ID Fan Blade and Housing Erosion Lining
Eroded ID fan blades and scroll rebuilt cold and erosion-lined to bring the rotor back toward balance and restore airflow.
A job completed with Belzona. This describes what the Belzona system does and how it goes on, not a record of a specific project by this distributor.
The challenge
An induced-draft fan pulls ash-laden gas across its blades and through its housing, and that ash grinds the metal away over time. The leading edges of the blades thin out, the wear faces lose profile, and the scroll roughens where the gas scours it. As metal comes off unevenly, the rotor falls out of balance, which loads the bearings and shakes the whole assembly. At the same time the roughened, reshaped flow path moves less gas for the same fan speed, so the unit loses the airflow it needs. Left alone, the imbalance and the lost draft only get worse as the ash keeps cutting.
The Belzona approach
The rotor and the housing come down for a close look at where the ash has cut the metal, with attention on the blade leading edges and the scroll. The blades and the housing are stripped back to clean, profiled metal so the repair has something to grip. Belzona 1000 Series composites then rebuild the lost leading-edge and wear-face metal cold, putting the profile back without any welding or heat into the blades. Once the metal is back, an erosion-resistant lining goes over the blade faces and across the scroll so the new surface stands up to the ash. The rebuilt edges and the smooth lining bring the rotor back toward balance and open the airflow path the fan needs to do its job.
- Assess the wearThe rotor and housing are inspected to map where the ash has thinned the leading edges, worn the blade faces, and roughened the scroll.
- Strip to clean metalThe blades and the housing are grit-blasted back to clean, profiled steel so both the composite and the lining bond to bare metal.
- Rebuild the edges coldCold-applied composites rebuild the lost leading-edge and wear-face metal, restoring profile with no welding or heat into the blades.
- Line the blades and scrollAn erosion-resistant lining goes over the blade faces and across the scroll to give the gas a smooth surface that resists the ash.
- Balance and return to serviceThe rebuilt rotor and housing go back so the unit runs closer to balance with the airflow path restored.
The result
- Eroded leading edges and wear faces rebuilt cold, with no welding or heat into the blades
- Blade faces and scroll lined with an erosion-resistant surface that stands up to ash instead of being ground away
- Rotor brought back toward balance and the airflow path restored, easing load on the bearings
- Repair carried out by factory-trained and factory-certified Belzona applicators
In the field
More Power Generation projects
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Turbine Pedestal Chocking and Grouting
Load-bearing chocks cast in place under a turbine baseplate that had lost foundation contact, restoring full support and alignment.
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Belzona Houston is the authorized Belzona distributor for South Texas and the Gulf, based in Alvin, Texas, we’ll survey your equipment and recommend the right cold-applied Belzona system, with 24-hour support.