Can you supply the fans across the whole plastics flowsheet, or only one duty?
Across the whole flowsheet. We have executed 14 plastics & polymer duties spanning resin and pellet drying, dilute-phase pneumatic conveying, extruder and process fume extraction, dirty-side dust collection, general and dilution ventilation, and corrosive off-gas vent. Each fan is engineered to its own air, temperature, dust and fume — the clean hot dryer fan and the fouling dust collector are different machines — but they come from one partner, on one engineering convention across the plant.
Our extrusion and drying fume condenses to a sticky film and fouls the wheel. How do you handle it?
That is the most common plastics fan complaint, and it is a dew-point and geometry problem. We hold the casing wall above the fume dew point (often 50 to 90 °C) with insulation and heat tracing so the plasticiser and oligomer vapour never condenses on the fan, choose a rugged radial wheel with wide self-shedding passages that resists caking, and fit access and washdown doors with a smooth non-stick casing finish so the wheel cleans down in place. The result is a fan that holds balance between planned cleandowns instead of caking out of balance in weeks.
Polymer fines are combustible. Is your fan ATEX and spark-resistant for that dust?
Yes, where the dust classification calls for it. Granulator, grinder and dryer fines from PE, PP, ABS and PET are a combustible dust (Kst up to about 200 bar-m/s, class ST1/ST2), so we build spark-resistant construction to the AMCA classes — non-sparking rubbing surfaces, generous rotor-to-casing clearance, a fully bonded and earthed assembly and bearings kept outside and temperature-monitored. ATEX Zone 2/22, Category 3 is self-declared per 2014/34/EU for the classified area. To be precise, that ATEX marking is a self-declaration of conformity, not a third-party certification. Tell us your dust test data (Kst, MIE, class) and we build to it.
We process PVC and see acid off-gas. What metallurgy do you use on the vent fan?
PVC and any thermal degradation release HCl and acidic vapour that condenses acid below the dew point and pits carbon steel. We size the metallurgy and the dew-point margin to your off-gas analysis: 316L or an FRP-lined wetted surface on the acid vent, insulation and heat tracing to hold the wall above the acid dew point, and blade and casing geometry so condensate drains rather than pools on the wheel. The right answer depends on your HCl content and moisture, so we engineer it to your gas, not a default.
Can you build a replacement to match our existing plastics fan's duty and footprint?
Yes. We reverse-engineer to the existing duty point (flow, static pressure, air temperature, density and dust or fume load), bearing centres, inlet/outlet orientation and foundation bolt pattern so the unit drops onto the existing base and ducting — whether it is a dryer fan, a conveying blower, a fume extractor or a dust collector. 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). To be precise: that in-house testing is to the AMCA 210 / ISO 5801 method, not AMCA-certified, and we are not an AMCA member; 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 combustible-dust classification calls for it — those are self-declarations of conformity, not third-party certifications. Our only third-party certification is ISO 9001:2015.
