Equipment and parts for Koja / Koja Oy

Aerodynamic Calculation and Dynamic Balancing of Centrifugal Fans

Heavy-duty Koja / Koja Oy centrifugal process fans operating in power boilers and pulp and paper plants encounter intense aerodynamic and thermal loads. During initial commissioning or impeller replacement, technicians execute on-site precision dynamic balancing across two correction planes.

Real-time vibration velocity monitoring at bearing pedestals prevents shaft fatigue during thermal housing expansion. Selecting optimal backward-curved or radial blade profiles ensures maximum mechanical efficiency when moving particulate-laden hot gases at temperatures exceeding 1000 °C.

Blade Pitch Adjustment Protocol for Ecofan Axial Process Fans

Koja / Koja Oy Ecofan series axial process fans incorporate adjustable blade pitch mechanisms to match fluctuating aerodynamic system resistance. When conducting seasonal tune-ups or modifying process airflow volume, adjustments are carried out synchronously using the graduated hub dial.

Securing blade locking bolts with a calibrated torque wrench and safety washers eliminates blade shifting under high centrifugal acceleration. Verifying radial running clearances between blade tips and duct shrouds ensures uniform pressure and prevents rubbing under thermal growth.

Preventive Servicing of HIFEK and HIFEK ECO Industrial Roof Extractors

Continuous reliable operation of Koja / Koja Oy HIFEK roof extractors on plant buildings depends on weatherproof roof curb sealing and an unobstructed flow path.

Scheduled preventive maintenance entails removing grease and airborne particulates from the aluminum diffuser cowl and impeller to avert rotor imbalance. Maintenance personnel verify free movement of the gravity backdraft shutter to stop drafts and cold outdoor air backflow during shutdowns.

Testing electric motor winding insulation and clearing condensation drain ports protects unit durability in extreme climates.

Installation and Maintenance of Marine HVAC Vibration Dampers

Koja / Koja Oy Marine ventilation units withstand relentless structural vibrations from ship propulsion engines and vessel rolling motion. Specialized maritime rubber-metal dampers or spring isolators with mechanical limit stops provide reliable acoustic and vibration isolation.

Flexible high-temperature duct connectors constructed from flame-retardant fabric decouple air handlers from distribution ducts, keeping noise out of passenger cabins. Periodic inspection of AISI 316L stainless steel surfaces guards against pitting corrosion in saline ocean atmospheres.

Inspection Routine for Heavy-Duty Process Fan Bearings and Lubrication

Bearing assemblies in large Koja / Koja Oy process fans sustain severe radial and thrust forces while transmitting several megawatts of mechanical drive power. Regular tribological testing of grease or circulating lubrication oil identifies raceway flaking at the earliest developmental stage.

In split plummer blocks, engineers examine labyrinth and contact seals to prevent lubricant leakage and abrasive dust ingress. Regulating steady bearing temperatures via water or forced-air housing cooling eliminates thermal seizures and prevents catastrophic line halts.

Commissioning of Energy Recovery Systems in Future Air Handling Units

Energy conservation in central Koja / Koja Oy Future air handling complexes is driven by rotary and plate heat exchangers delivering energy recovery rates up to 85%.

To prevent frosting on exchange matrices during freezing winter conditions, the programmable controller monitors differential pressure and exhaust air temperature.

When aerodynamic resistance rises above normal thresholds, the control unit initiates an automatic defrost cycle via wheel speed modulation or face-and-bypass damper actuation. Fine-tuning mixing valve actuators maintains precise indoor climate parameters in cleanroom environments.