Boiler-Feed and Slurry Pump Rebuild
A multistage boiler-feed pump and a slurry pump rebuilt cold to original clearances and lined, so both go back to service without new castings.
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
A multistage boiler-feed pump and a hard-working slurry pump both lost performance the same way. The volutes eroded, the wear rings opened up, and the flow paths roughened, so each pump moved less fluid for the same energy the plant put in. As the running clearances grew, more fluid slipped back inside the pump instead of leaving it, and the plant felt that as lost efficiency and higher energy draw. Both units kept getting pulled from the spares pool for repair, and the usual fix is a new casting, which carries cost and a long lead time the plant did not want to wait on.
The Belzona approach
Each pump comes into the shop for an assessment of where the metal has gone, separating the eroded volute and flow-path wear from the opened-up wear-ring areas. The casings and wear-ring areas are blasted back to clean, profiled substrate so the repair bonds, then Belzona 1000 Series composites rebuild the lost metal cold and the surfaces are reformed to the original clearances. With the profile back, an erosion-resistant coating lines the flow path, leaving a smooth hydraulic surface and tight clearances. Working cold means the casings see no heat distortion, and both pumps go back into service without waiting on new castings.
- Assess and measureBoth pumps are stripped and inspected, mapping the eroded volutes, roughened flow paths, and the wear-ring areas that have opened past their clearances.
- Surface preparationThe casings and wear-ring areas are grit-blasted back to a clean, profiled substrate so the rebuild composites and the lining bond to bare metal.
- Cold metal rebuildBelzona 1000 Series composites rebuild the lost metal, applied cold so the casings see no heat distortion.
- Reform clearances and lineThe volutes and wear-ring areas are reformed back to the original clearances, then an erosion-resistant coating lines the flow path for a smooth hydraulic surface.
- Return to spares poolThe clearances and finish are confirmed, and both rebuilt pumps return to the plant's rotating spares pool ready to run.
The result
- Eroded volutes and opened wear-ring areas rebuilt cold back to the original clearances
- Flow paths lined with an erosion-resistant coating for a smooth hydraulic surface and tight clearances
- Both casings saved rather than scrapped, so each pump returned to service without waiting on a new casting
- Pumps rebuilt and returned to the spares pool by factory-trained and factory-certified Belzona applicators
In the field
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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.