Moving cement, fly ash, polymer pellets, flour or pharma intermediates through pipework needs pressure rise that ordinary fans cannot reach. Conveying duty pushes into the 1,000–2,000 mmWC band — roughly twice typical ID/FD pressure — with abrasive solids in the gas stream and, often, combustible-dust classification. We build positive-pressure (push) and negative-pressure (vacuum) conveying blowers across the full envelope below.
A pneumatic-conveying blower is the prime mover of the line: developing the pressure rise that carries the solid, sustaining it against pipe, lift and bend losses, and surviving the abrasive material riding in the air stream.
Develop the pressure rise the line needs — typically 1,000–2,000 mmWC, well past the ~500 mmWC ceiling of an ordinary centrifugal fan.
Against the whole line resistance — pipe friction, vertical lift, bends and the receiving filter — across loadings from 5 to 100+ kg/kg air.
The conveyed material itself — cement, fly ash or pellets at heavy solids loading — and, where the dust is combustible, an ATEX Zone 22 atmosphere.
High pressure rise, abrasive solids in the stream, and combustible-dust risk drive the design. Get them right and the blower holds its duty point across a full conveying cycle. Size it like an ordinary fan and it stalls when the line empties, wears through in 12–24 months, or sits outside its ATEX classification.
Standard centrifugal fans tap out near 500 mmWC. Conveying needs 1,000–2,000 mmWC, occasionally higher — out of reach for a single ordinary wheel.
How we engineer it outTwo impellers in series in one casing, or a high-speed single stage at 2,950 RPM and above on a carefully balanced rotor — sized to the line, not pushed past its curve.
Cement, fly ash and pellets each scour the wheel and volute in their own way, throwing the rotor out of balance.
How we engineer it outHard-faced (chrome-carbide) impeller leading edges, AR400 wear plates on the high-velocity volute zones, and replaceable inlet cones — wear parts changed in place, not welded in.
Flour, sugar, biomass, polymer and aluminium powders form an explosive dust atmosphere — a Zone 22, sometimes Zone 21, classification the fan must sit inside.
How we engineer it outSelf-declared Zone 22 (Cat 3D) per 2014/34/EU: non-sparking impeller, bronze rub ring, bonded earthing, anti-static coatings and a defined T-class. Not a third-party certification.
We don't sell a catalogue near-fit. The blower is engineered to your material, conveying mode, loading and required pressure rise.
No catalogue fan forced onto your spec. Your operating point is engineered onto the best-efficiency region of the selected stage — wide enough to ride through an empty line and a choked line without stalling — then verified on the 200 HP VFD test rig before dispatch.
| Parameter | Standard | On application |
|---|---|---|
| Volume flow | up to 1,00,000 CMH (conveying duty is typically lower flow than ID/FD) | higher on enquiry |
| Static pressure | up to 2,000 mmWC single-stage; higher with two-stage | 3,000+ mmWC with custom multi-stage |
| Operating temperature | ambient to 80 °C (typical conveying air) | up to 200 °C for hot-process material conveying |
| Material loading | dilute up to 15 kg/kg; dense 15–100 kg/kg | higher dense-phase on enquiry |
| ATEX | Zone 22 (Cat 3D) self-declared for combustible materials | Zone 21 (Cat 2D) via Notified-Body partner |
| Drive power | up to 400 HP | higher with custom motor sourcing |
| Speed | 600–1,800 RPM typical; high-pressure single-stage to 2,950 RPM+ | per duty + sound limits |
| Balance quality | ISO 21940 G6.3 | G2.5 / G1.0 on application |
Bearing life is a L10h ≥ 40,000 h continuous design target, with pressurized oil lubrication on application for the largest dense-phase blowers. The envelope above covers the great majority of conveying duty; for pressure or loading beyond it, we engineer to spec and quote on enquiry. Material loading is mode-dependent — dilute phase runs 5–15 kg/kg at 18–30 m/s; dense phase runs 15–100+ kg/kg at 1–8 m/s.
