate and a curve if you have one, and we match it.
Do you performance-test the fans, and what about AMCA, CE, ATEX and quality certification?
Every fan is performance-tested in-house to the AMCA 210 / ISO 5801 method on our 200 HP VFD test rig, and dynamically balanced to ISO 21940 G6.3 as standard (G2.5 / G1.0 on application). Because the rig runs cold air, hot furnace-gas operation is extrapolated by fan-law correction for density. To be precise: that in-house testing is to the AMCA 210 / ISO 5801 method, not AMCA-certified; CE is self-declared per 2006/42/EC and 2014/35/EU, and ATEX Zone 2/22 is self-declared per 2014/34/EU (Category 3) where the area classification calls for it — those are self-declarations of conformity, not third-party certifications. Our only third-party certification is ISO 9001:2015.
