Field Balancing of Fans and ID Fans in Metallurgy and Power Plants | KEG TRK

⚠️ EN version — draft. Ready to publish once kk/en routing (i18n) is implemented across the site.

Rotor unbalance is a leading cause of bearing overload on auxiliary fans and ID fans. At metallurgical and power sites it usually builds over weeks from dust, scale and condensate on blades — or after repair with partial blade replacement.

Field balancing in own bearings brings residual unbalance within spec without rotor disassembly — typically in a 4–8 hour planned window.

Site specifics

Metallurgy: abrasive hot gas deposits on wheels; after cleaning, balance is almost always required. Blast furnace and converter ID fans at 400–1200 rpm generate high centrifugal force from small residual unbalance.

Mining: ventilation and concentrator fans — seasonal ice and wet ore buildup on blades.

Power: PA/FD fans and cooling tower fans — post-overhaul balance needed after welding, blade work and site dirt.

When balancing helps — and when it does not

Appropriate if rotor is sound, bearings tight, alignment is acceptable, cause is mass (deposits, lost tip, uneven wear).

Not appropriate for cracked blades, loose wheel nut, bearing clearance, resonance, or deposits forming faster than correction.

Protocol

Inspect → clean wheel → vibration sensor + tachometer → initial run → trial weight → correction mass → verification → ISO 21940 report (typically G 6,3 or G 2,5).

Long ID fan rotors need two-plane balancing; compact PA fans often one plane at the wheel.

Integration

Balance works with alignment, oil analysis and thermography in the four-method PdM program.

KEG TRK performs field balancing of fans, ID fans and conveyor drums at metallurgical, mining and power sites — with ISO documentation.

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