We repair, refurbish, re-rate and re-part centrifugal fans and blowers — regardless of who built them — in our shop or in your plant. Shafts, bearings, impellers, hardfacing and drop-in spares, with every rotor re-balanced to ISO 21940 before it ships.
Most fan makers will only touch their own machines. Jitamitra's aftermarket business is built the other way round: we repair, overhaul, hardface, re-impeller, retrofit and re-part any make of centrifugal fan or blower — OEM, competitor, obsolete or orphaned. When a worn wheel has no drawing, we reverse-engineer it from the part itself and supply a drop-in replacement that fits the original casing and shaft.
Every job runs on the same fan engineering we use to build new machines: rotors re-balanced to ISO 21940 (G6.3 general, G2.5 for critical and API service), in-situ vibration judged to ISO 20816, and chromium-carbide weld overlay for abrasive duty. Work happens in the shop or in the field, and where the honest answer is "rebuild, not replace" we say so — with costed options, expected downtime and payback, so the decision rests on facts rather than a sales pitch.
Shop or field repair and overhaul of any make of fan: shaft, bearings, housing, NDT crack checks, re-balance.
Standard/method. ISO 1940 / ISO 21940 (re-balance grades G6.3, G2.5); ISO 20816-3 (in-situ vibration acceptance limits, mm/s RMS); dye-penetrant NDT used in-house (full UT / MT / RX menu vendor-routed). Where API-class documentation is required it follows API 673 balance and inspection expectations.
Armour the surfaces that erode first — impeller blades, backplates and casing scroll/inlet — with our in-house FCAW chromium-carbide weld overlay at 55-60 HRC, or with carbide cladding, ceramic/rubber lining and replaceable wear plates matched to the duty. Blades are resurfaced or replaced past 20% wear, and any rotor work is re-balanced to ISO 21940 (G6.3/G2.5) before return. Available on any make.
Standard/method. ISO 1940 / ISO 21940 (re-balance after rotor work, G6.3 general / G2.5 critical). Hardfacing hardness benchmarked to industry overlay practice (house 55-60 HRC; industry 55-65 HRC). No accredited weld-procedure certification is claimed beyond the house FCAW practice - quoted on enquiry.
Reverse-engineer, redesign and supply a drop-in replacement impeller for a fan of any make.
Standard/method. ISO 1940 / ISO 21940 (balance quality grades G6.3, G2.5 for the new rotor); material selection cross-referenced to airstream corrosion / abrasion practice. Where the wheel feeds an API-class fan, balance to G2.5 per API 673 / ISO 21940.
Survey the installed fan and its system, then re-engineer the impeller and internals to a new duty — more flow, pressure or efficiency — while reusing the existing casing and foundation. We add the AMCA 201 system-effect factor before re-rating, target the operating point near best efficiency, and balance the new rotor to ISO 21940 (G6.3/G2.5) against an AMCA 210 / ISO 5801 basis. Available on any make.
Standard/method. AMCA 201 (Fans and Systems - system-effect factors applied before re-rating); ISO 1940 / ISO 21940 (re-balance the new rotor to G6.3 general, G2.5 critical); AMCA 210 / ISO 5801 (performance basis for the re-rated duty). Density-correction and fan-law basis per standard-air reference. Where field verification is provided, it follows AMCA 203 / ISO 5802 field-test method.
Inspect the fan against hard failure criteria — 20% blade erosion, hub/root cracks, bearing and casing condition, duty drift — then lay out costed repair, retrofit and replacement options side by side, each with expected downtime and payback. You get a documented, decision-framed report grounded in the same selection and maintenance engineering we use to service fans, not a sales pitch. Make-independent.
Standard/method. Recommendations reference the same standards as the follow-on work: ISO 21940 / 1940-1 balance grades, ISO 20816-3 vibration acceptance, AMCA 210 / ISO 5801 performance basis, and Jitamitra's maintenance manual wear / replacement criteria. No certification is implied by the advisory itself.
Put our fan machine-shop and fabrication floor to work on your non-fan parts — shaft salvage and re-machining, general turning, boring, milling and steel fabrication — quoted as a standalone third-party job. Rotating parts can be supplied balanced to ISO 21940 (G6.3/G2.5) where required, machined to your drawing tolerances. Offered against genuine spare capacity, so we confirm a realistic date with each quote.
Standard/method. ISO 21940 / ISO 21940 balance grades (G6.3 / G2.5) apply where a machined rotating part must be supplied balanced. General machining tolerances are per customer drawing. No fan-specific certification applies to non-fan job-shop work - engineered to drawing / on enquiry.
Supply the wearing and replacement parts of a centrifugal fan — impellers, shafts, bearings, inlet cones — for any make of fan, not only ours, identified from the nameplate and drawings or by reverse-engineering the worn part when no drawing exists. Replacement impellers are balanced to ISO 21940 (G6.3 general, G2.5 for API / critical service) before dispatch, and we build you a recommended-spares list so a breakdown becomes a shelf swap, not weeks of downtime. One source for a mixed fleet, obsolete and orphaned fans included.
Standard/method. ISO 21940 / 1940-1 balance quality grades for replacement impellers (G6.3 general, G2.5 API / critical). Bearing replacement and lubrication practice per Jitamitra's maintenance manual. No further external certification is implied by parts supply itself.
Flow, static, gas temperature, application — or attach a spec, GA drawing or a multi-fan schedule. Engineer to engineer.
ISO 9001:2015 quality system · performance-tested to IS 4894 / ISO 5801 / AMCA 210 method · witnessed FAT on request, at no cost.
*For our standard range, additional days required for special projects
