Pump Group Use Belzona to Repair 12m Screw Feeder

Pump Supply & Repair Group arranged transport of the 12m Screw Feeder from an EON Power Station Site. The unit was taken out of service because of extensive wear to flights & central tube.

Non Destructive Testing was carried out on the flights, the shaft and the teeth. Ultra sonic testing determined the thickness of the worn 304 Stainless Steel Lining, and MPI Testing (Magnetic Particle Inspection) was used to identify cracks in the surface. In total, 326 faults were detected that required welding along the face of the screw, and in several areas the steel lining had worn down to less than 3mm thickness. The cracks were welded using hard face SS2333 rods to prevent future cracking. The teeth were substantially worn and several teeth were missing. All the teeth were removed and new teeth were welded on with 304 SS rods. The teeth were hard face welded on 2 sides using MAC Hard E306 rods to further increase their abrasive resistance.

The 10 ton screw was then grit blasted to SA 2.5 @ 75 microns to ensure correct surface profile for Belzona application.  Belzona 1812 Ceramic Carbide was applied to 15mm on the wear pads on the flights to build up to original thickness. Belzona 1812 was then applied at a thickness of 4mm to the shaft and all working faces of the screw & flights.

The total job turnaround of the screw was 10 weeks from the go-ahead to completion.

For more information on how Pump Supply & Repair Group can utilise our Belzona facilities and expertise, please contact our Operations Director, Martin Cooper on 0161 864 4678 or via email at mcooper@pumpgroup.co.uk