The same engineering language carries from your enquiry to the GA drawing to the nameplate — expressed in the standard AMCA conventions.
| Specification field | Options |
|---|---|
| Arrangement (AMCA 99) | Arr. 1 (overhung, fan bearings) / Arr. 4 (direct, motor on base) / Arr. 8 (overhung on common base) / Arr. 9 (overhung, motor side) / Arr. 10 (overhung, motor inside base) — selected by drive, access and pressure class. |
| Stage / inlet | Single-stage SWSI (single width, single inlet) to ~1,500 mmWC; two-stage in series in one casing for 2,000+ mmWC dense-phase duty. |
| Wheel type | Backward-curved (default, best efficiency, clean-dust) / radial-tipped self-cleaning (sticky or accumulating material) / high-speed single-stage (maximum pressure rise). |
| Class (by pressure / outlet velocity) | Class II / III selected from the duty point on the pressure-vs-outlet-velocity limits; conveying duty sits high on the pressure axis, so heavier construction is the norm. |
| Materials of construction | MS + AR400 with hard-faced wheel (cement / fly ash) / 304 SS food-grade (flour, sugar, spices) / 316L or Hastelloy (pharma, corrosive intermediates) / aluminium wheel with anti-static (combustible biomass and powders). |
| Drive | Direct-coupled / V-belt / VFD (default, so the operating point holds through an empty or choked line). Drive up to 400 HP; coupling service factor 1.5 minimum for the high-torque high-pressure load. |
| Discharge & rotation (AMCA orientation) | Rotation CW or CCW (viewed from drive side) with discharge angle per AMCA — e.g. TH/BH/UB/DB — set to match your conveying-line take-off and installed footprint. |
| Accessories & ATEX scope | Inlet/outlet silencers (high-pressure conveying runs noisier than FD duty); labyrinth or mechanical-contact + gas-purge shaft seal; bolted-and-gasketed pressure-rated access doors and inlet cone; AR400 wear plates; ATEX package — non-sparking impeller, bronze rub ring, bonded earthing, anti-static coating, T-class — where the dust is combustible. |
Every job's performance is verified at our works on the 200 HP VFD test rig, to the AMCA 210 / ISO 5801 method, before dispatch.
Cement, fly ash, raw meal and clinker dust to silo and through transfer lines.
Fly ash to silo, bottom ash, and fly ash to disposal.
Flour, sugar, salt, spices, milk powder, infant formula and cocoa — food-grade, ATEX.
APIs, excipients, granulation feed and dispensing-line transport — sanitary, CIP-ready, ATEX.
Pellets, regrind, powder feedstock and masterbatch — pellet impact and attrition control.
Pigments, dyes, fertiliser intermediates and polymer powders — corrosion plus abrasion.
Aluminium powder, slag dust and refractory fines — severe combustible-dust risk.
45 application/duty types engineered, across 30+ industries. Tell us yours.
What our marks mean, in the words that survive an audit.
Tested to the AMCA 210 / ISO 5801 method, in-house on our 200 HP VFD rig. Tested-to-method — not AMCA-certified.
ISO 9001:2015 — third-party certified. Our only third-party certification.
Self-declared per 2006/42/EC + 2014/35/EU (Module A). A self-declaration, not a notified-body certificate.
Self-declared, Zone 2/22, Category 3, per 2014/34/EU, where the area classification calls for it.
Designed and built to API 673 as project-specific scope.
ASME Sec IX qualified welders + WPS for every joint.
ISO 21940 — G6.3 minimum, G2.5 / G1.0 on application.
ISO 20816 evaluation; ISO 14694 for fan-specific limits.
| Stage | Standard duty | API-673 / engineered |
|---|---|---|
| Offer / quotation | 3 working days — always | 7–10 working days |
| GA drawing for approval | 2–3 weeks from PO | 3–4 weeks from PO |
| Manufacture + balance + paint | 6–10 weeks | 10–14 weeks |
| Performance test + witnessed FAT | ~1 week | 1–2 weeks |
| Order-to-dispatch (total) | 9–14 weeks | 14–20 weeks |
Shutdown-driven replacements: we have shipped fans within 6 weeks of a clean PO. Tell us your shutdown window and we commit to a dated plan.
The same engineering, viewed three ways — by fan family, by duty, and by industry. Follow the cross-references.
No model numbers needed. Give us the operating conditions — flow, static, gas temperature, composition, particulate, and any tender standard — and our application engineers size the fan and quote it. Attach a spec or GA if you have one.
+91 90110 09155 · mihir.jitamitra@gmail.com