Can you supply the fans across the whole fertilizer flowsheet, or only one duty?
Across the whole flowsheet. We engineer the prilling-tower and dryer air, the ammonia and acid-gas exhaust, granulation and product-dust extraction, dilute-phase pneumatic conveying, combustion and process air, and general dilution ventilation. Each fan is engineered to its own gas, metallurgy and dust load — the corrosive-gas exhaust and the clean dryer fan are different machines — but they come from one partner, on one engineering convention across the plant. We have executed a handful of fertilizer duties, and the underlying corrosion-and-wear fan engineering is proven right across our range.
Our gas is ammonia- and acid-laden. What metallurgy do you use?
We size the metallurgy to your gas analysis. 316L is our default on the wetted surfaces where the gas turns ammonia- or acid-laden, and we step up to duplex or higher alloys on aggressive gas. Where the chemistry calls for it we build in FRP or PP. Ammonia can stress-corrosion-crack the wrong alloy, so we select material to avoid that trap, and where the gas drops below the acid dew point (typically 120 to 150 °C) we hold the casing wall above dew point with insulation and heat tracing. The right answer depends on your ammonia, fluorine, SO₂/SO₃ and moisture, so we engineer it to your gas, not a default.
Fertilizer dust is hygroscopic and cakes on the wheel. How do you handle that?
Urea, DAP and NPK dust absorbs moisture and cakes the moment the salt-laden air cools toward the casing wall, and the deposit builds asymmetrically and unbalances the rotor. We handle it three ways. Blade geometry chosen so salt does not key onto the wheel; the casing wall held warm with insulation and heat tracing so the dust stays dry and mobile; and wash-in and cleaning connections with large access doors so the wheel is cleaned in place. After cleanout the rotor is re-balanced to ISO 21940 G6.3, so caking does not become a chronic vibration problem.
The granulation and conveying dust is abrasive. How do you protect the wheel and casing?
Prilled and granular salt is hard, so we protect three ways sized to your loading. A rugged radial wheel that sheds dust and resists erosion; 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 dust-extraction and pneumatic-conveying fans running between overhauls.
Can you build a replacement to match our existing fertilizer fan's duty and footprint?
Yes. We reverse-engineer to the existing duty point (flow, static pressure, gas temperature, density, gas chemistry 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 prilling fan, a scrubber-exhaust fan, a dryer fan or a dust-extraction 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 — and we confirm the metallurgy against your current gas analysis rather than copying the old material blindly.
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; 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.
