Why replace when it's more cost effective to refurbish?
Is your grit rake at the end of life, does it have major failings, is it out of commission? You could replace with a new system but you could also refurbish @ circa 30% of new system price.
Generally grit rakes that have been in service for many years require a significant amount of refurbishment due to a combination of heavy corrosion, structural fractures and some original manufacturing defects. Rectification of these deficiencies is made more challenging by the unavailability of any sort of original equipment drawings and in some places absence of the component itself due to corrosion.
Weakened or broken structural members can be cut out and replaced with material of the same or an improved specification. Corroded and worn scraping blades can be removed along with their fasteners and replaced with new. Replacement inspection cover and hinges are designed and fabricated to suit. Porous blade carrier welds are ground out and rewelded. Mounting plate pins and bushes suffering from extremely heavy wear, with pins being significantly stepped are repaired or reverse engineered.
Replacement Bronze (LG2) bushes and Steel (EN24T) pins are designed and machined, complete with grease lubrication passages. Main drive crank bushes, shaft and pins are replaced and were necessary designed by reverse engineering the existing worn parts and then machined from solid, matching or exceeding the original equipment manufacturers specifications. The Crank linkage connection tube can suffer from corrosion in places and these areas are cleaned down to bare metal and returned to original dimensions by welding. Once repairs are complete, items are blasted and coated to WIMES specification.
Cleaning, inspection & coating
Before an accurate evaluation can take place the grit rake has to be removed and cleaned. The cleaning process includes jet washing, grit blasting and steam cleaning. All blast cleaning complies with WIMES specification. The inspection identifies corrosion, structural soundness and any original manufacturing defects. The final stage of refurbishment is the application of a heavy duty corrosion resistant coating which is applied to WIMES specification.
Component refurbishment & re-engineering
Lever mechanism – after cleaning the unit it is stripped and inspected, and surface cracks or corrosion would be repaired. If required new bearing bushes would be fitted and shafts remanufactured or reverse engineered with new components, equal to or better than original specification.
Scraper blades are steam cleaned, grit blasted and surface repairs carried out where necessary to restore to original geometry then blast cleaned again prior to new surface coating to WIMES specification with new fittings supplied where required.
Following the cleaning and strip down, the bearing housing, pulley mechanism and belt drive etc. are inspected and either replacement or repaired components made where necessary. New guard is provided if required. Coatings to WIMES specification is completed prior to reassembly.
After steam cleaning the impeller, shaft and drive head is inspected for corrosion and structural soundness. The impeller is blast prepped to SA2.5, pre heated and coated with a high performance, hydrophobic, 2 part epoxy coating that has excellent erosion and corrosion resistant properties.
Throughout the refurbishment process it’s often necessary to replace small parts that have either corroded or are missing. Replacement parts are designed by reverse engineering from existing
For quotation requests and site survey please contact firstname.lastname@example.org.