Can you supply the fans across the whole chemical plant, or only one duty?
Across the whole plant. We have delivered 908 chemical & petrochemical fans spanning fired-heater and process-boiler forced and induced draught, corrosive gas exhaust from reactors and vents, hazardous-area and solvent exhaust, FGD and wet-scrubber boosters, hot-gas (>300 °C) process fans, general and dilution ventilation, process- and combustion-air blowers, and dirty-side dust extraction. Each fan is engineered to its own gas chemistry, temperature and area classification — the clean fired-heater FD and the wet corrosive scrubber booster are different machines — but they come from one partner, on one engineering convention across the plant.
Our process gas is corrosive — acid vapour and chlorides. What metallurgy do you use?
We size the metallurgy to your gas analysis, not a default. On corrosive duty we select from Corten, 316L, or a higher alloy on the wetted surfaces, with coating or FRP-lining options where they suit the gas better. The right answer depends on your acid vapour, chloride content, moisture and temperature, so we choose the material and the corrosion allowance from your figures. Send us the gas analysis and the operating point and we specify the alloy on the GA drawing you sign off before we cut metal.
The area is classified hazardous. How do you build the fan for ATEX?
Where the area is classified we build the fan to an ATEX construction for the zone — non-sparking wheel-to-casing clearances and material pairing, a bonded and earthed rotor, and bearings kept outside the airstream and monitored, built spark-safe to the gas group and temperature class your area classification specifies, to keep internal surfaces below that stated temperature class. To be precise: ATEX Zone 2/22 is self-declared per 2014/34/EU (Category 3) — it is a self-declaration of conformity for the zone you specify, not a third-party certification, and we build to the equipment category your area classification calls for. Tell us the zone, gas group and temperature class and we engineer to it.
We have a wet FGD or scrubber booster at the acid dew point. What do you do?
The scrubber booster sees the most aggressive condensate in the plant — saturated gas at the acid dew point, typically 120 to 150 °C. We keep the casing wall above dew point with insulation and heat tracing, select corrosion-resistant metallurgy on the wetted surfaces (316L, Corten or higher alloys on request), and add drains at the low points so condensate has nowhere to sit. The dew-point margin and the alloy are sized to your SO₂/SO₃, chloride and moisture, so we engineer it to your gas, not a default.
Can you build to API 673 and match our existing fan's duty and footprint?
Yes on both. We design and build to API 673 for oil-and-gas and petrochemical duty as project-specific scope (allow 5 to 7 working days for the offer). And we reverse-engineer to an existing fan's duty point (flow, static pressure, gas temperature, density and chemistry), bearing centres, inlet/outlet orientation and foundation bolt pattern so the unit drops onto the existing base and ducting — whether it is a fired-heater FD, a corrosive exhaust, a scrubber booster or a process-air blower. Made to your installation, not a nearest-catalogue substitute. Send the old GA, the nameplate, the gas analysis 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 IS 4894 / ISO 5801 / AMCA 210 method on our 200 HP VFD test rig, and dynamically balanced to ISO 21940 G6.3 as standard (G2.5 / G1.0 on application). Fans above the rig's 200 HP are run at derated speed and scaled to the specified duty by the fan laws. Because the rig runs cold air, hot or process-gas operation is extrapolated by fan-law correction for density. To be precise: that in-house testing is to the IS 4894 / ISO 5801 / AMCA 210 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.
